On 2/4/2015 6:07 AM, dadiOH wrote:
wrote in message

On Mon, 02 Feb 2015 20:40:28 -0600, -MIKE-
wrote:

On 2/2/15 6:46 PM, wrote:
On Mon, 02 Feb 2015 18:42:13 -0600, -MIKE-
wrote:

On 2/2/15 6:35 PM, wrote:
I certainly wouldn't use (any)
metal runners on my cast saw table.


Why?

scratches = rust

Kinda defeats the purpose of coating the cast iron.


1. Isn't cast iron much harder than aluminum?

Than anodized aluminum? Aluminum is certainly harder than Boeshield.
2. How is one smoothly polished, soft metal going to scratch anything
let alone a much harder metal?

It does. 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/



I will say that with enough repeated passes most anything will cause a
wear pattern on cast iron. I have those all over the place running
parallel to the blade and perpendicular to the blade. Parallel marks
from the miter gauges/sleds/wood. Perpendicular marks from the fence
support pad that slides across the back of the TS top, that is the low
friction plastic stuff. Anyway the wear marks are only visible you
certainly can't feel them nor are they more susceptible to rust.