Haas control issue

[steve f]

Hey guys and gals,

 

I provide contract programming for several local manufacturing companies and one of my customers has a HAAS VF-4 that I've been programming toolpaths on recently to cut some taper walled slots .100" wide by 1.26" deep (mould application). The nc program in question ran over all of last weekend cutting away fine until the last slot at which point the machine started creating motion beyond the programmed coordinates...essentially the X axis quit moving on an X,Y command creating a slot that has essentially gouged the part.

 

 

I've checked and re-checked the program with no problems showing, dryran the same program again this morning and no problems. The customer wasn't particularily pleased to say the least but are being gracious in recognizing there was a machine issue over the weekend.

 

This is a big customer and I'd like to find someone else out there who's run into a similar situation to clear the air of any doubt.

 

So here's your chance to give me all the dirt on Haas controls. Honestly, I love 'em for their simplicity but it's no good if you can't trust the machine.

 

cheers,

 

steve

 

mill3 v9

www.muvdesign.com

[Midwest]

We have a HAAS VF-3, never had any problems.

 

 

We also have a Hurco that has made moves that have scrapped parts. A coworker was making several of the same size inserts using a vise. The hurco made all the inserts then scrapped the last one with a bad move. Trashed the Carboly cutter. We ran the program again and it ran just fine.

[Lars Christensen]

Did you dryrun the program on the same machine, with the same work offset?

Haas has there cabels for the axis laying underneed the table, and as time goes on they can go bad from rubbing against the casting. That happend with the Y axis on our machine.

 

Lars.

 

"Code is Code"

[steve f]

Lars,

 

I dryran the program 1/2 hour after stopping it in cut...same machine and work offsets. I'll look into the cable issue, the machine is only 3 years old but it's been running nearly non-stop since it was purchased.

 

Thanks for the tip.

 

 

steve

[Lars Christensen]

quote:

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the machine is only 3 years old

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But But it is a Haas

[Flycut]

I've had something similar happen once.

Chips had pilled up on the covers behind the table and when the table moved all the way back the chips would pack up.

I was running a srtaight cut along the x axis and all of a sudden the lead screw in y axis slipped.

 

You say your machine ran all weekend!?

Do you think this might have been the issue?

[Guest CNC Apps Guy 1]

I've had something similar on a Fadal. Scrapped a part with a program, ran another 10 parts and no issue. That was hard to 'splain to the boss. NEVER had it happen on a Fanuc Contol though.

 

CNC's SHOULD run unattended, hence they are called CNC - Computer Numerical Control, NOT HIC - Human Intervention Control.

 

If it can't run without someone babysitting it, somebody somewhere did not do their job.

[Kevin Goddard]

I second the packed chips between the table and the Z ways. I have seen that happen. Good luck....Kevin

[Guest]

I'll 3rd the packed chips, had it happen on a Matsuura.

[Müřlıń®]

quote:

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X axis quit moving on an X,Y command creating a slot that has essentially gouged the part.

---

If this occurs on a closed loop system, the control should halt on an endpoint error.

 

If chips get crunched up on a slide, the control should fault out with an axis overload.

 

I would get a tech guy out and have him check my main and slide driver boards. But this is prol a random error that he will not be able to see unless he happens to be standing by the machinetool when it does it again.

[Chris Rizzo]

Yeah, haas will certainly alarm out from anything impeding programmed table movement. Chips, drops from parts, vices, handles, etc. etc.

[mkd]

I have heard of radar signals interfering with fiber optic cables that can cause a Fanuc machine to take-off. Controls later than 11m, I think. It can be fixed with shielding.

[Jeff the haas_guy]

Chips are a problem. Vise handles too. I learned that the hard way. Doing damage to the door with the vise handle. Also replacing the wipers on the Z ways when chips pack up and ruin them.

[TheePres]

Do the old Bondo trick, and prove your code is good.