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View Randy T's profile

Pipe Clamp Rolling

by Randy T
posted 10-04-2018 06:07 PM


7 replies so far

View bilyo's profile

bilyo

696 posts in 1496 days


#1 posted 10-04-2018 09:08 PM

My first thought is that the machining of the threads is not very smooth. Maybe you could first try some lubrication. If that doesn’t work, take a close look for roughness in the threads. Perhaps you can smooth it up with a small file. If there is a lot of roughness, maybe putting some abrasive paste on the threads and running them back and forth several times would help.

View lumbering_on's profile

lumbering_on

578 posts in 884 days


#2 posted 10-04-2018 09:24 PM

I agree with bilyo.

It sounds like the force is being converted into torque rather than the clamping pressure you need. The only way I see this happening is that the screw is catching on threads.

View Richard's profile

Richard

11274 posts in 3427 days


#3 posted 10-04-2018 11:35 PM



I agree with bilyo.

It sounds like the force is being converted into torque rather than the clamping pressure you need. The only way I see this happening is that the screw is catching on threads.

- lumbering_on

Agree!

Rick S.

-- Richard (Ontario, CANADA)

View patron's profile

patron

13648 posts in 3735 days


#4 posted 10-04-2018 11:45 PM

sometimes the adjustable clamp face is not flat
and has a high spot where the screw goes to it

it can make the clamp caul face pivot on this point
also can leave a dimple in the work edge

if that might be the case
take the face and file it flat

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View bilyo's profile

bilyo

696 posts in 1496 days


#5 posted 10-05-2018 03:30 PM



sometimes the adjustable clamp face is not flat
and has a high spot where the screw goes to it

it can make the clamp caul face pivot on this point
also can leave a dimple in the work edge

if that might be the case
take the face and file it flat

- patron

That’s a good suggestion also. After filing off the extreme high spots, I have put wood pads on my pipe clamp faces setting them in a bed of epoxy. That flattens them and provides a bit of cushioning to help them grip a bit better.

View Nubsnstubs's profile

Nubsnstubs

1569 posts in 2124 days


#6 posted 10-05-2018 03:37 PM

Put the clamp head on the pipe with a wrench, tighten as tight as you can, then drill a hole through the clamp and pipe, Insert a shortened nail into the hole, head side out of course, and bend the nail inside the pipe such that it can’t come out. Problem solved. Did that about 30 years ago to most of my Pony clamps. Wish I’d done all of them…......... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View Randy T's profile

Randy T

33 posts in 399 days


#7 posted 10-05-2018 05:09 PM

Folks:

Thanks for your suggestions. I will give them a try.

Jerry: The clamp spinning on the pipe isn’t the problem. It is the whole bar and clamp wanting to spin off the work piece. Holding the head of the clamp by hand while tightening it doesn’t help. The only way to stop the whole thing from wanting to spin off the work piece is to hold the clamp portion with a wrench while I crank on the handle.

-- Randy & Corinne, R&C Creations, British Columbia, https://www.etsy.com/ca/shop/RccreationsCanada

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