Fibonacci
Member
So I finally got my proper live center and decided to try turning one of my CSUSA classica kits last night with some acrylester I picked up at the same time.
Given that I had determined the bushings I bought to be slightly eccentric, I tried to turn the kit with my calipers. I noticed as I went along that I had to keep tightening the tailstock to keep it from spinning. When I finally got to nominal, I pulled the blank off to clean the ribbons that had collected on the ends.
At this point, I discovered that the tubes were very flared and had rubbed a reasonable amount of copper off on the live and dead centers. Unfortunately, I don't think the kit is recoverable, and the blank had cracked on one end from the flaring.
So, where did I go wrong? The obvious problem is that I had too much pressure on the tube, but I only tightened it when the blank started spinning freely between the centers.
Are the bushings needed for the main shaping to make the load be purely compressive rather than partially compressive and partially radial? Any other suggestions for fixing this?
I didn't have any other problems with the material, so that is nice at least. I had not worked with inlace acrylester before. It polishes really well. I decided to finish it for practice.
EDIT: I want to correct an impression I seem to have given. I have NOT had issues with CSUSA bushings. I have had issues with cheaper ones I bought at a discount vendor.
Given that I had determined the bushings I bought to be slightly eccentric, I tried to turn the kit with my calipers. I noticed as I went along that I had to keep tightening the tailstock to keep it from spinning. When I finally got to nominal, I pulled the blank off to clean the ribbons that had collected on the ends.
At this point, I discovered that the tubes were very flared and had rubbed a reasonable amount of copper off on the live and dead centers. Unfortunately, I don't think the kit is recoverable, and the blank had cracked on one end from the flaring.
So, where did I go wrong? The obvious problem is that I had too much pressure on the tube, but I only tightened it when the blank started spinning freely between the centers.
Are the bushings needed for the main shaping to make the load be purely compressive rather than partially compressive and partially radial? Any other suggestions for fixing this?
I didn't have any other problems with the material, so that is nice at least. I had not worked with inlace acrylester before. It polishes really well. I decided to finish it for practice.
EDIT: I want to correct an impression I seem to have given. I have NOT had issues with CSUSA bushings. I have had issues with cheaper ones I bought at a discount vendor.
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