- Joined
- Dec 21, 2018
- Messages
- 48
While trying to fit a new back plate I was making for my collet chuck, I accidentally damaged the threads of the spindle of my dividing head. I had made a separate thread gauge to be able to fit plates I made without having to disassemble the dividing head and use the spindle itself. The fit was good on the thread gauge, but the actual fit on the spindle was JUST A little bit too tight towards the end, and the plate bound up. After eventually removing it, the threads were completely damaged due to galling.
My only option was to turn them off and add a sleeve to make new threads. I made a sleeve of stainless steel, oversized, and shrunk fit it to the spindle after machining the old threads off. I then added two stainless pins to ensure that the sleeve would never move.
After that I turned the sleeve to finish dimensions, then I proceeded to thread the sleeve, until the back plate for the three jaw chuck fit the spindle.
I then remade the back plate for the collet chuck that had damaged the spindle initially. It was much easier to fit it up with the spindle out of the dividing head! I had forgotten how easy it was to disassemble the dividing head, and if I ever need to make another backplate I will remove the spindle to use that as a thread gauge, instead of a separate one. Lesson learned!
Photos of the damaged thread, shrink fitting the sleeve, the pins in the sleeve, machining the sleeve to final dimensions, threading, the back plate for the chuck fit to the spindle, the new backplate I had to make for the collet chuck, and the collet chuck installed after the threads had been repaired.
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My only option was to turn them off and add a sleeve to make new threads. I made a sleeve of stainless steel, oversized, and shrunk fit it to the spindle after machining the old threads off. I then added two stainless pins to ensure that the sleeve would never move.
After that I turned the sleeve to finish dimensions, then I proceeded to thread the sleeve, until the back plate for the three jaw chuck fit the spindle.
I then remade the back plate for the collet chuck that had damaged the spindle initially. It was much easier to fit it up with the spindle out of the dividing head! I had forgotten how easy it was to disassemble the dividing head, and if I ever need to make another backplate I will remove the spindle to use that as a thread gauge, instead of a separate one. Lesson learned!
Photos of the damaged thread, shrink fitting the sleeve, the pins in the sleeve, machining the sleeve to final dimensions, threading, the back plate for the chuck fit to the spindle, the new backplate I had to make for the collet chuck, and the collet chuck installed after the threads had been repaired.
Sent from my Pixel 2 using Tapatalk
