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Side bender waist caul
http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=53903
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Author:  bcombs510 [ Fri Jan 29, 2021 11:45 am ]
Post subject:  Side bender waist caul

Hello,

A question about side bender waist cauls. I made a set of molds and forms for a baritone uke. Everything was cut on a CNC with exact offsets to account for things like side thickness, slat and blanket thickness, etc... I’m still having a problem though getting the waist all the way down. I’m using a standard side bending jig with the press screw centered on the tower.

What I’m seeing is the waist caul gets bound up I *think* from the pressure point of the press foot. Basically it’s tipping a bit side to side. Words are failing me, here is a pic:

Image

I could put some cork on the caul but my goal was all this pieces are mated for each other so it should fit together nicely.

Any ideas of what I could try or is cork lined the deal? :)

Brad


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Author:  Ken Lewis [ Fri Jan 29, 2021 1:00 pm ]
Post subject:  Re: Side bender waist caul

Take it to the spindle sander and take a little off the center area 'til it fits, or even make it a tad concave.
The main thing is to have even pressure while under tension, imo.

Author:  bcombs510 [ Fri Jan 29, 2021 1:18 pm ]
Post subject:  Re: Side bender waist caul

Good call, I will try that. The test piece bent OK, so that’s good.

Image

Brad


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