material for home grinder rollers

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vmpolesov

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I checked out this page
http://suburb.semo.net/jthornton/Mill.htm

pretty slick!

I like the idea of large dia. rollers and not having the difficulty of knurling.

Are there pros and cons of various materials for this application?

I happen to have plenty of 3.5" dia aluminum pipe on hand (thick walled, about 1/4" I'm guessing). I machine the pipe and endplates as needed, and MIG it all together. Just wondering if Al is a suitable material for this.

Is 3.5" large enough for no knurl? Where do you draw the line?
 
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