ToolMaster TM-U3, Instruction Manual

Page: 13 / 36

Circular Grinding of Cutters
Grinding the Back Angle of Side Cutting Edges
After centering the lip it will be necessary to grind the back rake angles to the sides of the cutting
edge and the end cutting edge. The back rake angles of both cutting edges should be selected to
suit the material to be cut.
Setup Operations
1. Rotate swivel arm to set index F at zero; tighten clamping lever T3.
2. E
ngage index pin P Into
the
long slot.
3. Align cutter by means of gauge C; grip cutter in po§itibn return gauge’C (see Fig.4).
4.
Release clamping lever T2; set swivel arm at desired back rake angle using setting scale
S2; tighten clamping lever T2 (see Fig, 3).
5. Tighten clamping lever T4; release clamping lever T7; shift work fixture on tubular guide
to bring cutter into light contact with grinding wheel, tighten clamping lever T7; release
clamping lever T4.
Circular Grinding
6, Draw index pin P out of the slot; grind desired diameter by rotating spring collet bearing
through 360° . During this operation slowly rotate adjustable stop screw G, while
continuously rotating the spring collet bearing, to advance the work fixture past the
grinding wheel; this will produce uniform stock removal. Fine adjustment during circu
lar grinding is by screw H. Stop screw G is used to establish the length’of the cylindrical
portion which should always be slightly longer than the cutting lip.
7.
E
ngage Index pin P into short slot to enable the collet bear
ing to be rotated 160°
between the index plate stops.
Grinding the Back Rake Angle
8. When grinding the back rake angle, use the fine adjustment screw H over the entire range
of rotation of the collet bearing (see Fig. 3a). Grinding of the back rack angle is posative
controlled. The angle is required over the entire length of the cutting lip.
The vertical swivel bearing, which permits the work holding fixture to be swung back,
enables relief angles up to 40° to be produced, Relief angles over 40° can be obtained by
additionally rotating the collet bearing In the index head. (Only for cylindrical or tapered
cutter with straight end cutting edges or for pointed cutters.)
Upon completion of grinding operations a very narrow land must remain at the cutting edge
(see Fig. 4).