- Joined
- Jun 23, 2016
- Messages
- 30
I finished restoring a 1939 Clausing Lathe some time back. The original chuck had .020" runout and was totally unusable. I really wanted to put a vintage chuck on the machine but couldn't find one locally and didnt' want to risk ordering one on eBay.... So I purchased a Shars 3-Jaw with removable jaws.
It arrived this afternoon and I had an opportunity to turn/face the backplate and install the chuck. The fit was absolutely a perfect interference fit. I bolted on the chuck and tested it with a .0005" indicator. I was getting around .0025 runout, which I was happy with. When I was attaching the backplate I noticed one bolt had a little trouble going in so I took a closer look. The bolt holes on the backplate weren't lining up perfectly with the chuck and I was getting some rubbing on the head of the socket head cap screw which canted the chuck very very slightly. So I ground down the head so there wasn't any interference and reinstalled.
After that runout on the chuck body was less than .0005". I threw a few test pieces in and the results are below. I re-chucked all different material and am getting the same results over and over. I can see almost no movement on the indicator. I'm guessing .0001-.0002 runout on this. At this price I'm absolutely blown away. I was expecting the worst.
Is this normal or did I get really lucky?
It arrived this afternoon and I had an opportunity to turn/face the backplate and install the chuck. The fit was absolutely a perfect interference fit. I bolted on the chuck and tested it with a .0005" indicator. I was getting around .0025 runout, which I was happy with. When I was attaching the backplate I noticed one bolt had a little trouble going in so I took a closer look. The bolt holes on the backplate weren't lining up perfectly with the chuck and I was getting some rubbing on the head of the socket head cap screw which canted the chuck very very slightly. So I ground down the head so there wasn't any interference and reinstalled.
After that runout on the chuck body was less than .0005". I threw a few test pieces in and the results are below. I re-chucked all different material and am getting the same results over and over. I can see almost no movement on the indicator. I'm guessing .0001-.0002 runout on this. At this price I'm absolutely blown away. I was expecting the worst.
Is this normal or did I get really lucky?