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1. Diameters can be entered as decimal or fractional values and explicit units of measure for inches feet millimeters mm centimeters cm and meters m can be appended to data If the unit of measure is not specified the current default Length Units setting on the Units page of the Model Info dialog will apply Enter Parameters for Round Name From Diam 1 2 To Diam 1 4 Path Position center 2 Sides 12 Cancel 04 4 Figure 3 9 Example Input Dialog for Round Taper Establishing the from end of the taper and the position of the path relative to the taper is accomplished as described in the Section 3 1 above As when drawing a circle in SketchUp Taper Maker needs to know how many sides straight line segments to draw to approximate the circle A larger value for Sides will improve Taper Maker s approximation of a circular cross section but this will come at the cost of making the model larger and more complex and of taking longer to draw 3 4 HEXAGON Data for a hexagonal taper is very similar to that entered for a square or round taper The dimension of a hexagon is given by the distance from one flat side to the opposite flat side across flats or AF The dialog box prompts you to enter the value for the From AF and To AF 3 5 DISPLAY TAPER DATA Taper Maker writes the input parameters used to create a taper as SketchUp attributes of the
2. Units page of the Model Info dialog will apply Naming the taper is optional is replaced by two corners connected by a line Figure 3 4 gives an example of a Square taper with and without a bevel angle of 8 0 Bevel angle measures the circular angle between the two points that replace the corner in the taper profile Using bevel angles increases the size and complexity of the drawing and significantly increases the time required to draw Bevel angle is not considered in estimating stock requirements Figure 3 4 A Taper Without and With Beveled Edges Data for a diamond shape is entered as if for a square but the square shape is rotated 45 degrees when drawn Once the data have been entered Taper Maker will ask you for more information on how to draw the taper Because the from and to ends of a path are arbitrary Taper Maker draws a sample cross section using the from dimension at one end of the path and the to dimension at the opposite end of the path and asks you to verify that the sample is correctly positioned with respect to the from and to ends If you click No the opposite ends of the path become the from and to ends This interaction is illustrated in Figure 3 5 SketchUp Are the from green and to red cross sections at the correct ends of the path SS SS mv Cancel No Yes Figure 3 5 Dialog to Establish the From and To Ends
3. This enables you to activate or deactivate each plugin independently in the Extensions section of SketchUp s Preferences dialog That is the plugin submenus will appear on SketchUp s Plugins menu only when they are activated If for example you only want to use the Taper Maker plugin you can deactivate the Curve Maker and Stock Maker plugins uncheck the appropriate check boxes after installing them 3 0 TAPER MAKER Taper Maker tapers one of several pre defined cross section shapes face profiles along the length of a path line Figure 3 1 shows a square cross section that is 1 x 1 at the start of a spiral path and tapers to 1 4 x 1 4 at the end The currently available cross section shapes include square diamond rectangle hexagon octagon and round Figure 3 1 A Taper Created by Taper Maker Before drawing a taper you must first select a connected path of edges along which the taper is to be constructed Next choose the Draw a Taper option from the Taper Maker submenu on SketchUp s Plugins menu Plugins gt Taper Maker gt Draw a Taper The dialog box in Figure 3 2 will appear Enter Values Options Cancel OK Figure 3 2 Initial Draw a Taper Dialog Select the desired section taper shape from the drop down list Options are well optional see Section 3 7 below Click OK Valid taper shapes are square diamond rectangle hexagon octagon or round A se
