Message:

<p>[QUOTE=&quot;springfld.arsenal, post: 267903, member: 54&quot;]I read an ad by Starrett, a fine old instrument-maker preferred by many machinists, regarding surface plates.&nbsp; They say a high quartz content is important to the life expectancy of a granite surface plate.&nbsp; High quartz content preserves the flatness, otherwise sliding steel instruments on it day after day will wear it so it either has to be discarded or re-ground and re-certified, not inexpensive processes.&nbsp; Mine is, like almost everything I have, &quot;previously owned&quot; and I have yet to put the precision height gauge on it to check the flatness.&nbsp; I think unless it has been abused for years, it&#039;ll be good enough for my purposes; my work doesn&#039;t have to pass any government inspectors.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in