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Bowclamp Modern technology used to realize an age-old idea: a perfect bow shaped arc. The Bowclamp's patented design - made possible only with the help of computerized, numerically-controlled cutting technology (CNC) - allows for equal clamping pressure along the entire length of the glue line... with only one clamp at each end!

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  #1 (permalink)  
Old 10-25-2011, 04:22 PM
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Default Shouldn't pass without mention

Video: Glue up a Panel | Popular Woodworking Magazine


And the money quote from the comments:

Quote:
Don't buy into the argument that you have to add 1,000 pounds of pressure to get a good joint.






Discuss amongst yourselves...
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Old 10-26-2011, 07:12 AM
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Default Re: Shouldn't pass without mention

Hide glue has different properties than most other glues in that it shrinks as it dries. It is my understanding that this is what makes rub joints possible. On a tool chest I made, the wooden pulls are attached with hot hide glue and rub joints only. Two years later, they are still on solidly.
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Old 10-26-2011, 09:10 AM
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Default Re: Shouldn't pass without mention

Quote:
Originally Posted by CraigFeuerzeig View Post
Video: Glue up a Panel | Popular Woodworking Magazine


And the money quote from the comments:
Quote:
Don't buy into the argument that you have to add 1,000 pounds of pressure to get a good joint.




Discuss amongst yourselves...
Well, it would appear that Chris schwarz could also use a little education on the difference between force and pressure. You don't apply a pressure. You apply a force and the pressure is the result.

It's a little lower budget video...just me and the Ninja Kitty in the shop on a Saturday afternoon last winter.

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Old 10-26-2011, 09:31 AM
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Default Re: Shouldn't pass without mention

Ah, fall-season re-runs... I remember this from last year.

I like ya, Rick, but I have to say I was hoping for a YouTube moment when you got on the ply on the snowbank!
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Old 10-26-2011, 12:14 PM
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Default Re: Shouldn't pass without mention

Chris could use an education about a couple of things... but ya know... even a stopped clock is right twice a day.

For the record he's not a fan of the Bowclamp. Yet.

Usually people who are not fans, are not fans because... they fall into the bone-crusher camp.

Chris is just ignorant.

Like many, he just is unaware of all the different uses for a Bowclamp in a wood-shop. He thinks they are for panel glue-ups. Only.

My point is this:

Even if you wouldn't use them for a panel glue-up (although you should) there are still a hundred reasons why you should have Bowclamps in your shop.

Hello bone-crushers! Come on in... the water's fine.

We do veneering, marquetry, inlay, cabinet assembly, edge banding... the list goes on and on.

You can't be crushing every glue-up? Can ya?

edited to add: Not you Chris... him Chris.
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Old 10-26-2011, 12:24 PM
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Default Re: Shouldn't pass without mention

Just a thought... if cauls were shaped concave instead of convex (think sprung joint), a single clamp would be able to apply the pressure. I think cauls are often (usually?) convex because when put across the face of a panel, it is much easier to apply two clamps at either end rather than one in the middle (which would require a clamp with an extra-deep throat. But for glue-ups like in him-Chris' video, a clamp is able to be applied to the middle of the cauls.

I hope that made sense.

Chris (me).
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Old 10-26-2011, 12:31 PM
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Default Re: Shouldn't pass without mention

Actually I've played with that pretty extensively. The curve doesn't lay down against the piece the same way. What you get is an m. Pressure in 3 spots... the middle and the ends.
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Old 10-26-2011, 12:33 PM
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Default Re: Shouldn't pass without mention

Hi Craig,

Yeah, I figured that you'd thought of and experimented with that idea. Now you've got me thinking of what I can use a M-shaped pressure field for.
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Old 10-26-2011, 12:40 PM
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Default Re: Shouldn't pass without mention

Just ask anybody who is still making their own curved cauls. They are only getting pressure in 3 spots.
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Old 10-27-2011, 03:07 PM
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Default Re: Shouldn't pass without mention

Quote:
Originally Posted by CraigFeuerzeig View Post
Video: Glue up a Panel | Popular Woodworking Magazine


And the money quote from the comments:
Quote:
Don't buy into the argument that you have to add 1,000 pounds of pressure to get a good joint.


Could he possibly have meant "force"???

I agree with Chris -- using (hot) hide glue is a whole different animal. I haven't used the bottled cold stuff though I should -- I just wish the hot hide glue had much more open time.
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