4. SketchUp plugins The following instructions assume that you have already installed SketchUp on your computer SketchUp is available on the internet at http Sketchup google com download html Step 1 If you want to use all three plugins copy the following files into SketchUp s Plugins folder curve_maker rb taper_makerrb stock_makerrb If you do not want to use one of the three plugins e g Curve Maker you can either a not copy the appropriate rb file e g curve_maker rb into the plugins folder or b you can deactivate the plugin as described below Step 2 Create a subfolder named ctsMaker in the Plugins folder and copy the following files into the ctsMaker subfolder ctsLangEN strings ctsMaker rbs curve_menu rb taper_menu rb stock _menu rb On Mac OS X SketchUp s Plugins folder is a subfolder of MacintoshHD gt Library gt Application Support gt Google SketchUp 6 gt SketchUp On Windows 2000 XP SketchUp s Plugins folder is a subfolder of C Program Files Google Google SketchUp 6 If SketchUp is running when you install the plugins you must quit SketchUp and restart it SketchUp cannot load plugins dynamically It is only aware of whatever plugins are in the Plugins folder when it starts up It does not become aware of plugins whenever they are added to the Plugins folder Once installed and SketchUp is restarted the plugins register themselves with SketchUp
5. data values that direct Curve Maker to create an Archimedean spiral are entered via the dialog box shown in Figure 4 5 above Turns data and radius length can be entered as decimal or fractional values For radius lengths you can append explicit units of measure for inches feet millimeters mm centimeters cm and meters m to the data value If the unit of measure is not specified the current default Length Units setting on the Units page of the Model Info dialog will apply The Sides Turn parameter works the same as described for Bernoulli spirals Curve Maker will draw each full turn using the number of sides you specify and draw a line segment for each side The larger the number of sides the better the approximation of the curve but the larger the number of elements in the SketchUp model 4 3 SINE AND COSINE WAVES One complete cycle of both a sine wave and a cosine wave are illustrated in Figure 4 7 VV Figure 4 7 One Complete Cycle of a Sine Wave and a Cosine Wave below Curve Maker draws sine and cosine waves to fit inside a rectangular space specified by the user In addition Curve Maker will draw a complete cycle or only a portion of a cycle For example Figure 4 8 below shows the middle one half of a sine wave cycle that fits within a rectangle 3 wide and 2 high Figure 4 8 Middle Half of a Sine Wave Cycle To draw a sine or cosine wave Curve Maker needs to know a how much of
6. estimated stock requirement for a single taper In this example 7 1 8 of 1 square stock is estimated to provide sufficient volume to make the 16 5 16 finished taper Example ta From 1 x Stock Length 7 1 8 Figure 1 3 Stock Requirement Estimated Using Stock Maker Figure 1 4 displays accumulated stock requirements for twelve tapers assigned to three stocks made from two alloys Alloy A36 A36 T 304 T 304 1 4 T 304 1 4 15 r r ik 1 1 2 172 Stock sq ms sq ms sq ss sq 5 sq ss sq ss Taper Name Vertical Large Scroll Small Wave Count 5 Total Total Total Total Total Stock Requirements Taper Length 24 120 27 1 4 81 3 4 10 3 8 41 7 16 123 1 8 243 1 8 Taper Weight Stock Length 9 7 8 49 5 16 8 3 8 25 1 8 3 9 16 14 1 4 Stock Weight Figure 1 4 Accumulated Stock Requirements Figures 1 5 1 6 and 1 7 provide additional examples where these plugins have been used Figure 1 5 Grill After Albert Paley ERN Figure 1 6 Gate 2006 Hammerfest Forge All rights reserved Used by permission of Hamerfest Forge Figure 1 7 Stair Railing 2007 Hammerfest Forge All rights reserved Used by permission of Hamerfest Forge 2 0 INSTALLATION Taper Maker Curve Maker and Stock Maker are installed in the same manner as other
7. group it creates These data may be viewed by using the Display Taper Data option from the Curve Maker submenu Plugins gt Taper Maker gt Display Taper Data The attribute values will be displayed in a dialog box and you will be given the option to have the data written in a SketchUp text box Example attributes are shown in Figure 3 10 SketchUp Example From 1 x 1 To 1 4 x 1 4 Length 16 11 32 Volume 7 141cu Stock 1 sq ss Stock Length 7 5 32 Write values in a text box No Yes Figure 3 10 Taper Data Display Dialog If you elect to have the attribute values written in a text box the text will be written at the center of the taper You can then move it to a more convenient position in your model and or assign it to a different layer In addition to input data Taper Maker will save some computed values as attributes This includes the length of the taper and data relating to the stock required to make the taper provided a stock has been assigned as described below The length of a taper is always computed along the center line of the taper If you explode a taper group the taper attributes will be lost and cannot be displayed again You will have to recreate the taper and reassign a stock to recreate the data Similarly if you use a SketchUp tool to resize a taper the attributes will Figure 3 11 Taper Data in a Table The text table will app
