Maybe these comments can help those of you (like me) who have experienced bowed panels from glue up. I had pretty much corrected the problem with cauls, but found them to be a pain in the butt. Usually 3 cauls, one on each end and in the middle, secured with a plethora of C clamps. So I’m reading the Veritas/Lee Valley catalog one day and am intrigued with their “panel clamps”. Basically two 2×2’s with 3/4 inch holes bored in them secured by the panel clamps. Used them for the first time yesterday and, with a minimum of hassle, clamped and unclamped a dead straight panel. These clamps (and I was sceptical) are essentially cauls but the clamps exert both downward force to flatten the panel and pressure to push the boards together. If anyone else has tried these, I would like to know your results. PMM
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Replies
Why do you find the cauls to be a pain? I've been using curved cauls for over 25 years and find them to be really simple and straight forward. The thing I find most useful is that I use my standard quick clamps and bar or pipe clamps. I typically put them every 18" or so and use two long beams underneath the whole sey-up to line everything up. I can single handedly glue up a 4' x 8' panel in one shot and get perfect alignment which means I plane my stock to finished thickness before gluing up sp all I have to do is scrape off the glue and sand and I'm done.
How much arc is there in your culls?JigSawJohn
About 1/8" over a 48" caul. If you don't have the arc it doesn't work properly. Basically the curved caul method is the same thing for a low tech veneer press.The only thing different is you add plywood pressure spreaders under the cauls to make it a veneer press. Can't beat the fact it uses clamps you already have in your shop and the curved cauls are perfect for clamping shelves in a large carcass. Probably one of the simplest tools you can add to your shop. I still can't imagine why you find them to be a pain in the neck. I find them so simple to use and I get perfect panels every time. Pretty much foolproof.
Dear Rick,
Um.......... hmmmmmmmmmmmm........ what a caul?Best,John
http://www.bowclamp.com/product.html
I do not advocate buying cauls. It's something you can make from scrap. The T slot is not necessary. I only used his site to show how useful the caul is. The caul goes back many years. You'd think he invented it!!!!! The subject has been covered in FWW. http://www.taunton.com/finewoodworking/Community/QADetail.aspx?id=26546
I made 30 2'x3.5' raised panels for my house,plus all my kitchen cabinate doors, and glued all of them with those panel clamps, and love them. I have a dedicated clamping table, and would glue two at a time(two seperate clamps). I think they are great.
Pedro
thanks for the input. I love mine. You are apparently the only other person out there who has used them. Makes nice flat panels a breeze. PMM
OK ... I'm curious ... what type of clamps are you speaking of. I looked on the Lee Valley web site and could not find a listing for "panel clamps".
Barry in WV
I think this is what he's talking about.http://www.leevalley.com/wood/page.aspx?c=2&p=31181&cat=1,43838,47843&ap=1I have some but haven't tried them yet; this thread gives me the encouragement I needed.
Great !! Thanks a lot!! I've ordered a set. They look like they will work. They are a bit pricey for what you get, however ...
Barry in WV
Dear Anderson:
Anon answered your question before I could but he pointed you to the clamps. Hope they work for you as well as they do for me. PMM
I made panel clamps,used mostly for gluing up boards edge to edge. Very simply 2x3's with holes on 4" centers.The back piece has 3/8" tee nuts for 3/8" bolts and washers.My setup is vertical although could be laid down for horizontal applications. I run the bolts up quickly with a cordless drill using the clutch. The 2x3's were varnished and an occasional coat of wax so glue doesn't stick to them.I have been using them for about ten years, similar in design to the Plano system.I snug up the bolts but not real tight at first, add pipe or bar clamps ,then tighten the bolts.
The panel clamps pull the boards into alignment and the bar clamps then added to tighten the joints.
mike
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