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Thread: Biscuits or dowels
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13th January 2013, 12:20 PM #1Intermediate Member
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Biscuits or dowels
Hi
Have been making a table top with Huoen Pine and river red gum and just would like your thoughts on the joining
method of the timber
Have attached some pics to show what i am attempting The blank corner pieces will have bookmatched pieces
of the river red gum and the center piece will be surrounded by river red gum
Any tricks or thoughts would be very much appreciated 008 (4).JPG009 - Copy (2).JPG011 - Copy.JPG
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13th January 2013, 12:52 PM #2
If I was attempting that, I would use buscuits, as I think glue-up time would be a bit easier.
But others more experienced may have other ideas.
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13th January 2013, 01:14 PM #3
Use either for the purpose of alignment only, not needed for strength of well jointed edges, but before you glue it up, how have you accounted for
expansionmovement within the border?
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13th January 2013, 01:24 PM #4Intermediate Member
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biscuit dowel
Hi
mic-d in all honesty i have not given any thought to the movment of the timber inside the boarder !!
Am i attempting something that will not work??
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13th January 2013, 01:37 PM #5
Timber expands and contracts with the seasons (humidity) across the grain. If you put a solid timber (as in, not ply with veneer top) board inside a border like that it will either shrink away from or bust open the border depending on whether it shrinks or grows - or even does both over time. Additionally it looks like the blocks within the top will be glued up end to edge which will cause similar problems. It will be difficult to do it without leaving a gap on one or both sides for the boards to expand into. You could cut the boards into veneers and glue them to a ply backing to achieve the same look, and it will be stable, and you may have enough material to make several tables.
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13th January 2013, 05:54 PM #6Intermediate Member
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biscuit dowel
Have been thinking about the movement of the timber and was just wondering if i were to on the underneath side
fit a bow tie to all the pieces would this stop/restrict the movement enough to use the solid pieces
or am i chasing the impossible
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13th January 2013, 09:03 PM #7
It's all about percentages. If you kept the timber for a while in a humidity-controlled environment to equilibrate to the same moisture content and then made it and sealed it very well with shellac and kept it in the same humidity controlled environment then you stand a good chance that it will be OK, but who can do that except a museum. Your percentages drop if you suffer big changes in humidity. Timber movement is very powerful and if you put a couple of bow ties underneath each section you might find splits appearing between those fixed point. Sorry to be pessimistic. Others may have a different opinion.
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13th January 2013, 09:22 PM #8Intermediate Member
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bic/dowel
Hi
mic-d Thanks for taking the time for the info its all appreciated
The river red gum has been sitting in a barn for nearly 16 years so should be
fairly stable and not sure with the h/pine as to how long it has been drying
living in S.A. our climate is fairly stable and i could finish with poly/u so would be
well sealed (talkin myself into trying it arn't i ) once again thanks for info
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13th January 2013, 09:53 PM #9
You can but try, it is only furniture after all, not the space shuttle. Good luck. I would seal it well with several coats of shellac even if you finish it with poly, shellac has the best resistance to moisture vapour of any finish.* Good luck.
*Flexner - Understanding Wood Finishing
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15th January 2013, 10:06 AM #10
Hi Rob
what you are attempting is high risk if you re usiung solid timber.
If you can garantee that all the wood is at optimum moisture content and wont be exposed to change in humidity, then the top might last a very long time.
for more usual environments, band sawn veneers on a stable ground (MDF, quality ply, or particleboard) is a much better choice. remember to use similar thickness veneers on both sides of your ground.regards from Alberta, Canada
ian
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