8. into a text box If you elect to have the attribute values written in a text box the text will be written at the center of the selected tapers You can then move the text to a more convenient position in your model and or assign it to a different layer As illustrated in Figure 5 8 there will be subtotals for each stock assigned to the tapers subtotals for each alloy used and overall totals for length weight and cost Alloy A36 A36 T 304 T 304 T 304 T 304 T 304 1 1 11 1 2 1 2 Stock sq sq sq sq sq sq Taper Name Vertical Large Scroll Small Wave Count 5 Total 3 Total 4 Total Total Total Stock Requirements Taper Length 24 120 27 1 4 81 3 4 10 3 8 41 7 16 123 1 8 243 1 8 Taper Weight 2 66 13 3 7 88 21 18 Stock Length 9 7 6 49 5 16 8 3 8 25 1 8 3 9 16 14 1 4 Stock Weight 22 24 Figure 5 8 Accumulated Stock Requirements Stock Cost 2 66 13 3 12 87 38 61 44 85 58 15 Loss Pct 5 0 The text table will appear well formatted if the Leader Text option on the Text page of the Model Info dialog is set to a non proportional font such as Courier The data in the text box can be copied and pasted into another software applications Such as a spreadsheet or word processor
9. the length of the stock unit These data are entered ina dialog box Dimensions for the cross section shape are specified in terms of thickness vertical dimension and width horizontal dimension The data in Figure 5 2 define a stock unit as a 12 mild steel bar with a 1 2 x 1 rectangular cross section Enter Parameters for Rectangle Name Alloy TxW Unit Length Unit Weight Unit Cost Cancel 1 2 x lms A36 1 2 x 1 12 1 704 1 83 Figure 5 2 Example Input Dialog for Rectangle Stock Unit Figure 5 2 also illustrates that Stock Maker accepts information on the weight and cost of the unit When a stock unit is assigned to a taper the weight and cost of the taper is computed as part of the estimating process and assigned as SketchUp attributes of the taper After you click OK Stock Maker draws the stock unit A stock unit can also be assigned a SketchUp material Figure 5 3 illustrates the stock unit drawn from the parameters in Figure 5 2 and colored a dark grey When a stock unit is assigned to a taper the SketchUp material for the taper will be the same as the assigned stock 5 3 SELECT STOCKS BY ATTRIBUTE Stock Maker will select stocks it has drawn that have a particular attribute To select stocks by attribute use the Select Stocks by Attribute option from the Stock Maker Submenu Plugins gt Taper Maker gt Select Stocks by Attribute
10. the options field Curve Maker will give you the option to read the curve specification data from a txt file and if you change any of the data values save the changes to a file 4 1 BERNOULLI LOGARITHMIC SPIRALS AND THE GOLDEN SECTION SPIRAL In a Bernoulli spiral the radial distance from the spiral s origin to each point on the spiral increases multiplicatively As shown in Figure 4 3 below the rate at which the radial distance increases characterizes the shape of the spiral Because of this characteristic Bernoulli spirals are sometimes referred to as growth spirals Figure 4 3 Two Bernoulli Spirals To draw a Bernoulli spiral Curve Maker needs to know a how much of the spiral you want drawn and b how fast you want the spiral to grow How much you want to draw is expressed in terms of the number of turns complete revolutions you want the spiral to make around the origin How fast you want the Bernoulli spiral to grow is expressed in terms of the distance the curve should be from the origin at any two points on the spiral including points outside the range to be drawn To understand turns consider the rotating hands of a standard clock Zero turns corresponds to 3 o clock Rotating counter clockwise corresponds to making positive turns spiraling out For example rotating counter clockwise from 3 o clock to 9 o clock corresponds to making a positive one half turn Continuing to rotate counter
11. Taper Maker Curve Maker and Stock Maker Plugins for SketchUp Users Guide Version 1 03 August 2008 Copyright 2007 2008 G Terry Ross Draw Metal LLC All rights reserved SketchUp is a registered trademark of Google Inc www drawmetal com 1 0 INTRODUCTION Taper Maker is a SketchUp plugin a Ruby script that tapers a cross section shape along the length of a line Taper Maker was motivated by the desire to draw curved tapered elements for architectural ironwork design Figure 1 1 shows several examples created by Taper Maker Figure 1 1 Example Tapers Two additional tools complement Taper Maker The first tool Curve Maker draws one of several pre defined curves To facilitate fitting an element into a design Curve Maker allows you specify the size of the curve instead of parameter values for mathematical equations Figure 1 2 shows a Spiral path created from the two dimensions shown in the figure Figure 1 2 An Example Spiral The last tool Stock Maker manages units of stock from which tapers may be made For example a stock unit might be defined as a 1 square stainless steel bar of a given weight length and cost Once a taper has been created using Taper Maker a stock unit can be assigned to the taper and Stock Maker will estimate how much of the stock is required to create the taper Stock Maker will also accumulate estimates of stock requirements across multiple tapers Figure 1 3 illustrates the
