Changing Tool Radius Settings in a CNC Controller

Question
I'm running a Heian ER-242PBMC with a Fanuc 180i-MB control. What I'd like to do is access the tool offset data for use in parametric programming. For instance, where I'd like to run a part in two passes, I would create a compensation value for the first pass that is (Tool radius + 2mm). The dealer doesn't seem to catch on what I'm trying to do. Does anyone know whether these values can be transferred to a variable?

Forum Responses
(CNC Forum)
From contributor K:
I have worked on Fanuc's but not sure how to do what you want on them. It's a piece of cake on Allen Bradley controls. You don't want to access the offset but alter it in the program. For tool diameter it's called machine stock allowance "MSA=2mm" that is the variable.

So my program would go like this;

NCcode
NCcode
NCcode
part of program i want to repeat below
MSA=2; this is tool radius+2mm
(EPP,A,B);this means repeat from "A"to"B"
"A"
NCcode
NCcode
NCcode
MSA=0; this sets tool radius to original
"B"
End of program I want to repeat.

Example:

#100=#2001 (read offset 1 value into command variable)
#101=#100+2. (do your operation)
G01X#101 F250.

I have a twin table machine. Each table has a "consent" button to indicate whether that part is ready to run. M261 & M262 will read the state of those two buttons and run or wait accordingly.

What I'd like to do is run a logic program like this:

N50 IF (table 1 not ready) GOTO 100
table 1 program
N100 IF (table 2 not ready) GOTO 50
table 2 program

I just don't know how to tell it to read the state of those consent buttons!

Then we will do as follow:

N10
N50 IF #1000=0 GOTO 100
M98 PYYYY (table 1 program)
GOTO 200
N100 IF #1001 =0 GOTO 200
M98 PVVVV (table 2 program)
N200 GOTO 10 (LOOPING)
A M code finction will not allow you do the Loop.

To be able to do loop, you need to change machine PLC logic to tight the switch to the interface input signal then it will work. also don't forget that you need to reset the signal during that table is cutting before job is finish, a M95 spindle off command or a vacuum off can rest this input signal.

Is this machine Using FANUC PLC or OMRON PLC? Go to the back cabinet open the door (turn off the power of machine first) and look into your left hand side see there are a OMRON PLC unit or not. Basically you need have Dealer or someone able to modify the PLC to change the PLC to get it work the way you want.

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?

Have you reviewed the related Knowledge Base areas below?

KnowledgeBase: Knowledge Base

KnowledgeBase: Computerization

KnowledgeBase: Computerization: CNC Machinery and Techniques



Would you like to add information to this article? ... Click Here

If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to review our Forum Guidelines.

Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

Return to beginning of article.

Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page. Contact us to discuss advertising or to report problems with this site. To report a problem, send an e-mail to our Webmaster Copyright © 1996-2012 - WOODWEB ® Inc. All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor. Review WOODWEB's Copyright Policy. The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk. WOODWEB, Inc. 335 Bedell Road Montrose, PA 18801 Contact WOODWEB