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  1. 2nd August 2023, 10:33 AM #1
    Kickback
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    Default Eliminating tear/blow out Using Leigh Super Jig

    As the title says really. I've just started using my Leigh Super 12 jig for the first time to try and make a stacked box. Think timber version of the plastic craft boxes

    Admittedly, I am using dressed pine as my sample/practice and it's only 8mm thick. However, when I am routing the through dovetails, I am experiencing a little, inconsistent tear out. The router bit is brand new.

    The actual box will be made out of an unknown hardwood floor board species, thought to be Vic Ash, re-sawn. So it will also only be around 8mm thick.

    Other than cutting by hand Is there as a way of eliminating the tearout, or am I just getting this because its pine and the hardwood should be fine?

    Thanks
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  3. 6th August 2023, 12:50 PM #2
    tonzeyd
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    Are you using a sacrificial board behind the cut? This will support the back of the piece minmising blowout.

    If you havn't read the manual it does go through some techniques/tips to help minimise this.

    Other things you could try is taping the board, but i've found the sacrificial board works well.
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  4. 6th August 2023, 01:03 PM #3
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    Mr Brush
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    Default

    I'm not familiar with the Leigh jig, having only used the Gifkins - which does have a backer behind the workpiece to eliminate tearout there. However, especially when dovetailing birch ply for drawers, it's common to also get tearout/damage on the front side of the board where the cutter enters. To get around this I clamp a thin sacrificial "fronter" board sandwiched together with the workpiece so any breakout from the cutter entering the timber doesn't appear on your workpiece.
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  5. 7th August 2023, 09:09 PM #4
    Kickback
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    Quote Originally Posted by tonzeyd View Post
    Are you using a sacrificial board behind the cut? This will support the back of the piece minmising blowout.

    If you havn't read the manual it does go through some techniques/tips to help minimise this.

    Other things you could try is taping the board, but i've found the sacrificial board works well.

    O, I do feel stupid. Section 15 of the manual provide details for assisting in reducing/eliminating tearout

    Thanks. I will try these out
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  6. 7th August 2023, 09:25 PM #5
    tonzeyd
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    No worries, it's probably one of the better written manuals out there. When I use mine I always have it opened and go through step by step.

    Also doesn't help that I pull it out probably once every few years...
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  7. 7th August 2023, 10:09 PM #6
    Kickback
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    Default

    Quote Originally Posted by tonzeyd View Post
    No worries, it's probably one of the better written manuals out there. When I use mine I always have it opened and go through step by step.

    Also doesn't help that I pull it out probably once every few years...
    It certainly is an amazing resource. I think the historical standard in manuals/instructions resulted in me initially trying to hack my way through the process without looking at it. But having read most of it (with exception of the hints and tips section ), I too, had it open whilst working through each step.
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