12. The dialog box in Figure 5 4 will appear Choose Attribute and Specify Value Attribute Alloy I Value Cancel 4 OK 4 Figure 5 4 Select Stocks by Attribute Dialog Box Select an attribute of a stock from the drop down list in the Attribute field and a value for the attribute in the value field Currently available attributes are Section a stock cross section and Alloy a stock alloy The dialog in Figure 5 5 selects all stocks in the model made from the alloy A36 mm Choose Attribute and Specify Value Attribute Alloy i Value A36 7 Cancel OK Figure 5 5 Example Select Stocks Dialog Box 5 4 ASSIGN STOCK TO SELECTED TAPERS To assign a stock unit to a taper first select the taper s and then choose the Assign Stock to Taper option from the Stock Maker submenu Plugins gt Stock Maker gt Assign Stock to Selected Tapers or from the Taper Maker submenu Plugins gt Taper Maker gt Assign Stock to Selected Tapers When a stock is assigned Stock Maker estimates the amount of the stock required to produce a taper volume For each taper in your selection the dialog box in Figure 5 6 will appear Assign Stock To Example taper Stock 1 sq ss Cancel 3 OK 3 Figure 5 6 Assign Stock to Taper Dialog Box Select the name of the stock that you want to assign to the taper from the list of stocks in the drop down list All stocks defined fo
13. a cycle you want it to draw and b the width and height of a rectangle in which to draw the cycle or portion How much of a cycle you want to draw is expressed as starting and ending points fraction of a complete cycle The number 0 denotes the beginning of a cycle and the number 1 denotes the end of a cycle Fractional values between O and 1 correspond to points between the beginning and the end of a cycle The data values that directed Curve Maker to create the middle half of the sine wave shown above were entered via the dialog box shown in Figure 4 9 below The width and height of the surrounding rectangle are also specified in the dialog Enter Parameters for Sine Name From cycle 1 4 To cycle 3 4 Height 2 Width 3 Sides Cycle 36 Cancel OK 3 Figure 4 9 Sine and Cosine Wave Dialog Box The input data are the same for both sine waves and cosine waves Cycle data and lengths can be entered as decimal or fractional values For Height and Width you can append explicit units of measure for inches feet C millimeters mm centimeters cm and meters m If the unit of measure is not specified the current default Length Units setting on the Units page of the Model Info dialog will apply Sides Cycle is the number of line segments that are drawn when a complete cycle is drawn 4 4 THREE DIMENSIONAL CURVES As described above the points that define the Ber
14. clockwise to complete one positive turn gets back to 3 o clock Similarly one and one half turns Consider the spiral in Figure 4 4 It is drawn from 1 4 turns to 1 3 4 turns At 1 turn the radius is 2 and at 1 1 2 turns the radius is 5 Figure 4 4 Bernoulli Spiral The data values that direct Curve Maker to create this spiral are entered via the dialog box Shown in Figure 4 5 below Notice that turns data and radius values can be entered as decimal or fractional values For radius values explicit units of measure for inches feet millimeters mm centimeters cm and meters m can be appended to data If the unit of measure is not specified the current default Length Units setting on the Units page of the Model Info dialog will apply Enter Parameters for Bernoulli spiral Name From turns 1 4 To turns 1 3 4 lst Radius 2 lst Turns 1 2nd Radius 5 2nd Turns 1 5 Sides Turn 36 7 Cancel OK gt Figure 4 5 Bernoulli Spiral Dialog Box Because curved lines are approximated in SketchUp by a series of edges straight line segments Curve Maker lets you control the approximation through the Sides Turn parameter This is very similar to the sides parameter used in drawing circles in SketchUp Curve Maker will draw each full turn using the number of sides you specify and draw a line segment for each side The larger the number of si
