Posted by Bill S. on October 10, 2002 at 01:29:58:
In Reply to: Material for gear posted by Mike Tate on October 04, 2002 at 08:56:56:
Dennis raises a good point with a possible lead error.
If you don't have a lead checker, you can do this: Lay a left and right gear set on a flat surface (granite surface is good). Push them tightly into mesh and hold one of the members tightly to the surface. Observe if the other twists and lifts off the surface. A dial indicator on its face will show the amount of "lift". This is a quick way to see if there is any significant lead error between the two gear members. This test can also reveal gear cutting and gear blank misalignments.
Also, lead error will cause a wear pattern like this: Under moderate load and tight mesh, wear will occur on one tooth flank near one face, and equally on the opposite tooth flank at the other face. As load increases, wear will lessen near one of the faces and increase near the other if the lead error is slight. If you apply bluing and perform this test, you can quickly see how the wear pattern would look.
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