Please Note While Programming - HEIDENHAIN TNC 640 User Manual

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Please note while programming:

Program a positioning block to a safe position with
radius compensation R0 before the cycle call.
The approach path (Q465) must be long enough for the
feed axes to be accelerated to the required velocity.
The overrun path (Q466) must be long enough to
decelerate the feed axes.
When the TNC runs a thread cut, the feed-rate override
knob is disabled. The spindle speed override knob is
active only within a limited range, which is defined by
the machine tool builder (refer to your machine manual).
Danger of collision!
With pre-positioning in the negative diameter range, the action of
parameter Q471 Thread position is reversed. In that case outside
thread is 1 and inside thread is 0. Collision may occur between
the tool and workpiece.
With some machine types the turning tool is not clamped in
the milling spindle but in a separate holder adjacent to the
spindle. The turning tool cannot be rotated through 180° in
such cases to machine inside and outside threads with only
one tool for example. If with such a machine you wish to
use an external tool for inside machining, you can execute
machining in the negative diameter range (-X) and reverse the
direction of workpiece rotation.
Danger of collision!
The retraction motion is directly to the starting position.
Always position the tool so that the TNC can approach the
starting point at the end of the cycle without collisions.
Danger of collision!
Programming a Q467 angle of infeed wider than the side angle
of the thread may destroy the thread flank. If the angle of infeed
is modified, the position of the thread is shifted in an axial
direction. With a changed angle of infeed the tool can no longer
interface the thread grooves.
Program the Q467 angle of infeed to be less than the side
angle of the thread
468
Cycles: Turning | THREAD EXTENDED (Cycle 832, DIN/ISO: G832)
NOTICE
NOTICE
NOTICE
HEIDENHAIN | User's manual for cycle programming | 10/2017