4th axis issues

[capital]

We have a yang machining center with a fanuc omd control. It has a forth axis(rotary table). We can get the forth axis to turn manually and independantly(in a program) however, we cannot seem to get it to rotate simultaneously with any other axis. Is this a parameter issue or what. Also we occasionally get a 444 error that is not in the manual what is it?

[ChattaMan]

Sounds like you have an indexer not a 4th axis. You have not given enough info to work on.

Part prog sample would help.
In the prog, is it moved independantly by an M code or a A axis command?
Is the 4th axis programmed separately on it's own control panel?
What make/model is the 4th axis.
Does your 444 error appear on your Fanuc control or 4th axis control?

[avtechmachine]

I have to agree with ChattaMan, your 4th Axis popery is a Indexer instead?

[capital]

The 444 error appears on the fanuc control. In the program the forth axis is moved independantly by a B command which I assume is the same as an A command.

[avtechmachine]

Ref. to Fanuc Maintenance manual servo alarm section, you need to check DGN number 720 to 727 to see which bit number is equal 1
make sure to check DGN not parameter

Ahn Vuong
ahnv@avtechmachine.com

[avtechmachine]

also need to check on the servo drive inside of the electrical cabinet to see any alarm number displace

Ahn Vuong
ahnv@avtechmachine.com

[hrh]

If alarm 444 then this is a proper 4th axis integrated in the machine.
Check Diagnostic 723 when the alarm appears as well as alarm indications on the 4th axis servo amp.

The option for simultaneous 4-axes interpolation and or cylindrical interpolation is required for the 4th axis to move together with the other three axes.

Usually a M-code is required to release the brake before moving the 4th axis.
You should then command a M-code again to lock the brake when the cutting force on the steel component is high.
Therefore check if the 4th axis unit has sufficient air for releasing the brake and that the pneumatic valve is operating as well when commanding clamp or unclamp.

[avtechmachine]

"Usually a M-code is required to release the brake before moving the 4th axis.
You should then command a M-code again to lock the brake when the cutting force on the steel component is high.
Therefore check if the 4th axis unit has sufficient air for releasing the brake and that the pneumatic valve is operating as well when commanding clamp or unclamp. "

Just in case if you need to know the M code for clamp & unclamp for this VMC, they are M10 and M11

Ahn Vuong

[capital]

How do I find out if I have the option for 4-axes interpolation installed?

[hrh]

Parameter 914 bit 7 = 4th axis interface
(Control should then have parameters from 8400 to 8499)

Parameter 907 bit 2 = Simultaneous 3 axes control
Parameter 913 bit 4 = Simultaneous 4 axes control
Parameter 917 bit 0 = Cylindrical interpolation

bit# 7654321
bit# 0000000

BACK UP THE CONTROL's DATA BEFORE ATTEMPTING ANY ADJUSTMENTS.

[capital]

DGN 723.5 on when alarm 444 what does that tell me

[mopar499]

shouldn't the bits be?

76543210