Cutting Tool Setup; Recommended Spindle Speeds; Manual Turning; Turning With Auto Feed - Promac PBD-3069 Manual

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 (AA, Fig 10-6), cross travel (BB) and top slide
travel (DD) 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

Select "Feeding" mode on gear box (NN, Fig 9-1).
Select feed forward or reverse direction (S).
Start the auto feed with lever (P, Fig 10-7):
- For longitudinal feed, move lever right and up......
- For cross feed, move lever left and down ..............
Figure 10-7: Auto feed
Three longitudinal and three cross feed rates are readily
available by rotating the feed select knob (R, Fig 9-1).
15