User Guide

Guidelines for Gri n d i n g
D i s c l a i m e r
Keep in mind that in isolating the effects of a particular
variable, all other factors have been kept constant. W h i l e
t h i s may be possible in carefully controlled laboratory
a n d field tests, it is not always possible in an actual
production situation.
R e s u l t s
Knowledge of the effects of these variables will help to
obtain optimum results. This knowledge will allow you to
vary and manipulate them to maximum advantage. T h e
charts on the following pages highlight these variables and
the various effects they obtain.
Based on carefully controlled laboratory and field tests, 3M
has created a number of equations which indicate the “trend
e f fect” of variables present in abrasive usage.
In the tests, we attempted to isolate a particular variable,
keeping all other factors constant. Since this is not always
possible in an actual production situation, you should use
these charts as helpful guides in studying a grinding
problem. You should view the results as trends, and not as
concrete relationships. It is important to keep this in mind as
you examine the charts.
Va r i a b l e s
To achieve the above objectives, it’s essential to be aware of
the variables which affect them. These include the properties
of the piece being worked, grade, belt sequence, belt speed,
contact wheel diameter, resilience, effect of serration and
serration angle, type of lubricant, if any, and pressure.
THE OPTIMUM METHOD
There is rarely one given, recommended way to handle a
particular grinding job. There are usually many diff e r e n t
ways to approach a job. Ty p i c a l l y, grinding is done with
coated abrasives. And the general goal is to achieve the best
possible results with the least possible outlay of time, money,
and eff o r t .
O b j e c t i v e s
There are three major objectives in searching for the best
grinding method:
• The right finish must be considered. You want to turn out a
quality piece with the right size, shape, and surface finish.
• Time efficiency must be considered. You must be able to
produce the job within an economically acceptable period
of time.
• E fficiency of the abrasive tool must be considered. Yo u
want to use the right abrasive at the right time in the right
way so as to get maximum performance from the belt
o r d i s c .
Changing any of these variables will affect the surface
finish. It will also affect the rate of cut and the life of the
abrasive belt. If, however, these variables can be isolated,
they will cause effects in a scientifically predictable way.
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