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GRINDING REEL INTO A TRUE CYLINDER BY
SPIN GRINDING (CONTINUED)
10. Set traverse speed knob to approximately 12, then
turn on the traverse switch and begin grinding. If reel
is in bad condition, traverse slower as more material
can be removed. Conversely, if the reel is in good
condition, speed can be increased.
MAXIMUM RECOMMENDED STOCK
REMOVABLE PER PASS IS .004. NOTE: THE
INFEED HANDLE IS CALIBRATED IN INCREMENTS
OF .002 (.05 MM) ON THE RING SCALE LOCATED
ON THE INSIDE OF THE INFEED HANDLE.
11. If grinding wheel is only making contact in one part
of the reel, adjust the traverse stop so the carriage
traverses slightly further than the contacted area. As
you infeed and the wheel makes full contact in this
area, move the traverse stop away 3" [7.6 cm] to 5"
[12.7 cm]. This will speed up the grinding process of
getting a cone shaped reel into a true cylinder.
12. Spin grinding is completed when full contact is made
across the entire length of the reel and the entire
width of all blades and the cutting edge is sharp.
13. To complete grinding the outside diameter to a true
diameter, proceed to spark out the reel. To spark
out the reel, infeed the grinding head approximately
.002" [.05 mm] (one line on the ring scale) and let
the grinding wheel sparkout. During sparkout allow
the grinding head to make at least 20 traverse passes
with no additional infeed. Set traverse at a slow
speed on dial, approximately 4 to 8 feet per minute
will give the best results. After the sparkout grind,
shut the grinder completely off.
NOTE: This process refers to sparkout, but what we
are looking for is a near sparkout, approximately
a 99% reduction in grinding sparks from normal
grind. Do not run sparkout until you have no sparks
because this could be an extremely extended
period.
14. Greatest accuracy and best finish is obtained when
the reel is sparked out. Use your set up gauge, prior
to relief grinding to check the reels for roundness.
This is very important when first learning the
operation of your machine.
OPERATING INSTRUCTIONS
MOVE TRAVERSE STOP IN ON TAPERED
REEL TO SPEED UP GRIND
IT IS VERY IMPORTANT IN SPIN GRINDING THAT
YOU THOROUGHLY SPARKOUT AT THE END OF
THE GRIND CYCLE. THE DIFFERENCE BETWEEN
ACHIEVING .005 OR .003 TOTAL INDICATOR
READING IS ACCOMPLISHED THROUGH PROPER
SPARKOUT.
39
FIG. 70
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