03-25-2017, 02:36 AM
You will not regret having a good SG-250 grinding wheel. For decades it has been the main Tormek grinding wheel, and for most of that time, the only Tormek wheel.
The original Tormeks used a natural grinding wheel mined from a Swedish island. The SG man made aluminum oxide gradually replaced these. The SG wheels cut more quickly, but had a coarser 220 grit. I believe the original thinking with the stone grader was to give the user the chance to regrade the SG to cut like the natural stones.
Eventually the SB blackstone for harder steel and the 4000 grit SJ Japanese stone were added. I believe we will eventually see other grinding wheels from Tormek. This is strictly my opinion, based on no inside knowledge.
The SG does a very nice job on carbon steel. It is well worth your time to restore it.
Ken
The original Tormeks used a natural grinding wheel mined from a Swedish island. The SG man made aluminum oxide gradually replaced these. The SG wheels cut more quickly, but had a coarser 220 grit. I believe the original thinking with the stone grader was to give the user the chance to regrade the SG to cut like the natural stones.
Eventually the SB blackstone for harder steel and the 4000 grit SJ Japanese stone were added. I believe we will eventually see other grinding wheels from Tormek. This is strictly my opinion, based on no inside knowledge.
The SG does a very nice job on carbon steel. It is well worth your time to restore it.
Ken