Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[lithicbeads]

I stopped just before break-through on the one hole to show you what we used to look for with the old diamond drilling on big holes  To prevent break-out, we would grind down to meet the rest of the hole, but the ultrasonic doesn't cause break-out.  I'm using a very large ball bit to  chamfer the holes.  Washington jade.

[R.U. Sirius]

Interesting! Is this setup similar to that used in ultrasonic machining of cameos? Is there an abrasive slurry involved, or the tool comes with fixed abrasive?

[lithicbeads]

Same tool.The cameos are carved in wax and cast in bronze then the bronze master is soldered to a horn instead of a bit.They form degrades as the bronze bit wears and the ones cut early in the run are considered more valuable. The ground forms are typically chased by a carver after tumbling to sharpen them up for the more expensive ones. It uses a sic slurry and hammers the grit into the stone.

[Felicia]

Thanks for the article. Interesting to see different tools.