LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
FIGURE 33.
POSITION OF THE DIAMOND DRESSER.
(5) When truing a grinding wheel, bring the center of the wheel face in
contact with the diamond by carefully feeding the cross-slide in by hand.
Move the wheel clear of the diamond and make a cut by means of the cross-
slide. The maximum depth of cut is 0.002 inch. Move the wheel slowly back
and forth over the point of the diamond. Move the carriage if the face of
the wheel is parallel to the ways of the lathe. Move the compound rest if
the face of the wheel is at an angle. Make the final depth of cut of 0.0001
inch with a slow even fed to obtain a good wheel finish. Remove the diamond
dresser as soon as the wheel is dressed properly.
Adjust the grinder to
begin the grinding operation.
(6) Rotate the work at a fairly low speed during the grinding operation.
The recommended surface foot speed is 60 to 100 feet per minute (fpm). The
depth of cut depends upon the hardness of the workpiece, the type of
grinding wheel, and the desired finish. Avoid taking grinding cuts deeper
than 0.002 inch until experience is gained. Use a fairly low rate of feed.
Experience will soon allow one to be able to judge whether the feed is to be
increased or decreased.
Never stop the workpiece or the grinding wheel
while they are in contact with each other.
d.
Selecting the Proper Quill.
Accuracy, quality of finish, and metal
removal rate depend upon the selection of the correct quill for a specific
grinding job. Complete dimensions and specifications of all Dumore quills
appear in the TM 9-3460-215-10. The correct quill should be
80
Previous Page
