GE manual COMMUTATOR GRINDER. E±18249, Vertical Drilling Motor, Type GE752, GEK±91584D

Vertical Drilling Motor, Type GE752, GEK±91584D

FIG. 11. COMMUTATOR GRINDER. E±18249.

NOTE: For most applications, finish±grade resurfacing stones are recommended. Medium grade stones can be used for rough grinding a deeply grooved or threaded commutator, or a commutator with deep flat spots, followed by fi- nish±grade stones for the final grinding. If new stones will be used, they should be contoured on a Carborundum wheel to approximate the curvature of the commutator.

Install the stones in the grinder so the entire surface of the commutator will be resurfaced when the carriage is traversed from side±to±side. Proceed with alignment of the grinder as follows:

Install the resurfacing stones in the grinder and pro- ceed as follows:

1.Traverse the carriage to one end of the commu- tator and check the clearance between the com- mutator surface and one stone with a feeler gauge or a fiber strip (approximately 0.030 in. thick). Traverse the carriage to the other end of the commutator and check the clearance under the same stone. The clearance should be the same at both ends. If clearance is not equal at both ends, adjust the mounting bracket by means of the set screws to obtain equal clear- ance at both ends.

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