DIYbanter - View Single Post

otforme (Charlie Self) wrote in
:

Nate Perkins notes:

(Doug Miller) wrote in
.com:

Gotcha. And quoted directly from that page:
"Product Description Specifications: Edge straightness .0002" per
foot."

Sheesh.

0.0002"=5 microns off straight over a foot
0.002"=50 microns off straight over a foot

For reference, a human hair is about 100 microns thick. Talk about
splitting hairs.

And anyone who REALLY gets their tools set up to .002" is way past
where they need to be when working wood.

Yeah, my point exactly. Most people have no concept how small 0.0002"
really is. You can't see 0.0002" with your eye. You can't reliably see it
with the best optical microscopes. It's so small that any amount of
routine handling will throw it out of tolerance.

So why pay extra for 0.0002" tolerance in Starrett vs 0.002" tolerance from
Lee Valley? Beats me.