OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
Version 1.0.1 dated 2015-05-27
Page 59
Original operating instructions
TU3008 | TU3008V
GB
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 whenturning
threads with larger pitches).
The cutting point is set just in front of the starting point of the start of the thread by actuating
thehandwheel of the bedslide.
The cutting point is set just in front of the starting point of the start of the thread by actuating
thehandwheel of the bedslide. With this connection, the adjusted thread pitch is transferred to
the bedslide 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.
Turn the change-over, switch to the right
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 clamping chuck !
Immediately turn off the machine at the run out of the thread and cam the cutter out by turn-
ing the handwheel of the cross slide.
Turn the change-over, switch to the left.
Turn the machine on and return the bedslide to the starting point and switch the machine
off.
Radial infeed over the handwheel of the cross slide.
Turn the change-over, switch to the right
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 spindle and the bedslide is interrupted.
Now the toothed wheels for the longitudinal feed are to be mounted again!
Abb.4-43: Alternate infeed
For larger pitches the alternate 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 with-
out lateral offset. When the depth of
thread is achieved, two passes are per-
formed without infeed.
To machine internal threads, about 2
passes shall be selected additionally for
the infeed (drill rods are more instable).
