Here are pictures of repairs made to a part of a sand muller used in foundry operations.

The original hub became a very loose fit on the shaft and ended up wearing against the 
bearing housing…to the point that it actually wore out the housing.  The front bearing 
had seized by virtue of the organizer cage in the tapered roller bearing wearing out.  The 
housing was too thin to accept a new bearing and no provision to keep the sand out of the 
bearing existed.

I machined the end of the bearing housing off, and created a new bore for the bearing 
race out of steel.  It was held to the cast housing by a 6-bolt pattern of socket head screws 
and 2 dowel pins to assure alignment.  I also developed a thin ring that uses the same 
dowel pins to locate a special oil seal that also has a grit shield in addition to the garter 
spring.

Next project was new shaft, made from O-1 drill rod, machined a new hub from the 
rough casting, and began the process of assembling, pressing the bearings, pinning the 
nuts, sealing the housing parts and lubricating.

M. G. Isserstedt
01 April 2006
mattofvinings ATTT aol DOTTT com