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I've had some luck with this design from Bessey. (Oops realized these are what you are using now)I don't particularly like the "ratchet" design like what Rockler offers. It is too easy for the strap to bind. http://www.besseytools.com/en/subcategory.php?ASIMOID_MC=000000000001f3f000030023&ASIMOID_SC=000000020003ebc900020023Another design I would like to try for doing larger pieces are these. For small batch production these seem quick and easy to setup. My plan would be to use these at the corners and then once they are in place run your Bessey's in from the edges to get even pressure. https://www.fine-tools.com/frame-clamp.htmlThese are also nice given they don't weigh much and seem easy to adjust. They make it with a "miter attachment" which is on the second link below.https://www.fine-tools.com/bar-clamp.htmlhttps://www.toolsforworkingwood.com/store/dept/CDC/item/MS-ABAR.XXhttps://www.thebestthings.com/newtools/uniclamps.htm
I use splines to achieve mitered joint alignment. My saw blade cuts a 1/8" kerf and I use 1/8" aircraft grade plywood as the spline. The spline keeps the sides from sliding out of alignment while being glued.If I am worried about the splines showing, I use the same species as the sides for the splines.Technique works well.
@HarveyWildes has the right idea despite the reservations of @Greendave Take a look at the way I did these long mitre glue-ups using ordinary masking tape. I had perfect results throughout this project using this method.I know a chap who makes humidors that have solid silver hinges, lots of other bling and they retail at over $40k - he uses this same method for the boxes and some of them are not small at all.Peter
Does anyone have any other methods of gluing up smallish (40 x 40 x 40cm) boxes that lend themselves to batch production so no using endless amounts of g-clamps and angled clamping blocks etc?
Quote from: Greendave on January 02, 2017, 07:18 AMDoes anyone have any other methods of gluing up smallish (40 x 40 x 40cm) boxes that lend themselves to batch production so no using endless amounts of g-clamps and angled clamping blocks etc?Use some clear packing tape along the outside of 3 miters, and one on the fourth edge, turn over apply glue, tape fourth side and let dry. Doesn't require a lot of pressure.Tim
Would just the glue be sufficient for a sturdy box that will be taking a lot of weight and more than one stacked on top of each other?
Quote from: Greendave on January 02, 2017, 03:13 PMWould just the glue be sufficient for a sturdy box that will be taking a lot of weight and more than one stacked on top of each other?It really depends on how much weight and quality of the wood and or orientation of the long grain. I would try it without first. If long grain to long grain, mdf or chipboard you usually don't need reinforcement unless you are applying a lot of weight. If end-grain, you definitely need reinforcement. I don't like dominoes for these joints as they can create more problems than they solve. I use biscuits, but cut them close to the inside to avoid telegraphing through on the front from the swelling biscuit. Tim
Out of interest what kind of issues did you have with them?
Quote from: Greendave on January 02, 2017, 03:36 PMOut of interest what kind of issues did you have with them?To close the miter with the glued dominos in place requires some pressure which pushes one or the other side of the miter out of alignment unless you use blocks and clamps at right angles to the miter. (Attachment Link) You could try to use the domino in a hole with the widest setting to reduce the fricton. Do a test with the miter fold technique described above. Tim
Thanks, i'm definately giving that method a go but i'm concerned about strength when just using glue.
Quote from: Greendave on January 03, 2017, 05:45 AMThanks, i'm definately giving that method a go but i'm concerned about strength when just using glue.I just glued up some 1/2" 13mm mdo as a test for a plinth I am making and it is very strong. I stood on the corner and I can't break it. Tim
Dave,I made these clamps for my boxes, I got fed up trying to hold the straps and corners on the Bessey clamps, these are all made from 18mm birch plywood.I have changed the clamp nuts to plywood star handles with inserted T nuts.