Instruction Manual
Section Five.
For extreme accuracy, it will be necessary to install a test arbor in the work
head or between centers to check for alignment with the table travel. If
enough material is to be removed, the work may be gauged as ground and
the table taper adjusted.
G. If very heavy work is placed on the machine, it may be desirable to tighten
the right-hand tailstock Lock Screw on top of the unit Clean and examine
the work centers for scoring. They must be reground if scored. Apply center
oil to the work centers before placing the work or arbor into position.
H. Start the motorized workhead in the "forward" direction and the wheel ro
tating in the "forward" direction; this will give opposite rotation at the point
of contact. Approach the work slowly until the first contact is made. Set
the Crossfeed dial at 0 and begin to traverse the table with an even motion
to the right and left — far enough so that only about one third of the wheel
travels off the work. Traveling completely off the work produces undersized
work ends; not traveling far enough off the work produces oversized work
ends The wheel may have to be slightly recess dressed on the side back
from the periphery in order to avoid touching critical shoulders when the
work diameter changes. No more than 0005 to .001 inch of Crossfeed should
be taken per traverse of the work. The amount removed per traverse by
cylindrical grinding will be equal to twice the infeed taken on the Crossfeed
of the grinder.
I. If the machine is equipped with coolant, use an adequate flow of this over
the work at all times because it will provide more accuracy and will usually
improve the final finish on the work Excessively dirty coolant will produce
a scratchy, poor finish.
J Wheel and work rotation speed and work traverse speed:
I. The usual R.P.M. for straight wheels yields between 5500 and 6500 sur
face feet per minute This S.F.P.M. is partly governed by the stated maxi
mum wheel R.P.M. While WORK speeds from 40 to 50 S.F.P.M. cover
the majority of situations, the extreme limits are about 30 for hardened
steel and 100 for finishing cuts on soft material. Work traverse rate per
revolution of the work is usually in a ratio of about 2/3 to 3/4 of the
wheel width to one revolution of the work.
2. At each end of the table traverse, the table should "dwell" or stop
momentarily. This action prevents the jar that results if the table is
instantly reversed. It also aids in holding size as the front edge of the
wheel does the heaviest part of grinding and the after-edge cleans up
the cut, reducing it to size. Consult the instructions on hydraulic con
trols, Section Four, Part I I I , Page 11. if the machine has a power-driven
table.
K. Plunge Grinding:
1. In this process, the Crossfeed is usually the only control that is used, and
the work is smaller in length that the wheel face width.
2. If the plunge is into work which is longer in length that the face of the
wheel (OR A PROFILE DRESSED INTO THE FACE OF THE WHEEL),
then the work must remain in the same longitudinal position.
3 When possible in plunge grinding, oscillate the wheel slightly to prevent
lines in the work.
- 7 7 —
