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Thread: Best joint for frame
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18th November 2015, 07:39 AM #1GOLD MEMBER
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Best joint for frame
I was thinking of making a frame which would fit around a box being glued, and with T-nuts and bolts on each of the four sides, would be used to compress the sides.
So the proposed frame would be subject to forces on each side forcing the sides out, so would need to be strong in all 4 directions. The problem is selecting suitable corner joints for the frame. Through or half blind dovetails would be unsuitable as they are only very strong in one direction. Mitred joints would be far too weak.
Can anyone please suggest a suitable joint for the frame?regards,
Dengy
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18th November 2015, 09:03 AM #2GOLD MEMBER
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So what you're proposing to make is some cauls?
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18th November 2015, 10:23 AM #3
Try eight of these Bessey clamps from Masters. $11.40 each They're brilliant!
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18th November 2015, 12:25 PM #4GOLD MEMBER
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Thanks LGS. Sadly, there are 3 Bunnings in Townsville, and it doesn't look like Masters is coming here. I remember having a set of them over 40 years ago, and I used them for holding RHS steel in place while welding Still have them somewhere, but can't use them for wood any more
regards,
Dengy
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18th November 2015, 12:32 PM #5GOLD MEMBER
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Think I have it. Use a sliding dovetail tenon joint on each corner
regards,
Dengy
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23rd November 2015, 07:23 AM #6
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23rd November 2015, 04:14 PM #7
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23rd November 2015, 06:03 PM #8GOLD MEMBER
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23rd November 2015, 07:08 PM #9GOLD MEMBER
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Thanks for the pics, guys. The first one is exactly what I had in mind ian, mainly for dovetail joints where I let the pins and tails protrude outside the box sides and then cut them off after gluing. The side of the frame in the foreground would need to be very strongly jointed to the cross member, hence the question. Not so sure the two screws would be adequate when all those bolts are tightened and forcing the long caul in.
I was thinking a sliding dovetail joint or a pinned mortice and tenon joint for those joints
Arron, I find that band clamp great for mitre joints, not so good for my dovetailsregards,
Dengy
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24th November 2015, 04:59 AM #10
Hi Dengy
the base of the frame adds immense strength to the whole jig meaning that the corner joints don't need to be massively strong.
also the clamping pressure exerted on the box doesn't need to be that great. If you need great pressure to bring the box sides together, then there's something wrong with your box's joints and you need to think about re-cutting / trimming them.regards from Alberta, Canada
ian
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24th November 2015, 07:47 AM #11GOLD MEMBER
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Thanks ian, I hadn't noticed the base as it is much the same colour as the bench. Agree with your comments about the tension required for glue ups. I do tend to over-tension the joints
regards,
Dengy
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