Shaft coupler reinstall
Posted: Thu Mar 29, 2012 2:54 pm
For those that are interested, I cleaned up shafts with emory strip, inserted keys in keyway, then to reninstall I heated the coupler to 400 degree in oven. They tapped on with a brass hammer very easily. Watched in the set screw holes to get alignment and screwed in sent screws. It was a piece of cake. It helped having a vice that could hold the shaft verticle, of course using soft aluminum jaws in the vice.
Also for those that are interested there is a machinest standard I found to calculate the clearance at a given temperature, I assume for steel it is:
.0000064 X tempertaure = the amount in thousands of increased clearance. In my case worked out to .0025 at 400 degree which was adequate to facilitate the install without superhuman effort.
BTW if you were doing a pressed on bearing, which I have done, it was recomended to me to use no more than 250 degrees, I did and the bearing dropped on a shaft with no force and grease was intact.
Also for those that are interested there is a machinest standard I found to calculate the clearance at a given temperature, I assume for steel it is:
.0000064 X tempertaure = the amount in thousands of increased clearance. In my case worked out to .0025 at 400 degree which was adequate to facilitate the install without superhuman effort.
BTW if you were doing a pressed on bearing, which I have done, it was recomended to me to use no more than 250 degrees, I did and the bearing dropped on a shaft with no force and grease was intact.
