Difference between contact pattern and mounting distance for a pinion gear?

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The discussion clarifies the difference between contact pattern and mounting distance for a pinion gear in differential rebuilds. Contact pattern refers to the wear pattern on the gear face, which is assessed using machinist bluing to ensure proper teeth contact and avoid noise. Mounting distance is the ideal dimension for pinion and carrier placement, which often differs due to manufacturing imperfections. Adjustments are made using shims to achieve the correct contact depth and backlash for optimal gear performance. Properly aligning these factors is crucial for minimizing gear noise and ensuring efficient operation.
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Hi
What is the difference between contact pattern and mounting distance pinion gear .
Is it possible for one to cancel the other?
Hi What is the difference between contact pattern and mounting distance pinion gear . Is it possible for one to cancel the other?
 
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when doing a rebuild on the differential, correct wear pattern must be determined for best results. We do not want gear noise or rear end noise caused by improper teeth contact between the differential side gears and the pinion gear teeth. We paint the pinion with machinist bluing ( cheap blue dye) and rotate the assembly. we then check wear pattern on the gear face. If not correct we shim the pinion to achieve proper pattern.
We also have carrier shims that adjust backlash. Both the pinion and carrier have a Nominal Mounting distance or the ideal dimension but due to manufacturing imperfections in the gear making process the ideal and the real world dimensions will almost never be the same so we use the bluing method to check wear pattern. By adding or removing shims we adjust the contact depth ( pinion shim) and backlash ( carrier shim) to obtain optimum gear contact.
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