Drilling Operation; Setup And Adjustments; Change Gear Setup Turning - Promac GH-1440W Operating Instructions Manual

- 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.
9
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.
Use Molykote Paste G (or adequate
grease) to lubricate the jaws.