Examples For Thread Cutting - Optimum OPTI turn TU 3008G Operating Manual

Img.4-38: Pitch angle

4.19.4 Examples for thread cutting

As an example, a metric external thread M30 x 1.0 mm made of brass is being machined.

Steel sheets are to be laid under the complete tool holder or turning tool to achieve exactly
the turning center.

The lowest spindle speed is set so that the lathe will not coast too long !

Mount gear pairing for pitch 1.0 mm in the change gear !
Abb.4-39: Thread cutting
Abb.4-40: radial infeed
Operation
Version 1.1.6 - 2021-9-17
The outer diameter had been turned to 30.0 mm and the
tool holder is clamped in the quadruple holder for
threading aligned angular to the rotation axis. The height
of centres is checked (as described).
The depth of thread is manufactured in
various passes. The infeed is to be
reduced after each pass.
The first pass takes place with a infeed of
0.1 to 0.15 mm.
For the last pass the infeed shall not be
below 0.04 mm.
For pitches up to 1.5 mm the infeed may
be radial.
For our example 5 to 7 passes are being
determined.
Translation of original instruction

Pitch angle
Pitch P
P

---------------- -
tan =


D
2
TU3008G GB
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