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27th October 2018, 03:04 PM #1GOLD MEMBER
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Cutting Veneers - moisture content
Hi guys,
Quick question for those with experience in such matters.
Is there any down side to cutting veneers off a relatively fresh sawn / green bit of timber? Lets say 30% or so.
Are the veneers much more likely to warp as they dry relatively quickly with minimal restraint? The advantage is not having to wait years for them to dry and if movement is limited to cupping / bowing that obviously won't be an issue when gluing them onto a substrate.
Just trying to figure out what the maximum recommended moisture content for a billet should be before cutting it into thick veneers eg. 2-3mm.
Cheers, Dom
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27th October 2018, 07:35 PM #2
I’d reckon the advantages would be less wear and tear on your blades.
The downside might be that you end up with kindling, that’s unlikely though. The pros do it green as grass.
i think it is all about how you store the material after you slice it.There ain't no devil, it's just god when he's drunk!!
Tom Waits
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27th October 2018, 10:04 PM #3GOLD MEMBER
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27th October 2018, 10:21 PM #4
I did this and ended up with warped like a potato chip Blackwood . It was from fresh cut green Balckwood though . I could still use the stuff as its good 1/4 sawn guitar quality and I think a burst in a steam box and pressing it flat would fix it . I would have been better off just leaving all of it at 1 or 1.5 inches and re sawing later . I left a fair bit that way as well. The bits I did thin , around 6mm, I bundled together with sticks in between nice and even, so everything could breathe and move, and tied it all together to allow movement across the width as it dried. I didn't need them in a hurry though so it was a mistake I learnt from .
edit
Ripping and drying for a veneer to lay may be a different thing than my 6mm . like if you did them at 3mm with one side machined flat and dried it while pressed . I don't know if that would work . Ive done that dry plenty of times but wet still has to shrink . I wonder if sliced veneer is sliced off wet and then dried at .6 mm? You would think it must be because they couldn't wait around for a log to dry before slicing it .
Rob
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27th October 2018, 11:03 PM #5
I just happen to have a book on veneering from the 1920s sitting next to me . They explain Cutting African Mahogany logs into flitches then slicing that into different thicknesses , depending on what was wanted. And then hanging that to dry in a drying room .
IMG_9556.JPGIMG_9558.JPG
Rob
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28th October 2018, 08:06 AM #6
The Cairns region was a leading producer of veneer and for manufacturing plywood. Sliced and rotary veneer mills were quite common. I used to ride home the long way from school via the Capricornia and Hancocks veneer mills so I could watch the machinery. The slicing machines held a special fascination for me as they magically produced thin consistent veneers amongst the steam and clatter of the mills.
Mobyturns
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28th October 2018, 04:04 PM #7GOLD MEMBER
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Very cool Rob. I think I'll end up leaving the wood as long as I can before I need it and hopefully it will at least be free of the free-water and starting to dry down to something reasonable before cutting veneers.
The veeners will be about 300mm x 700mm and if I plane one side before cutting I will hopefully be able to get any deformation out when gluing / pressing them onto the substrate timber - then plane / sand the surface to finish.
Cheers, Dom
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28th October 2018, 05:51 PM #8GOLD MEMBER
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Visited a veneer mill at the old Boyer site near New Norfolk about 20 years ago. They were cutting veneers green as can be, with a machine that looked like a massive paper guillotine with blades 5 or 6 metres long that sliced very quickly in repetition. Once the veneers were cut they went onto conveyor belts and spent a few minutes passing through a fan forced drying kiln before being stacked in order on the other end of the kiln, bone dry.
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28th October 2018, 08:03 PM #9SENIOR MEMBER
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The commercial veneer mills I have seen all slice their wood green. They are producing veneers under 3 mm thick. The rotary veneer mill peels whole green logs basically straight from the bush. The slicing mill uses flitches that are softened in hot water for about a day before slicing. After slicing the veneers are dried in kilns as AB described above.
TonyYou can't use up creativity. The more you use, the more you have. ~Oscar Wilde
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