15. cond dialog box will open prompting you for input data appropriate for the taper Shape selected in the first dialog box Those inputs are described in detail below 3 1 SQUARE AND DIAMOND Taper Maker needs to know the dimension thickness width of the square cross section at the beginning of the path and at the end of the path Shapes can taper from larger dimensions to smaller dimensions or smaller to larger In addition Taper Maker needs to know if the selected path should be the center of the taper ora boundary of the taper Figure 3 3 specifies a square taper that is 1 2 square at the beginning of the path and 1 4 square at the end Enter Parameters for Square Name From Thick 1 2 To Thick 1 4 0 Path Position center HN Bevel Angle 0 0 f Cancel OK Figure 3 3 Example Data Dialog for Square and Diamond Taper Shapes Names for tapers are optional but highly recommended In preparing reports Taper Maker assumes that all tapers with the same non blank name and assigned to the Same stock unit have the same dimensions Unique tapers should have unique names all identical copies of a taper should have the same name Dimensions can be entered as decimal or fractional values and explicit units of measure for inches feet C millimeters mm centimeters cm and meters m can be appended to data If the unit of measure is not specified the current default Length Units setting on the
16. des the better the approximation of the curve but the larger the number of elements in the SketchUp model A special case of the Bernoulli spiral is the Golden or Golden Section spiral The growth rate of this spiral is based on the golden ratio golden rectangle As a result the input dialog for the Golden Section spiral is simpler than that for the Bernoulli spiral It requires only one radius at one turns to be entered 4 2 ARCHIMEDEAN SPIRALS In an Archimedean Spiral the radial distance from the spiral s origin to each point on the Spiral increases proportionately to the turns of the spiral See Figure 4 6 below Figure 4 6 Archimedean Spirals Including the Lituus upper right and the Hyperbolic lower right As with the Bernoulli spiral to draw an Archimedean spiral Curve Maker needs to know a how much of the spiral you want drawn and b the rate at which the spiral should grow How much you want to draw is expressed in terms of the number of turns complete revolutions you want the spiral to make around the origin How fast you want the Archimedean spiral to grow is expressed in terms of the distance the curve should be from the origin at any two points on the spiral including points outside the range to be drawn The interpretation of turns for an Archimedean spiral is the same as described in the section above except that negative turns are not relevant for an Archimedean spiral The
17. e 4 12 Helix Dialog Box 4 5 DISPLAY CURVE DATA Curve Maker writes the input parameters used to create a curve as SketchUp attributes of the group it creates These data may be viewed by using the Display Curve Data option from the Curve Maker submenu Plugins gt Curve Maker gt Display Curve Data The attribute values will be displayed in a dialog box and you will be given the option to have the data written in a SketchUp text box For example the attribute values for the sine wave above are shown in Figure 4 13 below SketchUp Example From cycle 1 4 Height 2 Sides Cycle 36 To cycle 3 4 Type Sine Width 3 Length 3 11 16 Write values in a text box No Yes Figure 4 13 Sine Wave Data Display If you elect to have the attribute values written in a text box the text will be positioned at the center of the curve You can then move it to a more convenient position in your model and or assign it to a different layer If you explode a group that Curve Maker creates the attributes will be lost and cannot be displayed again The curve would have to be recreated to recover the attribute values Similarly if you use a SketchUp tool to resize a curve the attributes will no longer be accurate 4 6 SELECT CURVES BY ATTRIBUTE Curve Maker will select the curves it has drawn that have a particular attribute value To select curves by attribute value use the Select Curves by A
18. e Wave and Helix In SketchUp curves are approximated by a collection of short straight lines edges Curve Maker will create a SketchUp group to contain the edges that comprise a curve You should use SketchUp commands such as Flip Along Rotate Move Scale etc to position the curve appropriately in your models To use Curve Maker choose the Draw a Curve option from the Curve Maker submenu on SketchUp s Plugins menu Plugins gt Curve Maker gt Draw a Curve The dialog box in Figure 4 2 will appear Enter Values Type Bernoulli spiral 13 Options Cancel OK Figure 4 2 Initial Draw a Curve Dialog Select the desired curve type from the drop down list and type any desired options Click OK Valid curve types are Archimedean spiral and 3D Archimedean spiral Bernoulli spiral and 3D Bernoulli spiral cosine for cosine wave Golden spiral and 3D Golden spiral and sine for sine wave A second dialog box will open prompting you for input data appropriate for the curve specified in the first dialog box Those inputs are described in detail below If prior to choosing the Draw a Curve menu option you have selected a SketchUp construction point in the model Curve Maker will use that point as the origin for the curve it draws Otherwise Curve Maker will use the origin of the SketchUp model as the origin for the curve When file or f is entered in
