tailstock4
Cast Iron
- Joined
- Mar 3, 2013
- Location
- Oklahoma, USA
I haven’t posted much but here it is. I’m replacing the spindle bearings on this Rivett and have a question about preload. The preload is set by the inner and outer spacers. The following is my method of determining preload clearance. My questions are does this method seem okay and do the following results of the original clearance seem reasonable.
* First I ground two spacers on both sides.
* Placed one spacer on a surface plate.
* Took the flanged angular contact bearing and put it face down so that the thrust was correct.
* Next placed the outside spacer on the outer race with the back angular contact bearing set so that when the last spacer I made is sitting on the inner race it is all in the direction of loading.
* Then I took gauge blocks to get the height checking with a .0001 indicator sliding back and forth between the stacks until it read zero. This is the total stack height.
* I subtracted the following from the total stack height: My two spacers, the spindle inner spacer and the inner races of the bearings.
* This gives me a clearance of .00235 using the original bearings.
* Used the same method with the new bearings and came up with a clearance of .00525.
* This means a difference of .0029 to be ground off the outer race.
Does the clearance of .00235 sound about right for the original clearance?
Does this method sound right for arriving at the original clearance?
The original bearings are New Departure 0L12DTX7038 and outer race is marked T3TT.
New bearings are marked: Front bearing 0L12DTX7. Back bearing is marked QN0L12DTX7. These are duplex back to back.
Any help or advice would be appreciated. Thanks.
* First I ground two spacers on both sides.
* Placed one spacer on a surface plate.
* Took the flanged angular contact bearing and put it face down so that the thrust was correct.
* Next placed the outside spacer on the outer race with the back angular contact bearing set so that when the last spacer I made is sitting on the inner race it is all in the direction of loading.
* Then I took gauge blocks to get the height checking with a .0001 indicator sliding back and forth between the stacks until it read zero. This is the total stack height.
* I subtracted the following from the total stack height: My two spacers, the spindle inner spacer and the inner races of the bearings.
* This gives me a clearance of .00235 using the original bearings.
* Used the same method with the new bearings and came up with a clearance of .00525.
* This means a difference of .0029 to be ground off the outer race.
Does the clearance of .00235 sound about right for the original clearance?
Does this method sound right for arriving at the original clearance?
The original bearings are New Departure 0L12DTX7038 and outer race is marked T3TT.
New bearings are marked: Front bearing 0L12DTX7. Back bearing is marked QN0L12DTX7. These are duplex back to back.
Any help or advice would be appreciated. Thanks.