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Vertical Drilling Motor, Type GE752, GEK–91584D
17
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.