 | Draft a print to verify adherence to the
original bearing configuration and tolerances. |
| Address any modifications needed |
| Determine
and specify proper operating clearances, shaft size and seat
dimensions. |
| Dimensionally check the housing, ball
fits and/or spherical ring fits to OEM specifications. |
| Check insulation, if applicable |
| Machine out the existing Babbitt to
avoid distortion |
| Clean the existing housing |
| Evenly heat the bearing shell to the proper
temperature |
| Pre-tin the bearing shell to provide for
the strongest adhesion of Babbitt |
| Heat the virgin Babbitt to the proper
temperature for each grade specification |
| Centrifugally cast the bearing at the
proper OEM recommended speed |
| Check the horizontal joints for proper
percentage of contact. |
| Ream all dowel holes to insure proper
bearing half alignment. |
| Replace dowel pins if necessary. |
| Rough machine the bearing bore and perform
ultrasonic bond inspection to determine the integrity of the Babbitt
bond. |
| Minimum acceptable bond is 95% total Babbitt
area and 95% in
the load carrying (middle 1/3 of the bottom half) area
|
| Re-insulate the bearing, if necessary, and
mega check. |
| Final machine the bearing bore
to the finish bore diameter or journal size
and clearance as provided by the customer. |
| Final machining tolerance should be held to
within .001". Maximum taper in the bore is .001" per foot |
| On thrust bearings, the thrust mount
must be perpendicular to the bearing bore within .001" |
| Machine relief's in the bearing and
install proper angles on the relief edges for optimum oil
circulation. |
| Tap and die all the threaded connections.
|
| Perform quality control checks by a
machinist and inspector independent of each other. |
| Documented final inspection for "As
Release" report for the customer |
| Paint all exposed surfaces.
|
| All non painted, non Babbitt surfaces are
to be coated with lubricant for surface rust protection.
|
| Ultrasonic Certificate and Certificate of
Conformance showing test results is to be furnished |
Babbitt Bearing Repair and Manufacturing 
