User Guide

E ffect of Lubrication on Micro-inch Finish
Lubricants affect the finish as well as the rate of cut. Dry
grinding produces the coarsest finish. Oils produce a finer
finish, and grease provides the finest finish.
E ffect of Lubricant on Finish
When a lubricant is applied to the belt, the areas between the
mineral are filled somewhat by the lubricant. This keeps the
mineral from penetrating into the workpiece as far as it would
when dry grinding. The thicker the lubricant, the less the
penetration, thus making a fine finish with the addition
o fg r e a s e .
E f fect of Lubrication on Buffing Ti m e
Applying oil or grease to the belt for a polishing operation
reduces buffing time. Agreased belt cuts buffing time in half as
compared to a dry belt.
P re s s u r e Pro g r a m m i n g
It is highly desirable, naturally, to achieve as constant a cut as
possible. The search for a way to achieve consistency in cutting
has led to a technique called pressure programming.
This chart indicates the trend of three factors in relationship to
the amount of stock ground. The three factors are rate of stock
removal, grinding pressure, and motor load.
Notice that grinding pressure is increased as the belt ages . . . in
order to maintain a near constant cut. Eventually, a point is
reached where pressure can no longer be increased, and
continued use of the belt is not economical.
Actual values for this type of programming must be determined
by in-plant production tests.