Need Help!- Fagor 8055 Mill won't home

[cam1]

Hi:

My Fagor 8055 equipped VMC won't home. Usually all that required is to press the ZERO key, and hit cycle start. All 3 axes then home. Now when I perform that operation the Z axis homes, and the machine sits there with a message at the top of the screen saying "execution", the xX and Y axis remain stationary. Now when I just select the X axis and press the ZERO key, the X axis will home itself. The same applies to the Y axis.
Sound like the machine is waiting for something to happen.

any Ideas?

[cut more]

Sounds like the z axis limit may not be working. I have a motionmaster router with 8050 control. It did something like that a few years ago and it turned out to be a sticky limit switch.

Cutmore

[cam1]

Thanks cut more:
When I initiate the homing routine, the Z axis does home (as indicated on the Z axis display a red dot beside the "Z" indicating homed). Good starting point to assume that it's a limit problem.

thanks

[philserveng]

hi guys, I think you are on the right track. some machines have a second switch at the Z axis home position to allow toolchange. This is a second check to ensure the Z axis toolchange position is correct. I suspect this switch is staying open circuit, or the reference position is different to what it was.

[cam1]

Problem Solved:
When machine completes Z home, a relay is energized (signal to tell XY to proceed with Home routine). This relay was sticking in the open position. We pulled a spare relay and replaced it. Machine is Homing by itself again.

thanks for the advise

regards

[cut more]

Glad to help,
I have found that everytime our machine is spacing out, there has been a sensor or limit switch not doing it's thing.

Cutmore

[cam1]

Arggh:
Machine wouldn't home again, think I've got it solved this time. The following error on the Z axis was causing the machine to pause on homing. We increased the allowable following error on the Z by a few 10ths, and now it appears to be behaving.

[radha_park]

Hi,
i am working with Fagor as a tech.manager in Singapore,
havu check the inposition width parameter.If it is very small value,depends on the mech condition it will not complete the block execution and hang there.Try to play with the inpos parameter for the respective axis,to identify the problem.By the way what is the drive system used.u may have to tune the drive for zero speed

[cam1]

Hi:
The drives are Yaskawa ( I understand that Yaskawa also manufactures the drives for Fagor). Were we on the right track when we changed the following error on the Z?, or should we go back and change the inpos parameter for Z?

regards

[radha_park]

First of all let me understand the problem properly
1.in which mode u r doin the homing?.If it is in ISO mode r u doing it in 1 axis at atime?
2.When u r giving a home command for an axis,Does the axis moves and try to find the decelaration limit and then slow down to find the REF position?.Normaly after finding the REF position it will assume the position and display inposition,to tell us the commanded block has been executed.If it still continues to be in execution mena that it could not reach in position because of following error or may be the axis is drifting so that it could not reach the inposition specified in the parameter.This case u should check the inpostion widthe parameter and the following error value in the screen(There is a display for showing following error.
3.By the way where is yr location so that I can ask our nearest branch office to guide u.i hope u understand that Fagor have branches all over the world.If u still have problem.pls send me an e_mail
radha@fagorautomation.com.sg

[cam1]

Thanks Radha:
The machine is under warranty, and just to let you know, we have rec'd excellent service from Mohit out of Fagor headquarters in Toronto.
We are homing from the conversational side of the interface.
The Z axis seems to be homing normally, (decel limit, then slowing down to find the ref position. It then reverses movemet in Z.

We tried the machine this morning, and after Fridays adjustment of Z axis following error, it is homing all 3 axis automatically.

thanks for the support.

cheers

[philserveng]

I think you may have mis-understood what you were told.

You need to make sure that there is no underlying mechanical friction problem with the axis. Check the lubrication of the slideway and ballscrew nut, if they lack grease / oil they can go tight, this will increase the following error and that is why the in position error occurred.

Opening up the inpos window parameter will only mask the problem until things get worse or even seizes up. Check the motor current, and feel if the motor gets hot after a short while.

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