Coolant shuts off - LEADWELL MCV-550S

[ddelauter]

I am almost certain this is not a Mastercam or post processor problem, but I am hoping someone has experienced this problem, or similar, and has found a solution.

One of the CNC's I am running now is a LEADWELL MCV-550S. During a tapping evolution, on the first hole, the coolant comes on until it reverses out, then it stays off. The NC code is correct, M8 at the beginning, and then M9 at the end of the operation. It even stays off if I put in an M8/M9 code for each hole.

The only solution, so far, is to have an operation for each hole, but I would rather turn coolant switch to manual on.

Any answers?

[Charles Davis]

definitely not a software problem. interesting that coolant on each hole doesn't solve the problem.

contact the machine manufacturer. perhaps they have a software update that will fix the problem. i'm sure everyone else with this machine is having the same problem; it's software, not hardware related.

[Allan]

What does the G84 Line look like?

You state that you use and M8/M9 for each hole.

 

You know that if there is more than one M code per line the control will act stangely as you describe with no alarm.

Show us the code.

 

[ddelauter]

The code from the post spits out an M8 at the beginning of the operation, and an M9 at the end. That is normal. We have tried to put an M8 and M9 for each hole in one single operation, but that also produced the same result. The only way for the coolant to stay on for all holes (currently) is to have a single hole per operation, or one operation for each hole, whichever way you want to look at it. I would rather just turn the manual coolant switch on.

I believe the problem is a PLC switch. I think when the spindle speed is 0, it will stay off until it is reset. I want to change the parameters for that switch not to read spindle speed. The only time I want the coolant off is when it reads an M9. Now I jsut have to figure out how to program the switch, or maybe, if I am lucky, it will be physical and I can flip it!

Thanks again,

Don DeLauter,

CMED Machine Shop

[nickz]

Before you adjust those settings with the PLC, you may want to check the CNC's "G84" macro code. There may be a M09 in the macro?

[This message has been edited by nickz (edited 04-03-2001).]

[Allan]

Good code:

N30 G00 G90 G54 X-3.3885 Y1.3082 S534 M03

N35 G43 H1 Z1. M08

N40 G98 G84 Z-1. R.1 F41.08

N45 X-2.8095 Y.8471

N50 X1.5763 Y-.5147

N55 X-.5147 Y2.713

N60 G80 M09

Bad Code:

N30 G00 G90 G54 X-3.3885 Y1.3082 S534 M03

N35 G43 H1 Z1.

N40 M08 G98 G84 Z-1. R.1 F41.08 M09

N45 M08 X-2.8095 Y.8471 M09

N50 M08 X1.5763 Y-.5147 M09

N55 M08 X-.5147 Y2.713 M09

N60 G80

If the good code wont work try:

N30 G00 G90 G54 X-3.3885 Y1.3082 S534 M03

N35 G43 H1 Z1. M08

N40 G98 G84 Z-1. R.1 F41.08

N42 M08

N45 X-2.8095 Y.8471

N47 M08

N50 X1.5763 Y-.5147

N52 M08

N55 X-.5147 Y2.713

N60 G80 M09

This method is an easy fix.

Show us the code!