LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
2 Backlash may be adjusted by turning the drive spindle assembly
(which consists of all parts contained by the bearing seat insert).
bearing seat insert is locked in position by a dog-point set screw. Loosen
this set screw.
The bearing seat insert has right hand threads and the
backlash is reduced by turning it to the right. Care should be taken not to
loosen the drive gear bearing retainer as this will disrupt the preload on
When the gears are properly adjusted, the
action of the gears meshing together will be so smooth that no gear
contacting will be felt when turning either spindle by hand.
k. Safety Precautions. Although accidents resulting from milling machine
operations are few in number, they are usually severe.
(1) The greatest hazard of milling machine operations is contact with the
revolving milling cutter.
Loose or torn clothing should not be worn when
operating the milling machine. Chips should be removed from the workpiece
with a brush.
(2) Flying chips are dangerous.
Wear goggles or a face shield to prevent
eye or face injuries.
(3) Do not attempt to tighten arbor nuts using machine power.
(4) Never adjust the workpiece or work-mounting devices when the machine
(5) When using a cutting oil, prevent splashing by use of appropriate
splash pans. Cutting oil on the floor can cause a slippery condition that
could result in injury to the operator or other machinists.
This task discussed the operation and set up of the toolpost grinder, metal
cutting lathe fixture, and the milling, grinding, drilling, and slotting
attachments to include lubrication and adjustments. In task three, thread
forms and uses will be discussed.