CHECKING FOR PARALLELISM
Parallelism between the face of the work wheel and the face of the regulating
wheel Is absolutely essential for uniformity of part diameter. If trial grinds
indicate that the faces of these two wheels are not parallel, corrective adjustment
may be made as follows.
NOTE: ALL ADJUSTMENTS MUST BE MADE WITH THE COMPLETE MACHINE STOPPED,
TO PREVENT INJURY TO THE OPERA TORS HANDS.
1. Determine diametral variance between the work wheel and the regulating
wheel at the extreme ends. In order to identify these ends, first mark
one end with a mark such as a saw cut.
2. Loosen the two (2) hold down nuts which secure the regulating wheel housing
to the ram just enough to permit moving the housing when the parallelism
adjusting screws are turned.
3. Back off the adjusting screw at the end producing the small diameter
part and advance the end producing the larger diameter part. For
example; assume that the part produced at the extreme left end of
the wheel has a major O.D. of .308 while the part produced at the
extreme right end of the wheel is .316 diameter, for a difference of
.008. Back off the adjusting screw at the left end .004 and advance
the screw at the right end .004.
Occasionally, tooling for the form grinder will be supplied by Glebar Co., Inc.,
with small lands extending from the regulating wheel side of the work rest
blade. Such tooling will normally be supplied only when presenting very small
diameter rods for form grinding. In such cases, it is necessary to design the
face of the regulating wheel with corresponding grooves to recieve these lands.
If the grooves in the regulating wheel do not align correctly to insure a
running clearance, it will be necessary to shift the regulating wheel housing
to the right or left as required to achieve such alignment.
This is accomplished by once again loosening the hold down nuts just enough
to permit housing movement when thE alignment screws are adjusted. These
two screws protrude from each outer end of the regulating wheel housing. Since
the screw butts up against the stud at the end, it can be seen that by turning
either screw, Inward (clockwise) will pull the housing out away from the stud.
Adjust as required an retighten the hold down nuts when desired alignment
Is acquired.