Please Note While Programming; Cycle Parameters - HEIDENHAIN TNC 640 User Manual

11
Cycles: Special Functions | ASCERTAIN THE LOAD (Cycle 239, DIN/ISO: G239, software option 143)

Please note while programming:

The machine must be prepared by the machine tool
builder for this cycle.
Cycle 239 can only be used with option 143 LAC (Load
Adaptive Control).
Danger of collision!
The cycle can execute extensive movements in several axes at
rapid traverse!
Ask your machine manufacturer about the type and extent of
Cycle 239 before using it
Before cycle start, the TNC might move to a safe position;
this position is defined by the machine tool builder
Set the potentiometer for feed-rate and rapid-traverse
override to at least 50 % to ensure a correct ascertainment of
the load
Cycle 239 becomes effective immediately after
definition.
If you are using the mid-program startup function and
the TNC skips Cycle 239 in the block scan, the TNC
will ignore this cycle—no weighing procedure will be
performed.
Cycle 239 supports the determination of the load
on synchronized axes, provided they have only one
common position measuring device (torque master
slave).

Cycle parameters

Q570 Load (0 = Delete/1 = Ascertain)?: Specify
whether the TNC should perform an LAC (Load
adaptive control) weighing run, or whether
the most recently ascertained load-dependent
feedforward and controller parameters should be
reset:
0: Reset LAC; the values most recently
ascertained by the TNC are reset, and the TNC
uses load-independent feedforward and controller
parameters
1: Perform a weighing run; the TNC moves
the axes and thus ascertains the feedforward
and controller parameters depending on the
current load. The values ascertained are activated
immediately
352
NOTICE
NC blocks
62 CYCL DEF 239 ASCERTAIN THE LOAD
Q570=+0 ;LOAD ASCERTATION
HEIDENHAIN | User's manual for cycle programming | 10/2017