19. ear well formatted if the Leader Text option on the Text page of the Model Info dialog is set to a non proportional font such as Courier The data in the text box can be copied and pasted into another software application such 35 a spreadsheet or word processor If you elect to have the attribute values written in a text box the text will be written at the center of the selected tapers You can then move the text to a more convenient position in your model and or assign it to a different layer 3 6 SELECT TAPERS BY ATTRIBUTE Taper Maker will select tapers it has drawn that have a particular attribute value To select tapers by attribute value use the Select Tapers by Attribute option from the Taper Maker submenu Plugins gt Taper Maker gt Select Tapers by Attribute The dialog box in Figure 3 12 will appear Specify Selection Attribute and Value Attribute Stock z Value Cancel OK Figure 3 12 Select Tapers by Attribute Dialog Box Select an attribute of a taper from the drop down list and enter a value for the attribute in the value field Currently available attributes are Section Stock the name of the assigned stock and Alloy the name of the alloy associated with the assigned stock The dialog in Figure 3 13 selects all tapers in the model that have been assigned the Stock named 1 sq ss Specify Selection Attribute and Value Attribute Stoc
20. field Taper Maker draws the taper as if the underlying path were a straight line oriented along the x axis Such a taper illustrates what the tapered element looks like independent of any curves in the path and may be helpful in fabricating a taper Figure 3 15 shows an example of a straight taper drawn from the curved path in the figure When intervals or i is entered in the options field Taper Maker draws additional faces along the taper to index 1 inch intervals Figure 3 16 provides an example The intervals option and the straight option can be combined to index a straight taper prior to bending it AS Pal j s eE 2 22 5 hz 3 SZ u ne OTELE GI Figure 3 16 Example Intervals When file or f is entered in the options field Taper Maker will give you the option to read the taper specification data from a txt file and if you change any of the data values save the changes to a file 4 0 CURVE MAKER Curve Maker draws several pre defined curves The currently available curves depicted in Figure 4 1 include a Bernoulli logarithmic spirals including the Golden Section spiral b Archimedean spirals c Sine waves d Cosine waves and e Helix In addition three dimensional versions of the Bernoulli Golden Section and Archimedean spirals can be VS IN Figure 4 1 From Left to Right and Top to Bottom Bernoulli Spiral Archimedean Spiral Cosine Wave Sin
21. k HA Value 1 sq 5 Cancel OK 3 Figure 3 13 Example Select Tapers By Attribute Dialog 3 7 OPTIONS As illustrated in Figure 3 2 one or more options separated by blank spaces can be entered in the options field The valid options are offsets straight and intervals When offsets or o is entered in the options field Taper Maker does not draw a taper Instead it draws five tapered offset paths in relation to the path that defines the taper The paths correspond to the top bottom left right and center path positions which could have been used as the basis for drawing the taper See Figure 3 14a for a close up view of offset paths created by using the offsets option The path used to define the offsets is the thicker line in the center path in center Figure 3 143 Tapered Offset Paths Drawn in Relation to a Center Path The purpose of creating offset paths is to use them as paths along which additional tapers can be constructed Figure 3 14b illustrates the result In that figure the path that defines the taper on the left was selected and also used with the offsets option The top left and right paths created in this step were deleted The remaining bottom offset path was then used as the basis for drawing the taper on the right Figure 3 146 Taper on the Right Drawn Using an Offset From the Taper on the Left When straight or s is entered in the options
