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Thread: Align wood grain before gluing
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20th November 2009, 11:53 PM #1GOLD MEMBER
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Align wood grain before gluing
I am about to glue two boards together on their flat surfaces, not by their edges.
Can anyone please advise the correct alignment of the wood grains - ie A or B as seen in the sketch below
regards,
Jill
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21st November 2009, 12:17 AM #2
I would say B. Dont know why it just looks right.
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21st November 2009, 02:18 AM #3
B sounds good?
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21st November 2009, 03:31 AM #4Skwair2rownd
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Jill, if the boards were glued as in A then any cupping of either board is likely to effect the other. If both cup you have a problem.
If glued as in B any cupping meets resistance from the opposing board. This basically keeps the whole thing in balance and flat.
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21st November 2009, 02:11 PM #5
Back in the day when I was a young lad learning the qualities of woodworking from my favorite teacher and mentor (still dead now) Phillip Dillon, The B concept, as it would allow expansion and contraction without distorting the shape of the project.
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21st November 2009, 02:23 PM #6
Agreed - B uses the tendency of the wood to cup against each other to counteract any possible problems.
____________________________________________
BrettC
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21st November 2009, 02:23 PM #7GOLD MEMBER
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Thanks for this information, everyone. B it is
regards,
Jill
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21st November 2009, 02:33 PM #8
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21st November 2009, 05:34 PM #9GOLD MEMBER
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AlexS, I think this comes in to the category of a right way or wrong way to do something, and everyone knew the right way
regards,
Jill
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21st November 2009, 06:49 PM #10
Well, where angels fear to tread ....
I think it depends on what you're doing. If you are making a thick panel, B looks right.
If you're gluing long pieces together to rip legs on the diagonal, then B would not be what you want. You would want the cups facing away from each other, then each diagonal will look like quartersawn. Quite a handy way of getting lovely legs.
I recently glued two bits together to make bun feet. In that case, A was the go, as the join disappeared due to the grain continuing across. Since they will be supporting the entire piece and are overall only about 70mm diameter, no chance of cupping.
What are you making?
Cheers,
Tex
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21st November 2009, 08:49 PM #11GOLD MEMBER
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What are you making?
regards,
Jill
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25th November 2009, 10:19 PM #12Yet another newbie looking to build things....
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For something where straightness is crucial, like a fence, wouldn't you be better off using plywood or mdf?
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25th November 2009, 10:24 PM #13Senior Member
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great use of a foot
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25th November 2009, 10:51 PM #14" making wood good"
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25th November 2009, 11:08 PM #15GOLD MEMBER
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The real problem with the foot is that it is going to exert a strong backward bending force on the top of the fence, hence the need for a strong fence out of timber, not MDF or ply. Or so my thinking went
Also a track has to be screwed along the top of the fence for this hold down arrangement.
But I also take the point made above that the fence needs to be as straight as, so not sure if this idea will work. To compensate, the main fence will be 6mm thick 50 x 50 aluminium angle, with a sacrifical timber fence screwed to the front.
I am open to suggestions and comments on how better to do this hold down arrangement from a fence, bearing in mind it may be required to hold down a large panel like a kitchen cupboard door
regards,
Jill
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