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| Do You Build Your Bending Forms Smaller Than Finished Size? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=39850 |
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| Author: | LarryH [ Tue Mar 26, 2013 4:22 pm ] |
| Post subject: | Do You Build Your Bending Forms Smaller Than Finished Size? |
Or to actual size? Does it vary with large and small guitars? If smaller by how much? |
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| Author: | John A [ Tue Mar 26, 2013 4:36 pm ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
Build your form smaller - smaller by the thickness of your side plus blanket and slats if you are using them. In my case I build my form approximately 1/8" smaller than the desired shape of my side. |
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| Author: | arie [ Tue Mar 26, 2013 5:09 pm ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
i go smaller as well plus taper the ends inboard about 3 deg or so for spring back. i also pull the waist in tighter with a slightly smaller radius -again to deal with spring back. when all is bent up things pretty much relax to near net shape with very little tweaking needed. i also have some adjustable setting forms as well to place the sides into after they come off the bender. |
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| Author: | theguitarwhisperer [ Tue Mar 26, 2013 8:03 pm ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
I do mine the same size as the template and haven't had any problems, even with OM and smaller sizes. |
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| Author: | James Ringelspaugh [ Tue Mar 26, 2013 8:42 pm ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
I draw the outline of 1/2 the body on some plywood, then I draw another line about 1/8" inside of that. At the bandsaw I cut out the space in between the lines. Finally I clean up the curves on a spindle sander. The outside becomes a mould template if I need it and the inside becomes a bending form template. |
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| Author: | mkellyvrod [ Wed Mar 27, 2013 6:48 am ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
I do mine same as James. I make the outside mold and the bending form from the mating pieces of plywood. I use my scroll saw to cut 3/4 inch birch plywood and then spindle sand each piece. Hadn't really given any thought to purposely making the bending form slightly smaller, I'm just cheap. |
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| Author: | meddlingfool [ Wed Mar 27, 2013 9:14 am ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
Yup. I make my outside mold first, then trace inside it with a 1/8" sharpie, then sand the sharpie line til it's gone. More or less accounts for side width. |
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| Author: | Don Williams [ Wed Mar 27, 2013 10:39 am ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
Same here, but I usually go for .125 - .150 or so. Thickness of side + heat blanket + slat, so it depends on what I'm building and how thick the sides are going to be. |
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| Author: | Fred Tellier [ Wed Mar 27, 2013 11:38 am ] |
| Post subject: | Re: Do You Build Your Bending Forms Smaller Than Finished Si |
I have a washer like Todd's but at about .150" so my bending form is that much smaller. I have never had issues with spring back that was excessive but sometimes have to touch up the waist and cutaway by hand. I really like Dreadnoughts as bending is so easy. Fred |
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