Problem- VMC 3020 issues

[fixtureguy]

Hello everyone, this is my first post and visit to this site. Looks like a great resource with lots of valuable data.

I have a Bridgeport VMC 3020, with a Fanuc 21i controller. The machine is a 2002 vintage. We are experiencing a strange problem. As a job is cutting the table will suddenly skip... the z axis will rise and all motion except for the spindle will stop. The table will also skip with the machine sitting idle with no program loaded.
This has been going on for a while now. We have to shut the machine down and restart it. Sometimes this works and other times we have to leave the machine sit overnight and when we start the machine in the morning we may get a few hours out of it before this happens again.
We had a pair of techs in to look at it in June and after 2 days of messing around the machine stopped skipping, but they really did nothing concrete that solved the problem.
Anyone have any ideas or a similar experience?

Thanks

Don

[machintek]

I have seen this as well. In the rear cabinet (electrical) top left are 2 small Fanuc modules.
They convert the encoder signals to optical for the control.
You may need to replace one or both. I believe my customer had a Z axis issue but that slaves from the master unit. I replaced both for piece of mind.

George

[fixtureguy]

Thank you, I will take a look at those tomorrow, are those parts something that can be ordered direct from GE Fanuc or is there a better (ie. cheaper) source?

[stephanmoll]

Hello I have the same problem with my bridgeport vmc 3020 And cannot find anywhere the two fanuc modules, does anyone know where I can find them

[machintek]

We ordered them from Fanuc.

George

[stephanmoll]

Hello George I have already tried with fanuc usa and they told me they no longer make does that interface, so dont know what to do???

[machintek]

I will check with my parts guy. He bird dogs what I need. I just give him the part numbers.
GE-FANUC merged with Fanuc USA and is now FANUC CNC.

George

[stephanmoll]

Thank you George the part numbers of the two cards are:
ASVU1
A02B-0259-C180
ASVU2
A02B-0259-C181
Cause I spoke with fanuc USA and they dont have costumer service in my area.
thanxs

[machintek]

I forwarded the parts numbers to my parts guy. He informed me that the last time he ordered a set of these, one came from GE Fanuc at $2500.00 and the other from Fanuc USA for $500.00. It seems neither one had both. I will inform you of what he digs up.

George

[stephanmoll]

thank you very much would be waiting for your answer

[steve eades]

hey everybody it seem like ya are having alot of different problems with the bridgport 3020 i was looking at a used 2000 model and i was just wandering would ya buy another 1 or a different brand ??? thanks for your input

[jimmy111]

Originally Posted by steve eades hey everybody it seem like ya are having alot of different problems with the bridgport 3020 i was looking at a used 2000 model and i was just wandering would ya buy another 1 or a different brand ??? thanks for your input

I have a 2216 that ive had since new. Runs every day for 12 hours. Never a hickup untill it got wet. But just cleaned it out and back to work.
The only irratating thing with them is the memory cards and slot.