Turning With Auto Feed - Promac GHB-1330 Manuel Utilisateur

If high speed steel (HSS) tools are used about 5 times lower
speeds must be chosen.
Generally speaking, the larger in relation the cutting diameter,
the smaller the possible RPM.
For example:
Turning mild steel at a diameter of 25mm allows a speed of
1600 RPM max.
320 RPM max.
To change the spindle speed:
The speed may never be changed when the spindle or motor
are still running.
Move the speed select levers (E, F, Fig 14) according to the
speed you desire.
F
G
M
O P N
It may be necessary to turn the chuck by hand to help the
gears to engage.

6.5 Turning with auto feed

Move the lever (N, Fig 14) to «
screw rotation.
Move the knob (D) to «
Several automatic longitudinal and cross feeds (see Fig 15)
are readily available by selection on the gearbox handles
( M, O, P, Fig 14).
The feed direction can be chosen with the feed reversing
lever (G, Fig 14).
with carbide tool
with HSS tool
E
A
B
C
D
Fig 14
P
» to stop unnecessary lead
» to engage the feed rod.
Further feed rates are possible by different change gear
setups.
Move the lever (D, Fig 16):
- right and up for longitudinal feed.
- left and down for cross feed.
The correct feed depends on the material to be cut, the
cutting operation, the type of tool, the rigidity of the work
piece chucking, the depth of cut and the desired surface
quality .
10
Fig 15
Fig 1 6