spruce plywood |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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Posted: 09 October 2017 at 8:10pm |
Does anyone use spruce plywood?
It isn't as stiff (apparently about 20% less) but is about 2/3 the density of birch ply. so if you use 21mm spruce instead of 18mm ply you have panels that are 30% stiffer but 25% lighter. I expect it doesn't wear tools as quickly either. Any downside I am missing? Phil |
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nickyburnell
Old Croc Joined: 06 February 2005 Status: Offline Points: 4410 |
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There is a thing called Wisa Twin. Softwood inner 9 plys or so hardwood good faced outer. Used it on a pair of MS18, was good but not much cheaper than Birch which I could not get in time. They were biscuit joined though, not routed. But jointed cabs built in far east with Spruce all over You Tube
It has been pointed out by on here that saving 15 quid a sheet is probably a tiny amount when you figure in grills and paint, that said, 150quid will buy the paint and grills for 4 scoops and that's a good ten sheets..... Edited by nickyburnell - 09 October 2017 at 9:06pm |
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It's everything, not everythink!
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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You probably won't get as good a finish, especially on end-grain and I expect it would dent and take corner damage more easily.
Lower density and stiffness will also probably mean higher panel vibration and energy dissipation in the cabinet. However if you can live with or work around those then there's no big reason not to use it.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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surely you would move any vibrations higher in frequency, further away from the operational band, and therefore reduce panel vibration. |
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Lower stiffness will reduce the resonant frequency.
Also, you don't need a resonance for the panel to flex. Edited by ceharden - 12 October 2017 at 12:20am |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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but it's only the stiffness per unit thickness that is lower. the stiffness per unit weight is approximately doubled. (as stiffness is a function of thickness to the power three.) |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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quite right. resonance is a function of stiffness, mass, and damping. energy loss due to flex is just down to stiffness. |
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