Idea for fine grind/polishing spheres after coarse shaping
Feb 19, 2015 13:45:38 GMT -5
snowmom likes this
Post by jamesp on Feb 19, 2015 13:45:38 GMT -5
Looking at using the Viking 'tub type vibratory tumbler' . Making a new lid that has dividers so that 3 rough shaped spheres can be tumbled side by side in hard media.
The dividers are commonly used in tub type vibes that can be 3- 20 feet long in the industrial sector.
Dividers made of rubber or plastic, connected to a custom made cover, inserted from above to segregate the spheres.
Dimensions of opening is 11.5 inches X 3.5 inches. But the urethane liner could be opened a bit for a short distance at the mouth to allow a 4 inch sphere to pass.
So two 4 inch spheres and one 3 inch sphere could run at the same time in the Viking 14 pound hopper, dividers to keep them from hitting each other.
Presently running a full hopper of 5 mm garnets. They do well for laying a polish down on smaller tumbles when grit is added with them.
Today a 3 inch 'sphere' was dropped in with them as a test. It was tumbled smooth in the rotary using SiC 30/60. It also beat up the other tumbles when in the rotary.
It is rolling just fine in the vibe with the garnet media with SiC 220 grit. Which breaks down in one to three days normally imparting a nice polish.
The urethane liner will do fine with SiC 80 grit too, but not coarser.
Photo of hopper:
Cover is basically a flat plate and easy to reproduce. Good seal not necessary.
The dividers are commonly used in tub type vibes that can be 3- 20 feet long in the industrial sector.
Dividers made of rubber or plastic, connected to a custom made cover, inserted from above to segregate the spheres.
Dimensions of opening is 11.5 inches X 3.5 inches. But the urethane liner could be opened a bit for a short distance at the mouth to allow a 4 inch sphere to pass.
So two 4 inch spheres and one 3 inch sphere could run at the same time in the Viking 14 pound hopper, dividers to keep them from hitting each other.
Presently running a full hopper of 5 mm garnets. They do well for laying a polish down on smaller tumbles when grit is added with them.
Today a 3 inch 'sphere' was dropped in with them as a test. It was tumbled smooth in the rotary using SiC 30/60. It also beat up the other tumbles when in the rotary.
It is rolling just fine in the vibe with the garnet media with SiC 220 grit. Which breaks down in one to three days normally imparting a nice polish.
The urethane liner will do fine with SiC 80 grit too, but not coarser.
Photo of hopper:
Cover is basically a flat plate and easy to reproduce. Good seal not necessary.
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