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12th May 2021, 11:05 AM #1Intermediate Member
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Using shims to draw bore mortice and tenon
All the guides I've seen about draw boring a mortice and tenon joint perform the process in several stages. Bore a hole though the mortice, insert the tenon and make a make, bore a hole through the tenon with a 1/16th offset from the shoulder.
Is there a reason that draw boring is done this way instead of placing a shim under the shoulder and only boring once?
I'm curious about this as I'm about to do a few double tenon joints and using a shim would make it a lot easier to ensure the rod is aligned the entire way though.
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12th May 2021, 12:18 PM #2
If I'm understanding the idea of your use of a shim use correctly. The mark on the tenon has to be back towards the shoulder 1/16th .
Placing a shim moves the tenon out so is going in the wrong direction for a mark or hole .
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12th May 2021, 01:38 PM #3Intermediate Member
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Oh yeah, completely brain farted on the offset direction
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12th May 2021, 03:01 PM #4
I just glue and clamp the mortise and tenon together, punch a mark then drill and add the peg . I think back in a workshop in the 17th to 18th century they would have done the same . It’s a lot faster and gets the same result . Draw and bore is for those without a clamp or two or a job to big for your clamps .
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12th May 2021, 03:27 PM #5Intermediate Member
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13th May 2021, 11:21 AM #6Member
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An easy way to mark the hole in the tenon is to use a smaller brad point drill bit and use it like a center punch against the wall of the hole in the mortice piece. No measuring required.
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13th May 2021, 05:49 PM #7
Spot on; so easy:
- drill the dowell hole throgh the mortice,
- insert the tennon,
- use a brad point bit one size smaller than the dowell to mark the tennon,
- remove the tennon and drill it with the dowell-size bit,
- sharpen the dowell a little with a pencil sharpenner,
- reinsert tennon and drive dowell home.
- QED.
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