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Turnmilling Calculator

Turnmilling, a process whereby a milling cutter
machines a rotating workpiece, combines milling
and turning techniques and has many advantages.
Multitasking machine tools make this beneficial
method more and more popular and offer inviting
prospect for the manufacturer. Machining of
non-continuous surfaces or eccentric areas of
rotary bodies, machining rotating heavy-weight
parts or materials that generate long chips – here
turnmilling can significantly improve performance
and solve various production problems.

The practical question is: how to calculate the
cutting data during turnmilling? ISCAR proposes
a way of correctly defining the data.

To summarize:

• Cutter positioning relative to the workpiece body
should be done with precaution. If appropriate
inserts are used, and the cutter body is far from
the workpiece, no eccentricity is required; and
the cutter can be positioned with E =0.
w

When uncertainty appears, it is recommended
to be on the safe side and use

• If the feed is given at the workpiece axis
direction (f ), then the workpiece rotational
z
velocity can be calculated by:

• If the feed is given at the spiral direction (f' ),
z
then the workpiece rotational velocity can be
calculated by:

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