22. mes all identical copies of a taper should have the same name Dimensions are specified in terms of thickness vertical dimension and width horizontal dimension The data shown in Figure 3 7 specify a 1 2 x1 rectangular cross section at the start of a path that tapers to 1 4 x1 2 at the end of the path The selected path is to be positioned at the center of the taper Enter Parameters for Rectangle Name From T x W 1 2 x 1 ToTxW 1 4 x 1 2 Path Position center HN Bevel Angle 0 0 Cancel OK 3 Figure 3 7 Example Input Dialog for Rectangle and Octagon Taper Shapes Length data can be entered as decimal or fractional values and explicit units of measure for inches feet C millimeters mm centimeters cm and meters m can be appended to data If the unit of measure is not specified the current default Length Units setting on the Units page of the Model Info dialog will apply Establishing the from end of the taper and the position of the path relative to the taper is accomplished as described in the Section 3 1 above When one dimension of a cross section shape is larger than the other e g a rectangle Taper Maker draws Sample cross sections using the from dimensions at the from end of the path and the to dimensions at the to end and then asks you to verify that the Samples are correctly oriented If you click No in the dialog box the c
23. n using Stock Maker is to create a stock unit Choose the Draw a Stock Unit option from the Stock Maker submenu on SketchUp s Plugins menu Plugins gt Stock Maker gt Draw a Stock Unit The dialog box in Figure 5 1 will appear Enter Values Section Square HH Options f Cancel 4 OK 4 Figure 5 1 Create a Stock Unit Dialog Select one of the key words listed below from the drop down list to specify the desired shape Click OK Valid stock sections are square rectangle hexagon or round When file or f is entered in the options field Stock Maker will give you the option to read the stock specification data from a txt file and if you change any of the data values save the changes to a file A second dialog box will open prompting you for input data appropriate for the stock unit shape specified in the first dialog box Those inputs are described in detail below If prior to choosing the Create a Stock Unit menu option you have selected a SketchUp construction point in the model Stock Maker will use that point as the origin for the stock unit it draws Otherwise Stock Maker will use the origin of the SketchUp model as the origin for the stock As with any SketchUp model element the stock unit can be repositioned and or assigned to a different layer 5 1 RECTANGLE Stock Maker needs to know the name the dimensions of the cross section of the stock unit the alloy and
24. noulli Golden Section and Archimedean Spirals may be drawn such that they all lie on a two dimensional plane In addition spirals can be drawn in three dimensions In this case the height a point is off a two dimensional plane depends upon where the point lies on the spiral Figure 4 10 below shows a three dimensional Archimedean spiral and a three dimensional Bernoulli spiral 1 Figure 4 10 Three Dimensional Archimedean and Bernoulli Spirals To draw a three dimensional spiral Curve Maker needs one additional parameter beyond those already described above As shown in Figure 4 11 below this parameter specifies the rate at which the height of the points increase per turn A point at zero turns will have zero height and a point at one full turn will have the height specified in the Height Turn field This parameter can be positive negative or zero Specifying a zero value will result in a two dimensional spiral Height Turn 2 Figure 4 11 Height Parameter for Three Dimensional Archimedean and Bernoulli Spirals Another three dimensional curve supported by Curve Maker is the Helix Instead of Spiraling out from the center the points on a Helix maintain a constant radius from the center and the height the points are off a two dimensional plane depends upon where the point lies on the helix The input dialog to draw a Helix is illustrated in Figure 4 12 below Name Radius Turns Sides Turn 36 Height Turn 1 5 Figur
25. of the Path Left right top and bottom depend on context so when one of those positions is entered Taper Maker draws a sample cross section to one side of the path at the from end and asks the user to verify that the sample is on the correct side If you click No the taper is drawn on the opposite side of the path from where the sample appears This interaction is illustrated in Figure 3 6 SketchUp Is the path on the correct side Se Cancel Figure 3 6 Dialog to Establish Path Position Paths can be closed e g a circle oval etc Note that the path along which a taper is drawn does NOT have to have been created by Curve Maker It may be created by any SketchUp line drawing tool or by a combination of tools including or excluding Curve Maker 3 2 RECTANGLE AND OCTAGON When either one or both ends of a taper is a rectangle the rectangular cross section must be used As with the previously described taper shapes Taper Maker needs to know the dimensions of the cross section at the beginning of the path and at the end of the path In addition Taper Maker needs to know if the selected path represents the center of the taper or a boundary of the taper Names for tapers are optional but highly recommended In preparing reports Taper Maker assumes that all tapers with the same non blank name and assigned to the Same stock unit have the same dimensions Unique tapers should have unique na
