LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
selected for the grinding job by dimension and type as given in the
appropriate table. Two or more quills in a model series may meet the same
dimensional requirements of a specific grinding operation or application.
Always choose the quill with the greatest rigidity for greater accuracy,
finer finish, and longer wheel life. For internal grinding, select a three-
bearing quill whenever possible. If job size limits the selection of two-
bearing insert type quills, select the insert spindle with the shortest
practical extension.
For all types of grinding, choose the quill that
offers the largest possible wheel diameter. Larger wheels operate at lower
speeds, run cooler, last longer, and provide greater accuracy and finer
e.
Maintenance.
(1) Lubrication.
The motor requires no lubrication since it is equipped
with grease sealed ball bearings.
(2) Quills.
(a) Some Dumore quills are equipped with ball bearings packed with
grease in assembly. These require no lubrication. They can be operated in
any position. Other quills are made with "fog of oil" lubricating system,
and are identified by the plug marked "OIL." Before these quills are put
into use, and also after being stored for a long period of time, 180 drops
of spindle oil should be added. Oil quills regularly but not to excess, as
too much oil causes the quills to overheat. Do not allow dirt to enter into
the quills when adding oil.
(b) All Dumore quills are equipped with water and dust throwers. When
used for wet grinding, always start the spindle rotating before the coolant
is turned on; and turn the coolant off before stopping the spindle. Never
allow the coolant to flow on the quill when the spindle is not rotating.
(3) Brushes.
(a) Normal brush life varies from 500 to 2000 hours depending upon the
severity and continuity of service.
Brushes should be inspected
periodically and wiped clean before returning them to their
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