Drilling Operation; Setup And Adjustments; Change Gear Setup; Turning Between Centres - Promac GH-1440K-T Betriebsanleitung

- 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.
B) To cut metric threads with
threading dial:
On most metric threads the threading
dial 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
the corresponding graduation match
on the threading dial.

6.7 Drilling operation

Use a drill chuck with MT 3 arbour
(option) to hold centring drills and
twisted drills in the tailstock.
For recommended speeds refer to
section 6.4
To eject the drill chuck, fully retract the
tailstock quill.

7. Setup and adjustments

Warning:
Setup and adjustment work may
only be carried out after the
machine is protected against
accidental starting.
Turn off the main switch and press
the emergency stop button!

7.1 Change gear setup

Note:
The installed 25T x 127T x 50T gears
will cover most feeds and metric
threads.
The additional gears found in the
toolbox are used for inch threads and
some feeds.
Turn off main switch and press
emergency stop button.
Loosen the locking screw on the pulley
cover, then open the cover.
-Loosen nuts (A, B, Fig 17) to
disengage the quadrant (C).
Fig 17
-Change gears (D and E) to match the
feed and thread chart.
Adjust gears to mesh with upper and
lower gear.
Placing ordinary paper in between
gears helps to adjust for correct gear
spacing (... remove the paper
afterwards!).
Close and lock the pulley cover.

7.2 Turning between centres

Mount the workpiece fitted with the
drive dog between centres.
The driver is driven by the face plate
(Fig 18).
Fig 18
Lubricate the tailstock centre with
grease to prevent tip from overheating.

7.3 Taper turning with tailstock

Turning up to a side angle of 5° can be
achieved by off-setting the tailstock.
8
Fig 19
To offset the tailstock, loosen the
locking handle (A, Fig 19), loosen the
front adjusting screw (B) and take up
the same amount on the rear adjusting
screw.
Tighten the adjusting screws and the
locking nut to hold the tailstock in
position.
The workpiece must be held between
centres and driven by the face plate
and drive dog.
After taper turning, the tailstock must
be returned to its original position.
Turn a test piece and adjust until the
machine turns a perfect cylinder.

7.4 Taper turning with top slide

By angling the top slide, tapers may be
turned.

7.5 Three jaw universal chuck

With this universal chuck, cylindrical,
triangular and hexagonal stock may be
clamped (Fig 20).
Fig 20
To hold big diameter stock, reverse the
top jaws.