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Making violin clamps
Simply the simplest way to make simple clamps.
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Batto
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March 8, 2019 - 7:21 pm
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Simply the simplest way to make simple clamps.

carriage bolts 1/4  with a bag of wing nuts 1/4-20 and a bunch of precut wheels from Ebay. 1 1/2 inch 1/2 with a 1/4 hole.  21 bucks for 100 wheels which is enough to make 50 clamps. (currently I have 35 because  I ran out of wing nuts.)

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Irv
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March 8, 2019 - 9:08 pm
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I think that you need a layer of cork sheet on the inner wood surfaces of the clamp.   The stuff is about 1/8 inch thick.   

Research is what I’m doing when I don’t know what I’m doing.  —Werner von Braun

Without deviation from the norm, progress is not possible.         —Frank Zappa

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Batto
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March 8, 2019 - 11:13 pm
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Irv said
I think that you need a layer of cork sheet on the inner wood surfaces of the clamp.   The stuff is about 1/8 inch thick.     

i got a roll of cork as well. Today has been a rough day for the concussion so I wasn’t  able to start cutting it.

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Irv
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March 8, 2019 - 11:28 pm
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Do not use tygon type vinyl tubing as a thread protector.  It reacts with varnish.  A soda straw or poly tubing should work, or just make sure to keep bolt threads away from wood.

Research is what I’m doing when I don’t know what I’m doing.  —Werner von Braun

Without deviation from the norm, progress is not possible.         —Frank Zappa

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Fiddlerman
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March 9, 2019 - 7:43 am
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As Irv wrote, cork or leather is essential to protect the instrument. We make the clamps using a hole saw and glue cork as well. Especially practical when making big clamps for the bass. Those are otherwise very expensive to buy pre-made.

"The richest person is not the one who has the most,
but the one who needs the least."

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steveduf
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March 9, 2019 - 9:09 am
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I used a hole saw and 3/4” plywood... I used these pads and would recommend cork or leather instead.  This material doesn’t grip like you’d want1F2D3583-F128-48B7-8873-0524C4D559CA.jpegImage Enlarger

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Batto
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March 12, 2019 - 1:17 am
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I made the cork discs. I ended up using a roll of cork I picked up in the stationary section of menards.  I found the easiest way for me was to simply make squares put them on a clamp then cut off the corners and take a file to round them off. It worked surprisingly well, was a bit tedious, but I know they fit.

Now I can get onto glueing up my old violin.

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Irv
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March 12, 2019 - 7:32 am
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@Batto and others.  Photo lends the appearance of galvanized carriage bolts.  If so, extraneous protuberances on threads may slow the progress of the wing nut during glue up.  To be foretold is to be forewarned.

Research is what I’m doing when I don’t know what I’m doing.  —Werner von Braun

Without deviation from the norm, progress is not possible.         —Frank Zappa

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Batto
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March 14, 2019 - 2:04 am
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Irv said
@Batto and others.  Photo lends the appearance of galvanized carriage bolts.  If so, extraneous protuberances on threads may slow the progress of the wing nut during glue up.  To be foretold is to be forewarned.  

I figured that out when I was using the wing nuts. Thats actually an extra step I omitted writing down, every clamp I ended up screwing down as  tight as I could to 'break in' the threads. I'd actually argue that if you have access to a tap and die re-chasing the threads would be a benefit.

 

However I misplaced my set so go me!

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