Y-Axis Jump and Z-Axis Lag Error

[#2#]

This has happened a few times in the past (maybe 4 times in the last year). Now, it has happened twice in the last two days. While moving manually with the jog box, the machine will 'jump' in the +y direction. It will only move an inch or so and then be back to normal. Needless to say, it scares the poo out of the operator. After it does this, it kicks up an error that reads "Z-axis excess lag error"

According to previous posts, that lag error is because of movement that is unexpected. I find it odd that it is a z-axis error instead of a y-axis error. I suppose it could be moving in both y and z but more easily noticed in y. I believe the lag error is a result of the jump so I think if I fix the jump, the error will not occur.

Anyone know what could be causing this jump? Do you think it could be the joystick going bad?

[Matthew D. Hoedeman]

This has happened a few times in the past (maybe 4 times in the last year). Now, it has happened twice in the last two days. While moving manually with the jog box, the machine will 'jump' in the +y direction. It will only move an inch or so and then be back to normal. Needless to say, it scares the poo out of the operator. After it does this, it kicks up an error that reads "Z-axis excess lag error"

According to previous posts, that lag error is because of movement that is unexpected. I find it odd that it is a z-axis error instead of a y-axis error. I suppose it could be moving in both y and z but more easily noticed in y. I believe the lag error is a result of the jump so I think if I fix the jump, the error will not occur.

Anyone know what could be causing this jump? Do you think it could be the joystick going bad?

It's just a "jump, to the left"?
Does it then do a "step, to the right"?
It really drives me insa-a-a-a-ane when it does that.

I would think that there are a few possibles here:

1) pot-meter of joystick going back, has a 'dead-spot' in it
2) short somewhere or loose connection to the joystick
3) HUGE build-up of gunk where it is 'sticking', then getting loose and charging
4) mis-adjusted tension on drive system

Just a few things I can think of, I am sure that there are many, many more.

[Wes Cisco]

Put your hands on your hips . . .
Bring your knees in tight . . .

5) Dirty or pitted ways
6) Clogged air bearing orifice(s)!!! (hehehehe he said orifice! hehehehe!)
7) Terrorist have slipped LSD into the coffee supply
8) Y-axis motor needs "tunning" or is going bad
9) Your SMA is expired.

HTH

[Andrew Gardner]

And do the pelvic thrust...


Also, make sure the scales are clean - I've had problems with mine doing similar things.

[Jan d.]

You may also have a short. Somewhere in your jogbox, I mean. Or a ground that is starting to get minimal causing loops inside your encoder wire shielding. No fun to debug, since it seems to be intermittent.

[Cumofo]

It's just a "jump, to the left"?
Does it then do a "step, to the right"?
It really drives me insa-a-a-a-ane when it does that.

I think if you:
1) Put your hands on your hips.
2) You bring your knees in tight


Are you using a PFx machine?

I tink yer scale is going out and the machine is trying to reconcile the current location with the expected location. Heat will do that. Is your room nice and cool? Be thankful the Z isn't doing that!

[tdracer]

I also use a B&S 7-10-7 that had a similar problem. It would jump in the Y+ direction ONLY in manual mode. I replaced the Joystick several months ago and haven't had any problems since.

[Gregl]

Put your hands on your hips . . .
Bring your knees in tight . . .

5) Dirty or pitted ways
6) Clogged air bearing orifice(s)!!! (hehehehe he said orifice! hehehehe!)
7) Terrorist have slipped LSD into the coffee supply
8) Y-axis motor needs "tunning" or is going bad
9) Your SMA is expired.

HTH

Everything moved real nice last time #7 happened

[John Riggins]

Had this happening on one of our old Dea machines.
It was happening in the Z axis.
It eventually "ran away" and crashed into the granite at something near warp speed (Ludicrous speed?).
Pieces of stuff went flying all over the room.
Turned out the scale was TU.
The old PH9 survived but the TP2 and everything else connected to it was toast.
Clean the scale and try to determine if it always happening at the same place.

[Gregl]

[QUOTE=John Riggins;55627]Had this happening on one of our old Dea machines.
It was happening in the Z axis.
It eventually "ran away" and crashed into the granite at something near warp speed (Ludicrous speed?).
Pieces of stuff went flying all over the room.
Turned out the scale was TU.
The old PH9 survived but the TP2 and everything else connected to it was toast.
Clean the scale and try to determine if it always happening at the same place.[/QUOTE]


While that sounds like a Great Crash, your last line is the best advise.

[gbensinger]

[QUOTE=#2#;55468]This has happened a few times in the past (maybe 4 times in the last year). Now, it has happened twice in the last two days. While moving manually with the jog box, the machine will 'jump' in the +y direction. It will only move an inch or so and then be back to normal. Needless to say, it scares the poo out of the operator. After it does this, it kicks up an error that reads "Z-axis excess lag error"

According to previous posts, that lag error is because of movement that is unexpected. I find it odd that it is a z-axis error instead of a y-axis error. I suppose it could be moving in both y and z but more easily noticed in y. I believe the lag error is a result of the jump so I think if I fix the jump, the error will not occur.

Anyone know what could be causing this jump? Do you think it could be the joystick going bad?[/

[gbensinger]

What type of CMM do you have ? i'm running a Tarus with the PH9 and it was doing basically the same thing. on my jog box, if you just pushed on the enable and nothing else the cmm would move by itself all axis's . ( i had to get a new jog box. ) but when i was getting the lagg error, i ended up shutting the cmm off over night , every night, until i cleaned out the controller, which is a Brown & Sharpe 32, it was really dirty. that solved my problem.