Cutting Tool Setup; Recommended Spindle Speeds; Manual Turning; Turning With Auto Feed - Promac PBD-2870 Manuel D'utilisation

10.3 Cutting Tool Setup

The cutting angle is correct when the cutting edge is in line
with the centre axis of the work piece. Use the point of the
tailstock centre as a gauge and shims under the tool to obtain
the correct centre height (Fig 10-5).
Figure 10-5: Cutting tool setup
Use a minimum of two screws to clamp the cutting tool.
Avoid large tool extensions.

10.4 Recommended spindle speeds

ATTENTION:
Generally speaking, the smaller the cut diameter, the greater the
RPM required. Soft materials require higher speeds; hard metals
slower speeds.
Metal is usually machined with coolant or cutting oil applied.
Recommended spindle speeds for cutting 10mm diameter,
with HSS tools (High speed steel tools):
Plastic: ................................................................. 2000 /min
Aluminium:.......................................................... 2000 /min
Brass: ...................................................................1000 /min
Cast iron:............................................................. 1000 /min
Mild steel:.............................................................. 800 /min
High carbon steel:................................................. 600 /min
Stainless steel:....................................................... 300 /min
For carbide tools (HM), 5 times higher speeds can be chosen.
For example:
Turning mild steel at a diameter of 20mm allows
With HSS tool......................................................... 400 /min
With carbide tool................................................. 2000 /min

10.5 Manual turning

Apron travel (Y, Fig 10-6), cross travel (Z) and top slide travel
(BB) can be operated for longitudinal and cross feeding.
Figure 10-6: Machine controls
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.

10.6 Turning with auto feed

Move the half-nut lever (AA, Fig 10-6) down, to engage the
automatic longitudinal feed. Move it up to disengage
Three feed rates are readily available by rotating the feed
select knob (R, Fig 9-1).
Figure 10-7: Available feed rates
For example:
Operation
Stock removal
Finishing cut
Micro finishing cut
NOTE: Three additional feed rates are available with different
change gear setup (Fig 10-7).
15
feed/rev feed select knob
0,28mm.............................. III
0.14mm............................... II
0.07mm................................ I