HEIDENHAIN TNC 640 - Page 705

Turning | Turning program functions (option 50)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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15 L X+165 Y+0 R0 FMAX
Pre-positioning the tool
16 L Z+2 R0 FMAX
Tool at starting position
...
Machining with inclined axis
M128
Alternately, you can use the M128 function The effect is the same,
but the following limitation applies here: if you activate inclined
machining with M128 then tool-tip radius compensation without
a cycle, i.e. in traversing blocks with RL/RR, is not possible. If you
activate inclined machining via M144 or FUNCTION TCPM with
REFPNT TIP-CENTER then this limitation does not apply.
FUNCTION TCPM with REFPNT TIP-CENTER
Use FUNCTION TCPM with the selection REFPNT TIP-CENTER to
activate the virtual tool tip. If you activate inclined machining via
FUNCTION TCPM with REFPNT TIP-CENTER then tool-tip radius
compensation without a cycle, i.e. in traversing blocks with RL/RR,
is possible.
Inclined turning is also possible in the Manual operation operating
mode if you activate FUNCTION TCPM with the selection REFPNT
TIP-CENTER in, for example, the Positioning w/ Manual Data Input
operating mode.
Simultaneous turning
You can combine the turning operation with function M128 or
FUNCTION TCPM and REFPNT TIP-CENTER. This enables you to
manufacture contours in one cut, for which you have to change the
inclination angle (simultaneous machining).
The simultaneous turning contour is a turning contour for which a
rotary axis whose inclination does not violate the contour can be
programmed on polar circles CP and linear blocks L. Collisions with
lateral cutting edges or holders are not prevented. This makes it
possible to finish contours with one tool in a continuous movement
although different parts of the contour are only accessible with
different tool inclinations.
In the NC program you define how the rotary axis has to be
inclined to reach the different contour parts without collisions.
Use the cutter radius oversize DRS to leave an equidistant oversize
on the contour.
Use FUNCTION TCPM and REFPNT TIP-CENTER to measure the
theoretical tool tip of the turning tools being used for this.