LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
MOUNTING THE GRINDER AT THE CENTER HEIGHT.
the highest recommended speed.
A higher than recommended speed may cause
the wheel to disintegrate. For this reason, wheel guards are furnished with
the toolpost grinder to protect personnel against injury.
(3) Always check the pulley combination given on the instruction plate of
the grinder when a wheel is mounted. Be sure that the combination is not
reversed, as this may cause the wheel to run at a speed far in excess of
that recommended. During all grinding operations, wear goggles to protect
your eyes from flying abrasive material.
(4) The grinding wheel must be dressed and trued.
Use a diamond wheel
dresser to dress and true the wheel. The dresser is held in a holder that
is clamped to the chuck or faceplate of the lathe. The point of the diamond
is to be set at center height and at a 10 to 15 angle in the direction of
the grinding wheel rotation, as shown in figure 33 on the following page.
The 10 to 15 angle prevents the diamond from gouging the wheel. The lathe
spindle is locked by placing the spindle speed control lever in the low rpm
The lathe spindle does not revolve when the grinding
wheel is being dressed.