z axis out of bounds parameter haas

[edthecncman]

I am running a Haas router with a fanuc controller. at this time we are only using one tool to perform our cutting operation. Our z- word is allways in the neighborhood of -.025. sometime when an operator changes the program to, for instance, z -.027, he inadvertantly enters z -.27 causing the tool to crash into the workpiece. Is there an z axis out of bounds that can be entered into the parameters so that when the large z- word is entered the machine will generate an z axis overtravel alarm? or any other suggestions can be considered.

[Dan Fritz]

You can use the software overtravel limits for this, but it's an option. Setting the parameters for the limits would not do anything if the option parameter is not turned on.

You didn't mention what model Fanuc control you have, so maybe you would post that for us.

[Geof]

It is not likely that it is actually a Fanuc controller, it will be a Haas controller with Setting 33 Coordinate System set to FANUC. Sometimes called Fanuc mode.

To my knowledge from a lot of experience on Haas machines the only way to limit the travel is to change the maximum travel distance parameter which is not a good idea. Also there is no way to check for incorrect program entries like the one decribed.

There is a work around if only one tool is being used. Turn Setting 8 Program Memory Lock ON. This will prevent anyone changing values in the program but the position of the tool can be changed by changing the Z value in the Work Offset table.

Now put a limit in Setting 142 Offset Change Tolerance. This does not prevent the offset value being changed but the limit can be 0.027 and if the operator tries to enter a larger value the control displays a warning and the change has to be confirmed or rejected by pressing the Y or N key.

This does not stop the operator making the change but it does give some added protection.

[dcoupar]

I would tell your operator that if they crash the machine due to careless editing, they can find another job. Or, you can do like Geof says and lock out the program edits.

[Geof]

Originally Posted by dcoupar I would tell your operator that if they crash the machine due to careless editing, they can find another job....

Don't say that. I would have to sack myself every month or so.

[fuzzyracing1967]

you can go two ways,setting 119 offset lock will do just that,not let the offset be changed,or setting 142 that will give an alarm if offset changes are more than you want.