Cylindrical grinding

[mhh]

I'm sitting here drawing a cylindrical grinding accessory for my Astra AR5 grinder and before I can get much further I need to find out more about what speed range it need to run in? any guesses or pure knowledge? Come on guys I know that some of you are old machinists and know EVERYTHING! Hehe

[Bernd]

For internal I'd think you'd want in the nieghborhood of 18,000 to 30,000RPM. Much slower for external grinding.

Bernd

[mhh]

Perhaps I need to clarify a bit. The item in question is what holds to part to be ground so my question is not about the grinder spindle speed, but what speed the part should rotate?

[Bernd]

Back when I worked in the grinding department were I was employed I recall the part usally turned slower. Depending on diameter any were from 50 to 200 RPM.

Bernd

[mhh]

Back when I worked in the grinding department were I was employed I recall the part usally turned slower. Depending on diameter any were from 50 to 200 RPM.

Bernd

What kind of parts was that? large or tiny? what I've discovered so far is that hardened material should rotate with a surface speed at 3m/m when finishing and 8m/m when roughing. So I'm thinking a speedrange somewhere from 10 to 100? does that sound totally ridiculous?

[Bogstandard]

When grinding on my lathe, internal or external, I always use the slowest speed, which is 65 RPM.

This allows very fine surface finishes.


Bogs