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  1. #1
    Join Date
    Apr 2003
    Location
    Bacchus Marsh
    Posts
    140

    Default Cupped Redgum Slab

    I have had a 2.5 by 1.4 metre by 40mm Redgum slab for some time. It is a beautiful slab, full of fiddleback, great colours and features.

    It had been well air dried, when I bought it the moisture content was around 10%. It has been in my shed for the last 8 months and was finally bought into the workshop.

    I wanted to level it and built a leveling jig, as previously described by someone else on this bulletin board. To get a reference flat surface I put the slab on two 19 mm thick MDF boards. The slab did not have much in the way of twist etc, it just needed to be leveled before sanding.

    Unfortunately I forgot about the impact of having different conditions on either side of the slab. During that hot day last week my lovely Redgum slab cupped. I was devastated.

    I looked at the archives in this bulletin board and found some stuff about putting cupped slabs on the grass etc. this struck me as a pretty severe measure. I talked to some experienced people in Daylesford who suggested putting damp towels on the cupped side to allow the tensions to re-equilibrate.

    Ta Dah!!! Overnight the slab went from being cupped to going almost completely flat again. I ensured that it didn’t happen again by raising the slab on 4X4 sticks.

    I think that this slab is essentially stable, it didn’t cup during the whole time in the shed, only when I managed it incorrectly.
    Suresh

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  3. #2
    Join Date
    Sep 2003
    Location
    Kyabram
    Age
    45
    Posts
    969

    Default

    phew!
    Great tip thanks.

    Ben

  4. #3
    Join Date
    Oct 2003
    Location
    melbourne
    Age
    67
    Posts
    939

    Default

    Red Gum slabs often miss behave very unstable stuff.

  5. #4
    Join Date
    Nov 2001
    Location
    Wallan, VIC, Australia
    Age
    59
    Posts
    377

    Default

    That would be a relief seeing it come good again.

    BTW, If a 4x4 is a stick I'd hate to see what you consider a branch
    Ray

  6. #5
    Join Date
    Oct 2003
    Location
    melbourne
    Age
    67
    Posts
    939

    Default

    I flatern and take the twist out of my slabs with a Lucas Mill. Its quick just wedge so it doesn't wobble and cut the top off, flip and cut the bottom off then sand.

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