26. r a model will be listed in the drop down list Optionally you may enter a number for Loss to increase the material estimate to accommodate the specified loss For example enter a value of 5 to factor in a 5 loss Based on the estimate the weight and cost of the taper is derived using the unit weight and unit cost of the stock These estimates are displayed in a message box as shown in Figure 5 7 and saved as attributes of the taper SketchUp Example taper Length 16 5 16 Stock 1 sq ss Alloy 304 Stock Length 7 1 8 Stock Weight 2 023 Stock Cost 1 93 Figure 5 7 Stock Estimate Message If you explode a taper group the attributes will be lost and cannot be displayed again Similarly if you use a SketchUp tool to resize a taper the attributes will no longer be accurate When a stock unit is assigned to a taper the SketchUp material for the taper will be the same as the assigned stock 5 5 ACCUMULATE REQUIRED STOCK Stock maker will accumulate total stock requirements for a group of tapers First select the tapers for which requirements are to be accumulated Next choose the Accumulate Required Stock option from the Stock Maker submenu Plugins gt Stock Maker gt Accumulate Required Stock or from the Taper Maker submenu Plugins gt Taper Maker gt Accumulate Required Stock The data will be displayed in a tabular form in a message box and you will be given the option to write the data
27. ross sections will be rotated 90 degrees before the taper is drawn Shapes can taper from larger dimensions to smaller dimensions or smaller to larger Depending on the values entered for thickness and width at the two ends a taper can start out rectangular and finish square or vice versa Likewise tapers can go from larger to smaller on one dimension and smaller to larger on the other Just as one dimension of a rectangle is larger than the other Taper Maker allows octagons to be asymmetrical As a consequence data for a rectangle or octagon Shape are entered in a common dialog box Figure 3 8 illustrates an octagon that starts out symmetrical but becomes asymmetrical as it tapers Figure 3 8 Example Asymmetrical Octagon 3 3 ROUND As with the previously described taper shapes to draw a round taper Taper Maker needs to know the diameter of the cross section at the beginning of the path and at the end of the path In addition Taper Maker needs to know if the selected path represents the center of the taper or a boundary of the taper The dialog box in Figure 3 9 shows the input data requirements to specify a round taper Names for tapers are optional but highly recommended In preparing reports Taper Maker assumes that all tapers with the same non blank name and assigned to the same stock unit have the same dimensions Unique tapers should have unique names all identical copies of a taper should have the same name
28. ttribute option from the Curve Maker submenu Plugins gt Curve Maker gt Select Curves by Attribute The dialog box in Figure 4 14 below will appear Specify Selection Attribute and Value Attribute Type I Value 4 Ny 3 Cancel OK Figure 4 14 Select Curves by Attribute Dialog Box Enter an attribute of a curve in the Attribute field and a value for the attribute in the value field Currently the only valid attribute is Type Valid values are the curve types listed earlier The dialog in Figure 4 15 below selects all sine waves in the model Specify Selection Attribute and Value Attribute Type z gt Value Sine Cancel OK gt Figure 4 15 Example of Select Curves by Attribute 5 0 STOCK MAKER Stock Maker estimates the amount of material required to make the tapers depicted by Taper Maker To compute an estimate Stock Maker requires you first to define a unit quantity of a material That quantity is referred to as a stock unit Examples of stock units include a linear foot of 1 x 1 mild steel or a pound of 3 4 round bar made from a particular bronze alloy Once a stock unit has been defined it can be assigned to tapers that have been created by taper maker In assigning a stock unit Stock Maker computes how much of the stock will be required to create the taper Stock Maker records this information as an attribute of the tapers The first step i

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