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Purchasing dimensioned timber - tolerances?

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  • 14-04-2019 11:12am
    #1
    Swift66
    Registered Users Posts: 139 ✭✭


    Hello,

    I ordered my first pieces of dimensioned timber from 2 timber suppliers in Dublin /Kildare. (I've only ever bought rough / PAO from builders providers & rough from timber suppliers before)

    Anyway, what was supposed to be 18mm thick is 17.6mm in one instance (walnut) and in others what should be 20mm is 19.5mm (oak & beech)

    So 0.5mm out in thickness - Is this usual in your experience?

    I find it really annoying, obviously 0.5mm over would be much better.

    Thanks


Comments

  • Options
    #2
    [Deleted User]
    Posts: 3,637 ✭✭✭ [Deleted User]


    Swift66 wrote: »
    Hello,

    I ordered my first pieces of dimensioned timber from 2 timber suppliers in Dublin /Kildare. (I've only ever bought rough / PAO from builders providers & rough from timber suppliers before)

    Anyway, what was supposed to be 18mm thick is 17.6mm in one instance (walnut) and in others what should be 20mm is 19.5mm (oak & beech)

    So 0.5mm out in thickness - Is this usual in your experience?

    I find it really annoying, obviously 0.5mm over would be much better.

    Thanks

    If .4-.5mm bothers you at this stage, wait until it acclimatises and see how annoyed you’ll be.

    Dimensioned hardwood is not to be considered a finished dimension when you order it. Always add something to allow you take it down to final dimension.


  • Options
    #3
    kadman
    Moderators, Home & Garden Moderators Posts: 5,057 Mod ✭✭✭✭kadman


    I think you probably got industry standard tolerances there.

    +/- .5 mm is good by any stretch of the imagination. If you wanted better you

    probably should have specced more material.


  • Options
    #4
    [Deleted User]
    Posts: 3,637 ✭✭✭ [Deleted User]


    Just on the shrinkage thing, have a read of this:

    https://www.wood-database.com/wood-articles/dimensional-shrinkage/

    I can recommend the book also. Very useful to have, if you like books :)


  • Options
    #5
    recipio
    Registered Users Posts: 2,804 ✭✭✭recipio


    You simply can't trust nominal tolerances - the only way to be sure of dimensions is to buy it rough and machine it yourself.


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