Post by Don on Oct 3, 2012 17:55:43 GMT -5
I was surprised to see that covington's flagship grinder setup still uses the old fashioned thumper wheel with SIC belts:
www.covington-engineering.com/combo_8_dia_pf.html
How are these to grind on? It looks like a nice machine otherwise, but I can't see getting something like this in place of a Genie or Titan setup. I guess you could throw an expando drum on there instead, but the way the machine is designed, you'd have to take it apart to change out belts.
The factory configuration appears to be 100 and 220 grit hard diamond wheels, 400g belt on the thumper, 1200 grit disk plate, and then finishing with 50K diamond on a leather pad. It's an interesting setup; 400 to 1200 strikes me as a big leap.
I bring this up because I was visiting a local shop that has purchased two of these units for lapidary classes they plan on having there. I wasn't quite sure what to make of these thumper wheels.
www.covington-engineering.com/combo_8_dia_pf.html
How are these to grind on? It looks like a nice machine otherwise, but I can't see getting something like this in place of a Genie or Titan setup. I guess you could throw an expando drum on there instead, but the way the machine is designed, you'd have to take it apart to change out belts.
The factory configuration appears to be 100 and 220 grit hard diamond wheels, 400g belt on the thumper, 1200 grit disk plate, and then finishing with 50K diamond on a leather pad. It's an interesting setup; 400 to 1200 strikes me as a big leap.
I bring this up because I was visiting a local shop that has purchased two of these units for lapidary classes they plan on having there. I wasn't quite sure what to make of these thumper wheels.
