Abstract:
SUMMARY
The material is presenting phenomena which though met and
recognised previously the significance to the grinding process was
on these previous occasions not critical. With this material,
instead of a wheel life variation of 0.5% maximum there can be 3096
to 40% reduction in expected wheel life. A detailed explanation
of this element of wheel face life will be included in the fine_
report when repeatable test results to substantiate the parley will
be available. The test on soluble type coolants have not as yet
been as successful as one would have hoped and it is intended to
ask the supplier if an improvement can be made from the knowledge
gained by the test here reported. The workpiece in all cases where
soluble coolants were used remained cool, but with the very limited
number of oil coolants some temperature rise in the workpiece is
experienced.
This temperature rise is not very critical if the workpiece is
of sufficient surface area to allow cooling to take place more
rapidly. The test piece used in the laboratory is 2.5 ins x 6 ins.
long, and is now 0.5 ins. thick (originally 1.0 ins).
The calculation is made and included for wheel specification
Carborundum 5A 46/54 0.8 V.50 using Fletcher Miller Product
M7/63
This is the first result which has given a performance life
long enough to make these calculations and is included to enable any
firm who must use results immediately to make use of our work. While
not wishing to depreciate this product or to appear over enthusiastic
I shall be surprised if improved life is not achieved but this fuller
calculation will allow further appreciation of the numerical methods
we are using.
