7
6.6 Turning with auto feed
Three automatic longitudinal feeds
are readily available by selection on
the gearbox handle. Further feed
rates are possible by different
change gear setups.
By moving lever (A, Fig 9) upward,
the automatic feed is engaged.
Fig 9
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.
For example:
OD-turning mild steel of 20mm
diameter with an HSS tool at 350
RPM and with rigid chucking.
Change gear setup as shown (Fig
10).
Fig 10
Stock removal and roughing cut:
Depth of cut
1,5mm
Feed per revolution
0,15mm
(change gear box position III)
Finishing cut:
Depth of cut
0,5mm
Feed per revolution
0.07mm
(change gear box position II)
Micro finishing and calibration
cut:
Depth of cut
0,2mm
Feed per revolution
0.04mm
(change gear box position I)
When roughing big diameters
reduce the depth of cut!
6.7 Thread cutting
Threading is performed in multiple
passes with a threading tool.
Each depth of cut should be about
0,2mm and become less for the
finishing passes.
A) To cut inch and metric threads
Set the machine up for the desired
threading pitch and first depth of cut.
Engage the halve nut (A, Fig 11).
The halve nut must be engaged
during the entire threading process.
- Start the machine at the lowest
spindle speed.
- When the tool reaches the end of
cut, stop the motor and at the same
time back the tool out of the part so
that it clears the thread (Attention
inertia: Stop the motor in time)
- Reverse the motor direction to
allow the cutting tool to travel back
to the starting point.
Repeat these steps until you have
obtained the desired results.
Caution:
The spindle direction may not be
changed during machine
operation!
Fig 11
B) To cut metric threads with
pitch 0,4/ 0,5/0,75/0,8/1 /1,5 /2 /3
mm:
On these pitches the threading dial
(B, Fig 11) can be used.
The halve nut can be opened at the
end of cut, rather than the motor
being stopped and reversed.
The halve nut may only be engaged
at any graduation match (every
12mm on the lead screw).
6.8 Drilling operation
Use a drill chuck with MT 2 arbor
(option) to hold centring drills and
twisted drills in the tailstock.
Fig 12
For recommended speeds refer to
section 6.4
To eject the drill chuck, fully retract
the tailstock quill.
7. Setup and adjustments
General note:
Setup and adjustment work may
only be carried out after the
machine is protected against
accidental starting by pulling the
mains plug.
7.1 Change gear setup
Unplug the machine from the power
source.
Loosen the locking screw on the
pulley cover, then open the cover.
-Loosen screw (1, Fig 13)
-Unscrew bolt (2), remove washer
(3) and gear (6)
-Loosen bolt (7) to allow movement.
-Loosen nut (5), remove washer (4)
and gear (8)
Fig 13
Reassemble with desired gear setup
