Reply by Loren

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Posted on How flat is flat enough - Table saw

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10244 posts in 3611 days

#1 posted 04-04-2012 05:38 PM

You can grind it by hand if you want to invest several dozen
more hours in it. Lots of fun.

Seriously though, cast iron is soft enough to be scraped
and certainly filed. You can glue a sanding belt or other
large piece of sanding cloth to a flat man-made board,
piece of metal or whatever is flat and move that over
the high spots. Just like a plane, that sanding board
will take off the high spots and leave the low spots.

The warpage may not throw off your work in any significant
way so unless the warped table is keeping you awake
at night thinking about it, you might want to try to
live with it.

Your idea about straightening the table with a bending
jig is a good one. Cast iron jointer fences for example
are sometimes bent and are not hard to straighten using
a similar method.

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