Post by wader on Feb 4, 2018 21:19:05 GMT -5
I recently purchased a set of 1-1/2" core bits to use as rough cups for my sphere machine. Until now I have been using pvc cups with 50 grit diamond pads to round out my preforms. It was a very time consuming process, not to mention the wear on the pads. I was always having problems with keeping the spheres true.
I installed the new bits and was surprised to find that my cups were way out of alignment! With the pvc cups it was hard to tell how far out of whack they actually were. They were +- 1/4" out! Thus the eggy spheres.
I re-aligned the cups, and ran through some preforms I had kicking around. The first one was pretty soft and only took about 45 seconds to be spherical! Checked with the callipers, and was less than .5mm out on a 2" sphere. I ran through the rest, the longest being a rose quartz preform, that was probably the worst preform I've ever made, at around 15 minutes.
I'm ordering some 3" core bits for my bigger spheres (3"+). I can't believe how fast they round out my preforms. I've run through a couple of really rough 4" preforms with the 1-1/2" core bit with great results, but lots of babysitting for the first 5-10 minutes.
I'm making a start to finish video of a sphere process that I will post soon.
I installed the new bits and was surprised to find that my cups were way out of alignment! With the pvc cups it was hard to tell how far out of whack they actually were. They were +- 1/4" out! Thus the eggy spheres.
I re-aligned the cups, and ran through some preforms I had kicking around. The first one was pretty soft and only took about 45 seconds to be spherical! Checked with the callipers, and was less than .5mm out on a 2" sphere. I ran through the rest, the longest being a rose quartz preform, that was probably the worst preform I've ever made, at around 15 minutes.
I'm ordering some 3" core bits for my bigger spheres (3"+). I can't believe how fast they round out my preforms. I've run through a couple of really rough 4" preforms with the 1-1/2" core bit with great results, but lots of babysitting for the first 5-10 minutes.
I'm making a start to finish video of a sphere process that I will post soon.
but it came to a great conclusion.
