How to Properly Dress Crankshaft Grinding Wheels - Engine Builder Magazine
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How to Properly Dress Crankshaft Grinding Wheels

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The grinding wheel must be dressed
each time it is placed on the machine, even though it may not have been
removed from the wheel center.

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Mount
the wheel dresser on the grinder table. Bring the rotating grinding
wheel up close to the diamond and start the coolant flow. Never dress
without coolant. Frictional heat buildup can cause the diamond to come
loose or separate from its mount. Lack of lubricating properties, along
with cooling, needlessly abrades the diamond.

Face Dressing

Best
results will be obtained if the diamond is brought into contact with
the center of the wheel, fed in a maximum of .002", then traversed each
direction (left and right) off the edge of the wheel. Learning the best
traverse rate for dressing the wheel is a matter of trial and error for
each operator. You have to be fast enough to prevent glazing, but slow
enough to minimize spiral lead marks. Dressing from the center of the
wheel out to each edge helps minimize the effect of the spiral lead
marks on the finish of the workpiece. Do not remove over .002" per
pass. Excessive in-feed will cause the wheel to act like it’s loaded.
This results from wheel material being "pasted" into new exposed wheel
porosity.

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The
type of dress applied to the grinding wheel may be changed to suit
different grinding needs. A rapid traverse will remove large amounts of
material quickly. A slower traverse will produce a more desirable
finish, but won’t remove material as rapidly.

Side Dressing

Whenever
the sides of a grinding wheel are found to run out, they should be
dressed. With the dresser mounted to a table, bring the diamond into
contact with the grinding wheel near its front corner, feed in a
maximum of .002". The wheel is then fed in and out until the necessary
amount has been dressed from each side of the wheel.

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Radius Dressing

When
regrinding a crankshaft, every effort should be made to duplicate the
original corner radii to prevent the crankshaft from being weakened.
Position the diamond in the holder facing out the front. Slide the
holder back, position and lock the radius adjuster at the desired
dimension. Then slide the diamond holder forward until the diamond
contacts the radius adjustment stop. Tighten the diamond holder, unlock
and retract the adjustment stop. Feed the wheel into position fully
forward. Using fine feed, bring the diamond into contact with the front
face of the wheel and dress the full width. Then back the wheel away
from the diamond .004", loosen the swivel lock and remove one of the
stop pins so the upper swivel can be rotated 90° of travel. While
pivoting the diamond through its 90° arc, bring the wheel into contact
and dress of the required amount from one corner. Repeat this process
for the opposite corner by replacing the first stop pin and removing
the second pin to provide 90° rotation in the opposite direction.

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Be sure to keep your diamond dresser tools sharp. Rotate the diamond 30 to 45° after each dressing operation.

face dressing

side dressingRadius dressing

 

– Tech Tip courtesy of Goodson Tools

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