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| Bending forms. http://luthiersforum.com/forum/viewtopic.php?f=10101&t=44682 |
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| Author: | jeanmiv [ Wed Dec 03, 2014 4:40 am ] |
| Post subject: | Bending forms. |
Hi! I read here that some of you make their bending forms 0.1 smaller than the actual sides. Being a little obsessed with accuracy, I'm trying to find the way to offset of that much from my full size template on a router table. I'can't seem to find the right combination of bushing or bearings producing a 0.1 offset. Any help welcome! Thank you. |
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| Author: | bluescreek [ Wed Dec 03, 2014 7:22 am ] |
| Post subject: | Re: Bending forms. |
first off , do you use a building mold ? 2nd when you plan to make a template you need to consider not all wood will bend the same. I bend about 250 sets a year and here is what I can pass on to you. Spring back will happen so there seldom will be a perfect bend with every wood . I set up my pattern this way off the center line not the apex of the bout and curve off the full size pattern. then compensate the bend by about 1/4 in so if the upper bout is say a 10 in radius start the curve at the point and flex if as it travels to the block. the waist just a tad tighter and lower bout , again about 1/4 in radius tighter than the design. this way the curve apex will match the mold and the spreaders will draw you tight. https://www.youtube.com/watch?v=QYHPCeVRUA4 |
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| Author: | jeanmiv [ Wed Dec 03, 2014 12:27 pm ] |
| Post subject: | Re: Bending forms. |
Thank you very much for a clear and concise answer John. I truly appreciate your help as I do enjoy your videos. PS: Yes outside mold is involved. Jean-Michel |
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| Author: | Nils [ Tue Dec 09, 2014 10:16 pm ] |
| Post subject: | Re: Bending forms. |
I have both molds for bending the sides, and outside molds for assembly. The inside molds that I bend with are cut using an 1/8" Whiteside spiral flush cut bit, (part #RFT1600) using the outside mold as the template. My sides, however, are not 1/8" thick, so its a little smaller than the actual dimensions for the side. |
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