Advice on a Craigslist Atlas 618

First, when speaking or writing about a normal tapered roller bearing, you should use the terms Cup and Cone unless you are speaking or writing about the two together.

The inner race of the cone should be pressed solidly up against the shoulder of the register flange BEFORE you start the installation of the spindle into the headstock. When you drive the spindle out of the headstock, the large cone brings the right dust cover out with it. It is possible that that's what moved the large cone away from the shoulder. But if when you put it back together your first time, the threaded collar ended up in about the same place as it was when you took it apart your first time, it wasn't put together right the last time before you bought it.

I don't know the diameters involved but step 1 is to get someone to machine an installer from a piece of heavy wall mechanical tubing with an ID at the end that's going to be pushing against the cone inner race of 0.010" to 0.030" larger than the ID of the large cone. Length over all should be 1" to 2" longer than from the cone inner race to the end of the spindle with the cone against the shoulder. And make a shouldered disk same OD as the tubing and slip fit in the ID at the pushing end to use to push against.

Put your spindle nose thread protector on the spindle nose and take spindle and installer to someone with a 25 ton or larger hydraulic press and get them to push the bearing against the shoulder.

Then put the thing back together following the instructions in the 6" headstock Technical Bulletin in Dowhloads.
 
wa5cab said:
First, when speaking or writing about a normal tapered roller bearing, you should use the terms Cup and Cone unless you are speaking or writing about the two together.

The inner race of the cone should be pressed solidly up against the shoulder of the register flange BEFORE you start the installation of the spindle into the headstock. When you drive the spindle out of the headstock, the large cone brings the right dust cover out with it. It is possible that that's what moved the large cone away from the shoulder. But if when you put it back together your first time, the threaded collar ended up in about the same place as it was when you took it apart your first time, it wasn't put together right the last time before you bought it.

I don't know the diameters involved but step 1 is to get someone to machine an installer from a piece of heavy wall mechanical tubing with an ID at the end that's going to be pushing against the cone inner race of 0.010" to 0.030" larger than the ID of the large cone. Length over all should be 1" to 2" longer than from the cone inner race to the end of the spindle with the cone against the shoulder. And make a shouldered disk same OD as the tubing and slip fit in the ID at the pushing end to use to push against.

Put your spindle nose thread protector on the spindle nose and take spindle and installer to someone with a 25 ton or larger hydraulic press and get them to push the bearing against the shoulder.

Then put the thing back together following the instructions in the 6" headstock Technical Bulletin in Dowhloads.
Click to expand...

Thank you very much... you have been the single best resource on this subject. I'm grateful.


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Ok after reading your suggestion, I had some pipe that fit the bill. It was supported on both ends and took very little pressure from the press to move it back to the shoulder (I was using my finger to increase the ram on my shop press). Anyways, all is well and put back together and running smoothly. I was surprised it too so little pressure. I don't know if that's a bad thing, but it works.
 
OK. That sounds all OK The large spindle bearing cone is supposed to be a light press fit on the spindle. I was afraid that it was tighter than that.
 
Nice thread Troye . I'm picking up an identical lathe to your's this weekend . It's fully tooled also . I'm following your progress . Dave .
 
Heh...I know that machine. It was for sale in Farmville or Powhatan or somewhere in that area. I had talked to the seller when it was listed and if he hadn't been out of town that weekend I was driving up to Richmond and back, it probably would have ended up in my garage! :) That was a sweet deal you got!
 
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