[aghobby]

We recently purchased a Kitamura Mycenter-1 but we have a problem with the Z axis. The Home position is a little offset, the tool changer arm hit the head when it came to change the tool, the Z home must be set .250 higher.

Does a gentleman know how to do this procedure?

Thanks,
Alex

[Al_The_Man]

The adjustment can be made with the grid shift, it is probabally para 0510 for the Z axis, if you have the maintenance manual it should explain it.
Something may have changed mechanically, dog position, home switch position, or encoder position relative to ball screw etc.
Al.

[aghobby]

Well, i don't get any manual with the machine...


Could you be more explicit?

What is grid shift?

Thanks ,
Alex

[Al_The_Man]

The home is done by the encoder detecting the one-revolution marker pulse after it sees the home switch, rather than tediously adjusting the encoder or dog etc, the grid-shift parameter electronically shifts the marker point by the amount in the grid shift parameter, entered in amount of encoder pulses to shift.
Al.

[aghobby]

Well, your a pro, i had needed to shift the value from -950 to 3200.


Work fine now, but a lot of work to do , the tool changer arm overshoot.....I may need to tighten the brake and maybe there some mechanical play somewhere....Will try to solve by the weekend.....


Thanks for the tips,

Alex

[aghobby]

Well, the problem persit , each time we shut down the machine, when we power-up again we need to readjust the grid shift because the motor is alway in Z overtravel alarm and the tool changer arm will hit the spindle??

Any idea of what can cause the loss of this data? There no mechanical play in the ballscrew/bearings/coupling....

Thanks,
Alex

[Al_The_Man]

Did you check the Z home limit for loose/sticking situation?
Just replacing it may eliminate the problem.
Al.

[scappini]

We have a Kitamura MyCentre 2C with Fanuc 11M Controller. We find our Z home is fine but the very first Automatic tool change will Jam, once jogging it back home. From then on it is all good for the day. We too are a bit bewildered by this. Although our Z home is all Good.

Cheers

Scappini

[RRL]

I have heard of this problem.
You say it is the FIRST tool change of the day, is this correct?

If so you can try two things;

1. Leave the spindle empty for one night and try the tool change in the morning.

2, If this works you are having a problem known as taper lock. Most imes this occurs due to sticky coolant on the tool tapers! I suggest cleaning ALL tools, spindle taper, and magazine pockets with "scotchbrite" and WD40(or some GOOD rust inhibiter)! Them spray a light coating on all AFTER cleaning.

This should take care of your problem.

Robin