It is really looking nice. 
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How do you measure this? Especially over such a span, I would not know how to make this measurement.
I think you can do this with a long enough (and straight-enough) straight-edge. But Iāll defer to the experts.
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Iāve got a true straight edge of 300cm, and a few decks of playing cards. The playing cards measure 0.3mm of thickness. I can put the ruler anywhere on the table, an nowhere iām able to slide a playing card under the ruler.
Thatās my simple measurement, iām sure some industrial experts will be able to prove me wrong ;-). But within my reach of measurement iām within 1 playing card thickness off, of true flat.
Top coat starts shining:
[attachment file=117886]
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Somewhere Iāve seen flattening woodworking tablea done this way, but they additionally put winding sticks at each end to look for twist. You can have some twist and pass the straight edge test. I donāt think it matters with the LR, since the machine is going to follow the twist anyway. I think that was probably from one of the Christopher Schwarz books on workbenches.
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Also, that is a beautiful table.
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@jeffeb3 twist will always show in the diagonal lines over the table. This is indeed measured. Winding sticks are mainly used on smaller objects where twist is less evident to be observed. The table top has a tiny fraction of twist that shows by the one diagonal allowing a slight shim of light under the ruler in the center, and the other diagonal showing a fraction of light under the tips of the ruler. This falls within a 0.2-0.1mm range as i can just slide a piece of thin paper under the ruler (with friction).
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And the table is finished (for now, in the future iāll add doors and drawers.) Now iām waiting for some parts i need (longer cables) to move the LR2 to its new home.
[attachment file=118082]
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Even if your drawers end up being boxes, you should use the CNC to make them.
That monster looks really awesome. I canāt wait to see what you build with it.
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Iād be so disappointed the first time I accidentally drove my bit below the spoil board if I had that nice of a tableā¦ Not that Iāve ever done that, mind you.
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Is that a birch log standing behind the table?
@Barry, nope its its better, itās Cherry
The same tree as where i made this plaque of:
[attachment file=118163]
Nice!
Today i āfinishedā setting up the Lowrider (not really finished yet as i still have some mechanical fine-tuning todo and i have ordered a 32-bit controller and LCD with touchscreen).
[attachment file=118431]
The final useable workarea is: 265x125 cm
[attachment file=118432]
Yesterday i designed a new Y-Belt system since i could not use the version by: Tailslide anymore for this set-up.
Main considerations:
-
Easy and precise to set-up with minimal belt waste:
[attachment file=118433] -
working fine ajustment for belt tension:
[attachment file=118434] -
Ajustable y-endstop bumpers to enable finetuning of āsquarenessā:
[attachment file=118435]
If there is interest iām willing to share the files.
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Please do share on thingiverse. Nice design.
Very interesting design thereā¦and love the tableā¦great job there !!!
Now time to enjoy it I guess.