This problem is generally encountered when gears have continued to run for number of contacts exceeding 1010 cycles without any scuffing takes place. When the film lubrication breaks down due to rolling and sliding of gears, the contact temperature at the point of contact increases to such an extent that welding can take place and in further rotation, the weld separates. In this way, scuffing mark appears and scuffing takes place.
For gears to rotate in mesh with each other, a certain amount of clearance between them is required this clearance is called backlash. If the gears are tightly mesh with no clearance, the lubricant that should be between gears is displaced and rapid wears leads to catastrophic tooth failure and if the clearance is larger than recommended, the gear teeth will hammer against each other and ultimately destroy gear teeth.
1 comment:
kindly post the details as to how the hob cutter is centered as to have a true profile gears
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