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How much pressure does a single woodworkers clamp exert.

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Forum topic by Ted Hunter posted 04-15-2011 07:33 PM 5400 views 0 times favorited 9 replies Add to Favorites Watch
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Ted Hunter

5 posts in 3383 days


04-15-2011 07:33 PM

Trying to do some calculations on clamping pressure over an area but need to know the pressure exerted by a decent 6” woodworkers clamp. Anyone know? I did some searching online but did not find anything. Still looking.

Ted

-- http://www.roarockit.com


9 replies so far

View jayman7's profile

jayman7

218 posts in 2968 days


#1 posted 04-15-2011 07:40 PM

You can try testing it by clamping a simple bathroom scale.

View Loren's profile

Loren

8302 posts in 3110 days


#2 posted 04-15-2011 07:49 PM

Some clamp manufacturers state specs for their clamps.

Cheap-o chinese no-name clamps will break when you crank them
down really hard.

View richgreer's profile

richgreer

4541 posts in 2537 days


#3 posted 04-15-2011 09:36 PM

I saw an article about this once. It spoke of the amount of pressure you can get from different styles of clamps. I don’t remember exact numbers but I recall that they varied by type of clamp from about 200 pounds to just over 1000 pounds. I would guess that a 6” woodworkers clamp would be about in the middle of that range. Please note the word “guess”.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Ted Hunter's profile

Ted Hunter

5 posts in 3383 days


#4 posted 04-15-2011 10:04 PM

This is a link I found that tells some different pressures for clamps.
Clamp pressure
Sorry that it goes to a vendor site.

Anyone starve a glue joint on a material like maple by having too much clamp pressure?

-- http://www.roarockit.com

View SASmith               's profile

SASmith

1850 posts in 2450 days


#5 posted 04-15-2011 11:46 PM

At Matthias Wandel’s site he shows that his homemade wooden deep throat clamps apply over 260lbs of force.
http://woodgears.ca/clamps/index.html
I would think most metal F style clamps would apply more pressure.

-- Scott Smith, Southern Illinois

View Grandpa's profile

Grandpa

3256 posts in 2138 days


#6 posted 04-15-2011 11:55 PM

I read the article on clamp pressures also. It was probably in Wood magazine or The Family Handyman. Seems like the Irwin clamp made for single hand use was the lowest in the 250 lb range with the wood hand clamps in the 600 lb range and the bar type clamps were over 1000 lb. I would think you might look at their sites and find something. They did caution about using too much pressure and squeezing all the glue out cause a glue starved joint.

View bobsmyuncle's profile

bobsmyuncle

110 posts in 2154 days


#7 posted 04-16-2011 02:39 AM

View childress's profile

childress

841 posts in 3004 days


#8 posted 04-16-2011 06:48 AM

Anyone starve a glue joint on a material like maple by having too much clamp pressure?

nope… can only be done with hydraulic clamping

-- Childress Woodworks

View HorizontalMike's profile

HorizontalMike

7144 posts in 2376 days


#9 posted 04-16-2011 02:37 PM

What bobsmyuncle says. This can be where all those cheap Chinese clamps come in handy. While they do NOT clamp as tightly, many of them spaced close together will do just fine in a glue-up.

-- HorizontalMike -- "Woodpeckers understand..."

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