TS flatness fanatics?
Many years ago I did a lot of work as a machinist where very close tolerances were the norm in a day's work. Like +/- .0001. Now I'm hearing all this dialogue about TS tables that need to be within .001" of true flat. I'm reading in this forum that one should never use a grinder to remove rust from an iron machine table because it will compromise the flatness of the table.
So here's one for the experts: Just how important is +/- 001" tolerance when we're working with wood that will shrink/grow more than that with a shift in the weather? I build furniture in which close (for woodworking) tolerance is essential, but +/- .001"?
Also, not every having been exposed before to the importance of maintainingg a TS table to that of a precision milling machine, I've been using a 7" grinder and 180 grit (on a foam-backed wheel) on my old TS for some 40 years now. Today, I checked it with a machinist's straightedge (18") and I could not see even a hiint of daylight under the straightedge anywhere. Granted, I've been careful to use even pressure and never use the edge of the wheel, but even so, I did use a grinder. That poor old TS has lived a few blocks from the ocean for the last 20 years, and I occasionally forget to spray on the WD-40 when I'm not going to use it for a few days. That's all it takes for another ugly accumulation of rust.
So anyway, just how important are these tolerances? I can understand the need for close tolerances on parallelism of components and in the flatness of the rip fence, but please give us some Real Wisdom on this table-surface thing.
are far less dangerous
than Unquestioned Answers.