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| Bending jig cutaway, any cool ideas? http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=54253 |
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| Author: | rlrhett [ Sat Jul 17, 2021 2:14 pm ] |
| Post subject: | Bending jig cutaway, any cool ideas? |
I’ve been using a Fox bending jig for twenty years, and have never liked the cutaway solution. Something like in this picture.  It’s bulky and seems to come at the cutaway at a bad angle. I’ve notice factory jigs tend to press in line with the guitar centerline. In any case, if love to see if anyone has come up with a better mousetrap in this community. How do you get your cutaways bent? Sent from my iPhone using Tapatalk Pro |
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| Author: | Michaeldc [ Sat Jul 17, 2021 3:44 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
My setup is basically an adjustable Fox bender. You can change the waist location as well as the center of effort for the cutaway. Works great! |
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| Author: | James Orr [ Sat Jul 17, 2021 3:48 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
I use this to bend Florentine cutaways. I have not done a Venetian.    Sent from my iPhone using Tapatalk |
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| Author: | kfish [ Sat Jul 17, 2021 9:16 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
I love this bender Dan Koentopp uses. https://www.youtube.com/watch?v=HQMgt_kkMA0 Kent |
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| Author: | Michaeldc [ Sun Jul 18, 2021 11:14 am ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
kfish wrote: Genius!! I’ve been chewing on this since you posted it. Granted he’s bending 2-1/2” maple side (easy), but it seems like it should work with a 4-3/4” dread side. One may have to up the weight a little. Thanks for sharing! M |
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| Author: | kfish [ Sun Jul 18, 2021 11:41 am ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
Michaeldc wrote: kfish wrote: Genius!! I’ve been chewing on this since you posted it. Granted he’s bending 2-1/2” maple side (easy), but it seems like it should work with a 4-3/4” dread side. One may have to up the weight a little. Thanks for sharing! M I asked him about how long it takes to bend and he said about 10 minutes to complete the bend and then he cooks it for 15 minutes. I was thinking that was a cinderblock for a weight which should be plenty but on second look I guess it's not. So yeah, maybe a little more weight, though he does a lot of different woods in his builds. I don't know if he varies the weight. |
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| Author: | Michaeldc [ Sun Jul 18, 2021 11:44 am ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
kfish wrote: Michaeldc wrote: kfish wrote: Genius!! I’ve been chewing on this since you posted it. Granted he’s bending 2-1/2” maple side (easy), but it seems like it should work with a 4-3/4” dread side. One may have to up the weight a little. Thanks for sharing! M I asked him about how long it takes to bend and he said about 10 minutes to complete the bend and then he cooks it for 15 minutes. I was thinking that was a cinderblock for a weight which should be plenty but on second look I guess it's not. So yeah, maybe a little more weight, though he does a lot of different woods in his builds. I don't know if he varies the weight. He’s got an earlier YouTube vid from before he added the half cinderblock. The weight makes it look so easy |
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| Author: | rlrhett [ Sun Jul 18, 2021 12:20 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
kfish wrote: Wow! Now that’s what I’m talking about. So ingenious! I’m going to have to study that video a lot to fully understand that jig. Sent from my iPhone using Tapatalk Pro |
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| Author: | Dave m2 [ Sun Jul 18, 2021 4:04 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
The thing is with bending cutaways is that you have this double - Z - bend if you like. And what you have to do is to support the wood on the outside of both of those curves. To do this you have to tension both steel slats I have constructed an admittedly rather crude device to do this. It is not my idea. I think it was Mike Doolin who first suggested this in an early Gal and others have developed the idea. The trick is that the slats and the sides are fixed at the tail end and springs are used to tension the slats both above and below the side wood to provide support on the outside of the two bends. I always do cutaways - fairly sharp - and this has worked with few failures for me. Hopefully the pics show the general idea. Cheers Dave |
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| Author: | Terence Kennedy [ Mon Jul 19, 2021 9:52 am ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
Based on something I think I saw here I made an extension with a pulley and instead of springs ran a cord from the slats over the pulley and put on about 5lbs to tension the sandwich. Thought I had an in action picture but can’t find it. It has worked well. One nice thing about double sides and a tight cutaway is you can bend both together but with a much thinner thickness. |
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| Author: | Dave m2 [ Tue Jul 20, 2021 5:30 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
Terence that is another way to do it but although I haven’t measured it I suspect the springs I use are probably exerting rather more force. You are presumably bending pretty thin stuff if you are building double sides. Rather poor pics but I move the anchor points for the springs forwards as the bend is formed to keep the tension from becoming too great. I guess a weight on a pulley has the same effect. I am working with about 1.8 mm for the cutaway sides - a bit more for the non cutaway. And I do do a pretty sharp cutaway. Out of interest how are glueing the two laminates? Dave |
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| Author: | Terence Kennedy [ Wed Jul 21, 2021 1:16 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
Unibond 800 Dave. It’s worked great for me. Clamped over an inside form with shaped cauls. It also serves as the bending form. |
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| Author: | Dave m2 [ Thu Jul 22, 2021 10:48 am ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
Thanks Terence. Laminated sides is something I am likely to try at some point. Dave |
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| Author: | Joe Beaver [ Sat Jul 24, 2021 4:33 pm ] |
| Post subject: | Re: Bending jig cutaway, any cool ideas? |
KFish, That is the coolest, most versatile bender I have ever seen. I would love to know what he uses for a friction clutch. I don't notice him tightening anything as he goes. Well done. |
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