FIGURE 26. UNDERCUTTING MICA USING AN ALTERNATE HAND METHOD.

FIGURE 25. UNDERCUTTING MICA USING

A POWER-DRIVEN TOOL.

hard stone to ensure a smooth cut during

the turning operations. Position the tool

FIGURE 24. PROPER POSITION OF

with respect to the commutator as shown

CUTTING TOOL.

in figure 24. Resurface the commutator

d . Repair of Armature.

at 800 rpm taking only light cuts each

time. No more than 0.005 inch should

(1) Resurfacing. Sharpen lathe cutting tool

be removed during any one cut and the

to the dimensions given in figure 23.

final cut should not be more than 0.002

After grinding, hone the tool with a fine

inch. After resurfacing, check commu-

FIGURE 26. UNDERCUTTING MICA USING AN ALTERNATE HAND METHOD.