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Differential Repairs Queensland and PNG

PHONE: All Hours
0417 733 050

Email Charlie on:
169csphdlr@gmail.com


Phone Charlie : 0417-733-050


 

 Diff Lapping

LAPPING, WHAT IS IT ?

Lapping, in an automotive differential, is a process where two gear surfaces are run together in a Gleason Lapping machine, using a medium of carborundum abrasive powder and oil which forms a paste solution, which in turn works on the contact surface areas. The two surfaces are the gear contact areas of the Crownwheel and Pinion.
The lapping process is achieved by setting up the crownwheel and pinion in the lapping machine in the same way that it would run in the differential.

The operator then observes the wear pattern and sets the machine to compensate and then completes the process using various techniques to reduce the high points of contact to the same level as the low points of contact, whilst maintaining the correct curvature of the tooth profile, and thus eliminating the cause of concentrated contact area. At the completion of the process, all sharp edges are ground (chamfered) to further improve the quality of contact between the two gears.


WHY LAP A CWP ?

The need to lap a crownwheel and pinion can be caused by many influencing factors, including, but not limited to:
 

  • Breakage of components. Vehicle loading.
  • Driving habits. Incorrect assembly.
  • Manufacturing faults. Result of roads conditions (flood, dust).
  • Worn bearings. Old age.

The quality of the results of re-lapping will be directly relative to the condition of the gearset prior to the lapping process, but in most cases should enable the gearset to provide long term, reliable service in a differential.

CAN ALL GEARSETS BE LAPPED ?

Our machine is capable of lapping hypoid and spiral bevel gears, but we need to maintain a comprehensive range of mountings. This also includes any gears that change the drive path by 90 degrees, or at right angles. It is important to note that lapping a gearset can only proceed if the specially trained operator can assess that the end result will be a serviceable gearset. Crownwheel and pinions that are badly worn or scuffed, (due to lack of oil or foreign matter), can be re-lapped, but the result may be less desirable. It is possible that gearsets with broken teeth can have the teeth welded back on and then the gearset re-lapped, but only in desperate cases.


CROWNWHEEL AND PINIONS , SKILLFULLY RE-LAPPED WILL PROVIDE AN INEXPENSIVE REPAIR AND/OR

THE NEED TO AVOID REPLACEMENT OF A GEARSET THAT MAY BE TEMPORARILY OR NO LONGER AVAILABLE.


DIFF LAPPING & REPAIRS P/L, BRISBANE
Contact us at: wshop@difflap.com.au