Optimum OPTI turn TU 3008G Operating Manual page 52

Abb.4-41: Alternately infeed
The cutting point is slit slightly by turning the handwheel of the cross slide the scale is turned to
zero. This is the point of departure for the infeed of the depth of thread.
The scale of the top slide is also set to zero (this is important for the lateral offset when turning
threads with larger pitches).
The cutting point is set just in front of the starting point of the start of the thread by actuating the
handwheel of the lathe saddle.
In standstill of the lathe a connection to the lead-screw is made by shifting the operating lever of
the lead-screw nut. With this connection, the adjusted thread pitch is transferred to the lathe
saddle and to the tool holder.
ATTENTION!
This connection must not be disconnected until the thread is finished !
Starting the threading:
Radial infeed over the handwheel of the cross slide.

Switch the direction of rotation to counter clockwise rotation.

Start the machine and have the first cutting process run.

ATTENTION!
Always have the thumb ready on the OFF-switch in order to prevent a collision with the
workpiece or with the lathe chuck !
Immediately switch off the machine at the run out of the thread and cam the cutter out by

turning the handwheel of the cross slide.
Switch the direction of rotation to clockwise rotation.

Switch the machine on; move the lathe saddle to the starting point; switch the machine off.

Radial infeed over the handwheel of the cross slide.

Switch the direction of rotation to counter clockwise rotation.

Switch the machine on and have the second cutting process run.

Repeat this procedure as often as necessary until the depth of thread is achieved.

To check the thread you may use a thread gauge or a workpiece with an internal thread

M30 x 1.0
If the thread is having the exact size, the thread cutting process may be terminated. Now

you may again shift the operating lever of the lead-screw nut in standstill. In this way, the
connection between the lead-screw and the lathe saddle is interrupted.
Now the gearwheels for the longitudinal feed are to be mounted again!

GB TU3008G
52
For larger pitches the alternately flank
infeed is selected. The top slide is from the
2nd passage in each case 0.05 - 0.10 mm
adjusted alternately to the left and right.
The last two passes are performed without
lateral offset. When the depth of thread is
achieved, two passes are performed
without infeed.
To machine internal threads, about 2
passes shall be selected additionally for
the infeed (drill rods are more instable).
Translation of original instruction
Operation
Version 1.1.6 - 2021-9-17