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  1. 15th November 2007, 01:28 PM #1
    starr
    starr is offline Member
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    Angry Trouble with Nyatoh

    I have been working with nyatoh rough-sawn boards which I planed flat and then ran through the thicknesser to get down to 20mm thick.

    The wood was fairly dry according to my moisture metre (about 12%, which was the same as other wood I had around the place and know to be dry).

    After going back to the boards after a couple of days I found that several are no longer flat across their width but have a decided S shape to them (although only about a mm or so out of flat).

    Has anyone had a similar problem and how do I prevent it in future?
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  2. 15th November 2007 01:28 PM # ADS
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  3. 15th November 2007, 01:40 PM #2
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    Did you leave them lying flat on a bench so they were only exposed to the atmosphere on one side? That's a common cause. Also, some wood (particularly back-sawn) is going to cup whatever you do.

    You could try damping the concave side and setting the wood on stickers to allow all-round exposure. Or try damping and clamping the wood flat.
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  4. 15th November 2007, 05:35 PM #3
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    What brand of moisture meter did you use? Pins or pinless?
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  5. 15th November 2007, 05:37 PM #4
    rsser
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    And bear in mind that accuracy in moisture readings depends on adjusting the apparent value for the wood species. Bootle has a calibration table.
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  6. 16th November 2007, 09:52 AM #5
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    jaspr
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    It is also best if you take equal amounts off both sides to equalise the moisture - taking it all off one side opens up fresh and possibly damper wood on one side only - this increases the risk of cupping.
    "... it is better to succeed in originality than to fail in imitation" (Herman Melville's letters)
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