Lost of Angle

[mongui]

Hello,
Recently I come with an stone that I had half cut and when I tried to finish I couldn’t find the angle. Since this stone I started on summer and where I cut is very hot (it can go until nearly 40 degrees celsius).

What happens is that one very hot day on summer I start pre-polishing and then i left the stone (since it was way to hot to keep working on the stone), now I tried again and there’s no way to find the proper angle (I keep notes of each time I use the cheater, etc.). I took the dopped stone out and to me it seems that is slightly bend.

QUESTION: Could be possible that when in summer I tried to pre-polish, I apply too much pressure and with the high temperature the wax was soft and slightly moved?

Any ideas?

thank you,
Mongui

[Frankwood]

Hi Mongui,
I don’t think 40c is going to soften the wax on your stone. Most likely you are running the machine far to fast and applying to much pressure on pre-polish, thus generating heat making the wax soft.
You can salvage the situation and carry on cutting the stone, using a BBQ lighter and the machine dial gauge.
Use the lighter to heat the dop enough to soften the wax and straighten the stone up by eye. Put the dop back in the chuck and set the machine to 90deg, rest the stone on the lap and using the dial gauge find the highest spot on the stone. Gently heat the dop with the lighter and press it down, noting the dial gauge position. Rotate the stone round to the new high point and repeat the heating process, eventually the stone will be central on the dop.
Recut the stone.
Frank.

[mongui]

Thank you very much for your reply. I’m going to try to re-cut by using your advice.
Thanks a lot.

[Author]

Posts