macro system variable for Z axis load?

[fordav11]

is there a way to monitor the load of an axis in a macro? (the manual didn't help)

I want to do something like this (Z- drilling example)....

while Z axis load < 50% feed to Z value
if load > 50% stop and retract +1.0mm, wait 2 seconds then continue feeding.

[angelw]

Originally Posted by fordav11 is there a way to monitor the load of an axis in a macro? (the manual didn't help) I want to do something like this (Z- drilling example).... while Z axis load < 50% feed to Z value if load > 50% stop and retract +1.0mm, wait 2 seconds then continue feeding.

I'm not aware of a general system variable available in the Fanuc package that will allow you to achieve what you want, but some MTBs supply an enhanced Macro executable that has load monitoring, Nakamura being one. If I can find the detail I'll post it. You never now, it may be a variable that is available. but just not listed by Fanuc.

Fanuc has iLimitS CNC Software Option for Machine Process, monitoring load, speed and coolant monitoring with Macro


Regards,

Bill

[sinha_nsit]

According to Operator's Manual of 0iMB, G83 can be used in conjunction with overload torque detection signal. This mode is selected my an M-code specified in parameter 5163.
I have never used this feature, but this is what I could make out (my interpretation can be incorrect also!):
It manipulates F and S by sensing the cutting torque. If there is no overload (i.e., no skip signal), drilling is done up to the defined peck depth Q, and thereafter F is increased and S is decreased by predefined percentages (through paramaters) automatically, for the next peck. If overload is detected, the tool is retracted even before reaching Q depth, and thereafter F is decreased and S is increased. F and S can be increased to their maximum possible values on a particular machine. It is also possible to define their minimum values below which these are not decreased.
The number of retractions made during cutting and that made in response to the overload signal can be output to chosen common variables.

Read the manual for more details, and find out whether this feature serves your requirements.

[fordav11]

Thanks for your time checking this. I wanted to use load sensing in other ways too.

All I really need is a system variable for 'Current Z Axis Load'

Obviously this is not available but I'm sure there is provision for a load signal somewhere in the control since newer Mori Seiki multi-axis machines have tool breakage/load monitoring as a standard feature. The problem is this kind of monitoring stops the machine with an alarm when a problem occurs and I want to avoid stops/alarms.

[stevo1]

I am curious on this one as well. I do not know of any macros or variables that can track the load of an axis while drilling by using any kind of conditional statments because these conditions have to be written into the code before and after the hole is being drilled....not during.

Sinha's explanation is the only thing that I have seen where you can set parameters to alarm the machine if a load exceeds a specified amount.

It sounds to me that you really want to just have something track the high/low of the load on an axis while running. I can view things like this on a few controls under the servo monitoring screen but this is not on every machine and I have not idea if there is a way to store that data somewhere.

Stevo