On 2/4/2015 4:55 PM, whit3rd wrote:
On Wednesday, February 4, 2015 at 4:07:33 AM UTC-8, dadiOH wrote:
wrote in message


... My aluminum miter gauge certainly scratches the top.

You have some remarkable aluminum (or wierd iron), aluminum is much softer
than iron. Here's a Moh's scale...

http://www.jewelrynotes.com/the-mohs...-is-important/

Anodized aluminum (aluminum oxide in a transparent form on the metal surface)
is also called corundum. Mohs scale, corundum is #9, and is quite a bit harder
than steel (4.5 or so).



And whether it matters or not, most of the equipment we are talking
about, that might be scratched, is cast iron, not steel. And cast iron
TS top are pretty soft.