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I tried using CAD to draw my slingshot designs, but found it difficult and cumbersome to make the arcs to my liking. So I've been using the following method.<br><br>I make half a pattern by drawing out the slingshot on 1/8" thick hardboard (Masonite).<br><br><img src="http://dl.dropbox.com/u/29733857/IMG_2343.JPG" border="0" alt=""><br><br>I draw a straight line down the center of my wood blank, in this case the blank is 3.5" wide. Then I place the half pattern on the blank lining it up with the center line.<br><br><img src="http://dl.dropbox.com/u/29733857/IMG_2344.JPG" border="0" alt=""><br><br>I draw the oultline of the pattern half, then flip it over and draw the other side.<br><br><img src="http://dl.dropbox.com/u/29733857/IMG_2345.JPG" border="0" alt=""><br><br><img src="http://dl.dropbox.com/u/29733857/IMG_2346.JPG" border="0" alt=""><br><br>I then use a scroll saw to cut it out and so far just used router bits to round over the edges. I know this is probably pretty basic for most of you, but it works well for me. <br><br>Chuck
 

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So far I have tried out two different CAD programs: CadStd and Inkscape. CadStd is a LOT simpler to use than Inkscape, but offers merely a fraction of the features (I have only just scratched the surface with Inkscape, really. That stuff is COMPLEX). You are right, getting the curves exactly the way you like is really difficult and time consuming.<br><br>what I find practical is the possibility to copy contours directly from millimeter grid paper into the CAD program. That is what I did with my Bad Hammer design, I printed out Jörgs original drawing, traced the fork on millimeter grid paper and then transferred it 1:1 onto the Inkscape program. Took me an hour with a magnifying glass ("five left and two up, three left and two up, one left and three up .... jeez how much more ..." <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">)<br><br>I also like that you can convert and svg file into a pdf with a single click.
 

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Hi,<br>this is the mirroring method I use.<br>Works best for me.<br>The layout I do with everything laying around.<br>Thin metalstrips, old paint buckets...
 

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I use the same method when drawing by hand. I always make a full cardboard template to draw the contours.<br>About Inkscape, Hrawk made a nice tuto.<br><a href="http://www.youtube.com/watch?v=JFXdjVgbWd4" class="postlink" target="_blank" rel="nofollow">HERE</a> it is.<br>And <a href="http://www.youtube.com/watch?v=rAhTX5G2Nak" class="postlink" target="_blank" rel="nofollow">THIS</a> is his second one, more about circles.
 
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