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16th July 2020, 11:33 AM #46
Yesterday I went to Mathew's Timber and bought some laminated ¼sawn Vic Ash 285x38mm for a desk I'm going to build. Not being in the habit of having a Moisture Meter.....I only remembered it when I was too far from home to turn around. Well, I figured that buying commercially available timber wasn't going to be too much of a risk.
I measured the MC just now, using a SG of 0.68 and at 19mm & 6mm depth they are reading around 7.5-9% which seems pretty low to me. I would have though they might spend less time in the kiln rather than more? Perhaps it's the case that they'd rather sell the timber with no more realistic shrinkage, only possibly a slight expansion? Maybe Ken might have a comment on that?
I'm pretty confident in the timber - after all, these would be sold to joineries making benchtops etc, so I doubt they should give me problems.
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16th July 2020, 12:24 PM #47GOLD MEMBER
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Timbers like vic ash and tas oak are usually dried to below EMC. They are then reconditioned to the required EMC, usually by steam. Alternatively, they are sold prior to reconditioning and complete the process naturally in there new home - a much slower process. All done in the pursuit of stability.
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16th July 2020, 12:45 PM #48
Brett
"Victorian" Ash is a little like "Tasmanian" Oak and is a marketing term for a group of species as no such tree exists with that name.. Victorian Ash can be either Alpine Ash or Mountain Ash with densities of 620Kg and 680Kg respectively. I don't know if the manufacturer would use only a single species for laminating purposes. I would hazard a guess that they would try to use one or the other in any given product. Either way the density you have used may be distorting the result.
Try 620Kg (.62) and see if that results in more as you would expect. It also highlights the difference a variation in density makes.
In fact Victorian Ash is similar to Tasmanian Oak in that two of the species are the same with Tassy oak including Messmate Stringybark as the third timber. I just looked up the difference and Victorian Ash is when the timber is sourced, not surprisingly, from Victoria. It is as I said a marketing strategy.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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16th July 2020, 12:54 PM #49
Thanks Ken. At least my thinking was more or less on track.
I will, but I expect that will make a difference of around +0.75% (aka not much). I base that forecast on an email I got back from Wagner USA when I queried how to measure for SG >1.0 (because that's where the meter finishes).
They said to just subtract 1.5% MC for an extra 0.1 SG, so where I would read say 12% with SG 1.0, if the timber is 1.1 the reading manually converts to 10.5%.
Therefore a SG difference of 0.06, or close enough to half of 0.1 should mean an adjustment of about 0.75%. Will report back after readings.
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