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  1. #1
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    Mar 2008
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    Default 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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  3. #2
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    May 2011
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    Albury
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    Default

    So what you're proposing to make is some cauls?

  4. #3
    Join Date
    Aug 2007
    Location
    Melbourne
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    Default

    Try eight of these Bessey clamps from Masters. $11.40 each They're brilliant!


  5. #4
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    Townsville, Nth Qld
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    Default

    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

  6. #5
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    Default

    Think I have it. Use a sliding dovetail tenon joint on each corner
    regards,

    Dengy

  7. #6
    Join Date
    Jan 2014
    Location
    Northern Beaches, NSW
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    287

    Default

    Quote Originally Posted by Dengue View Post
    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
    I'm sure I recall that you can order online at Masters. We don't have one locally either but I was on their website a week or two ago looking at some other clamps.... I didn't end up pursuing them though.



    Thx
    Jon

  8. #7
    Join Date
    Feb 2003
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    back in Alberta for a while
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    12,006

    Default

    Quote Originally Posted by Dengue View Post
    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.

    Can anyone please suggest a suitable joint for the frame?
    something like this?



    or this

    regards from Alberta, Canada

    ian

  9. #8
    Join Date
    May 2003
    Location
    Central Coast, NSW
    Posts
    3,330

    Default

    I use these.

    band clamp.jpg

    cheers
    Arron
    Apologies for unnoticed autocomplete errors.

  10. #9
    Join Date
    Mar 2008
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    Townsville, Nth Qld
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    Default

    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 dovetails
    regards,

    Dengy

  11. #10
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    Feb 2003
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    back in Alberta for a while
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    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

  12. #11
    Join Date
    Mar 2008
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    Default

    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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