M-fin Issues

Hi ,

I use this forum a lot to solve problems , this is the first time I`ve had to ask a question I`m hoping someone can help.

Basically my issue is , we have a Haas CNC machine at the company I work for , we use the machine for drill and tap purposes and it is connected to a end stop system were-by a bar rolls into the machine centre and hits the end stop sensor which stops the rollers and clamps the bar in position , the operator then checks the position of the bar and closes the doors. And this is were the issue arises , Closing the doors with the bar at the end stop triggers a PLC to send a pulse signal via the M-Fin which in-turn starts the machine cycle. However very recently the PLC has been sending the signal and the program has failed to start, this is a intermittent fault as sometimes the machine will start the program and sometimes it doesn't. When the signal has been sent and the program has failed to start the operator will manually press cycle start , even this however sometimes takes 3-4 presses to get it going?

Hoping someone can shed some light on this , would be much appreciated.

Thank a lot

Walt

You would have to post the code for the program. You should not be using the closing of the doors to trigger the program. It is illogical and dangerous. If you actually do this as you say, then you have a switch or other problem not software involved.

Mike

Hi thanks for replying , the doors don't actually trigger the PLC after all , there are 2 things that trigger the PLC , the end stop and the clamp pressure, if these two things are in place and the doors are closed the program should start.

Here is the program code.

T2 G00 G40 G80 G98 G17 G21;
;
M31;
N1 G90 G00 M09;
G53 Z0 M05;
M01;
;
T1 M06 (21mm Drill);
M88;
G90 G00 G54 Y-147.5 S2200 M03;
G43 Z100 H01;
G81 G99 R65 Z30 F200;
;
N2 G90 G00 M09;
G53 Z0 M05;
M01;
;
T2 M06 (16.5mm drill);
M88;
G90 G00 G54 Y-147.5 S1800 M03;
G43 Z100 H02;
G81 G99 R65 Z-5 F350;
;
N3 G90 G00 M89;
G53 Z0 M05;
M01;
M08;
T3 M06 (3/4 UNC TAP);
G90 G00 G54 Y-147.5 S350 M03;
G43 Z100 H03;
G84 G99 R65 Z-18 F889;
;
M33;
G90 G00 G53 Z0;
M21;
M30;
;

Walt

All sorted now , turned out to be a loose plug connection on a circuit board.

Quote:

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Originally Posted by Walterj27

All sorted now , turned out to be a loose plug connection on a circuit board.

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Thanks for the follow up. Glad you got it figured out and it was an easy fix!