New grinding wheel allows coarse grind in 2 days
Jun 21, 2017 18:22:35 GMT -5
droseraguy, 1dave, and 2 more like this
Post by jamesp on Jun 21, 2017 18:22:35 GMT -5
SiC 30 grit, clay, 55 RPM. Finer diamonds on grinding wheel leaves shallow scratches. 2 days of SiC 30 and they are gone. But it still cuts super fast considering finer diamonds.
Before grind, finger on subject. Rio moss:
After 15 minutes pre-grinding two days ago Monday:
After 2 days in 3/4 cup SiC 30, clay, 55 RPM, 6 pound 6" PVC rotary barrel. Dry. Nary a scratch left.
2 days in AO 80 in vibe and 18 hours in AO 14,000 all w/Borax and she'll be shinning. 5 day tumble.
and not to bad wet:
This stone was ground on another diamond wheel. Has bigger diamonds but they are dull and cut one tenth as fast as the finer sharp diamond wheel.
Tumbled exactly the same as the red moss above.
Note serious scratches still left. Bigger diamonds, deeper scratches, but slow cutting due to dull diamonds and much more pressure required. Much more.
But only 30 RPM which may have a bearing.
The other barrel turning 55 RPM had this palm in it. Best palm I found on the Rio. ~15 minutes pre-grinding also Monday:
Dry, darn cracks though:
Not too bad, wet:
This is the five big rocks, each in a 6 pound barrel with average size tumbles. The top 3 at 30 RPM, the lower 2 at 55 RPM.
Four of them were ready to go to vibe in AO 80, the polish. The small tumbles a long ways from being shaped.
All 5 dry, the big one at upper right still has some scratches in the red area. 2 days SiC 30:
wet:
Rubber guide wheel ground to mate better to edge of tumbler. the edge of the wheel was cutting into the PVC a bit:
When 3 barrels are running on this set of shafts and gas makes the rubber caps swell it pushes the end barrel into the Zerk fitting lol.
strange moth on the spare v-belt simulating a broken limb, attached sorta at a right angle like a broken limb:
Going to run them another 2 days. I thickened the slurry. This will reduce the bumping and remove the tiny white impact marks.
Letting them dry tells a lot about their condition.
the glue is missing in some ares. Can not grind or tumble away. Runs throughout rock. Typical of these chalcedony filled shocked rocks.
Thanks for looking in.
Before grind, finger on subject. Rio moss:
After 15 minutes pre-grinding two days ago Monday:
After 2 days in 3/4 cup SiC 30, clay, 55 RPM, 6 pound 6" PVC rotary barrel. Dry. Nary a scratch left.
2 days in AO 80 in vibe and 18 hours in AO 14,000 all w/Borax and she'll be shinning. 5 day tumble.
and not to bad wet:
This stone was ground on another diamond wheel. Has bigger diamonds but they are dull and cut one tenth as fast as the finer sharp diamond wheel.
Tumbled exactly the same as the red moss above.
Note serious scratches still left. Bigger diamonds, deeper scratches, but slow cutting due to dull diamonds and much more pressure required. Much more.
But only 30 RPM which may have a bearing.
The other barrel turning 55 RPM had this palm in it. Best palm I found on the Rio. ~15 minutes pre-grinding also Monday:
Dry, darn cracks though:
Not too bad, wet:
This is the five big rocks, each in a 6 pound barrel with average size tumbles. The top 3 at 30 RPM, the lower 2 at 55 RPM.
Four of them were ready to go to vibe in AO 80, the polish. The small tumbles a long ways from being shaped.
All 5 dry, the big one at upper right still has some scratches in the red area. 2 days SiC 30:
wet:
Rubber guide wheel ground to mate better to edge of tumbler. the edge of the wheel was cutting into the PVC a bit:
When 3 barrels are running on this set of shafts and gas makes the rubber caps swell it pushes the end barrel into the Zerk fitting lol.
strange moth on the spare v-belt simulating a broken limb, attached sorta at a right angle like a broken limb:
Going to run them another 2 days. I thickened the slurry. This will reduce the bumping and remove the tiny white impact marks.
Letting them dry tells a lot about their condition.
the glue is missing in some ares. Can not grind or tumble away. Runs throughout rock. Typical of these chalcedony filled shocked rocks.
Thanks for looking in.