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I am having trouble using a corner clamp for my 45 degree miters. I try my best to align them and tighten them but the wood is always moving out of place.

What is the best method or just how they are used in general? I just can not figure out how to get a tight, corner joint.

Update v1.2: This is the type of clamp I have. enter image description here

Update v1.3: I forgot to say, this image came from google. Do not know what site but image of the same thing (just different angle shot) from HomeDepot

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    Need to know which style of right-angle clamp you have. There are two or three main types and they work differently. Link to a picture, or better yet add the picture to the Question to help future searchers. – Graphus Nov 3 '16 at 8:08
  • k i will add a pic off google. did not even realize there are different styles... – Ljk2000 Nov 3 '16 at 22:30
  • Thanks for adding the pic. That's the style I thought you meant, just didn't want to assume and post not-really-relevant info :-) – Graphus Nov 3 '16 at 23:43
  • Ya, should have thought of adding the picture sooner :) . But some of these answers do give little good tips in my book. – Ljk2000 Nov 4 '16 at 2:12
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    Taping your miters is also a really effective way to hold alignment. For miterfolding parts, our shop will lay the parts flat, with the long point of each miter touch, then tape the joint, and then fold it together. – Jacob Edmond Nov 4 '16 at 10:13
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I would invest in some of thise: Collins Miter Clamps

I bought a set a little over a year ago, and I'll never do miters without them. They are especially great for trim work.

from Collins web page

from Collins web page

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  • They look very nice, what is the price on these? – Ljk2000 Nov 3 '16 at 22:34
  • Those look like they'd work well, even better than the old DIY version of the same thing clipped from bed springs. My only objection to these is the divots left behind, small though they are. – Graphus Nov 3 '16 at 23:45
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    @Ljk2000 Before you rush out to buy anything wait until you see my Answer. I'll try to post later on today. – Graphus Nov 4 '16 at 8:02
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    I hope @Graphus is ok...it's not like him to keep us in suspense! :) – rob Nov 5 '16 at 4:32
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    @Graphus Jeez, man, this is even worse than when Firefly got cancelled, haha. – Jason C Nov 11 '16 at 5:00
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In my opinion although it looks simple this joint is as difficult as some of the more technically difficult ones. First off make sure all are cut true and to length, then my choice is band clamps with a dry run. Once everything is assured with the dry run then add glue :) mine still sometimes move when you add the glue. Don't forget the joint may need reinforcement with splines or something but i add these when dry.

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  • I try to do this by using my hands and best I can line them up. When I got them lined up nice I use a square and check. My miter seems to fairly accurate but should use my chamfer bit on the router. Just planed them too thin, dumb mistake I made. – Ljk2000 Nov 3 '16 at 23:06

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