JOHNFOD FANUC 18M

[PICMAN]

Hello,
I am having a problem sending Z axis home after we set up this machine in my shop. We had to remove the servo (Z axis) to get the machine into my shop. Now I can't get Z axis to reference home position. I tried fooling the soft limit in parameter 1320. I also tried P cancel as well. No luck.
If anyone has a solution, I appreciate it.
Thanks,
Picman

[hitachibos]

whats it do ?
does it go in the home direction and slow down? then alarm out with hard OT?
does it not get to slow down and just alarms out with a soft over travel?

if soft over travel then open up that 1320 parameter

if it slows down then hard overtravel then you want to find "Grid shift" parameter and start by cutting it in half.

if that does it then you want to get it right by useing a known height block on the table.
bringing down the head till block just slides under. then write down machine position for Z and send machine back home. do the math between the two machine positions and adjust the "Grid shift" parameter as needed to give you the factory stated travel between table and spindle nose.

[PICMAN]

Yeah it over travels every time I send it toward home and yes it slows down as it should, but I haven't tried grid shift. I will though, Thanks

[hitachibos]

sounds like it reads the slow down but grid shift is too large and it hits hard over travel before it reaches the grid amount.

if you can get this set to factory distance from table up you should be ok but if you just fudge the numbers you will have tool change issue as well.

[PICMAN]

How about 1829 err limit stop, z reads 500. If i change it to read 99999999 could that possibly work? My grid shift shows z-15494 and x,y are 0.

[hitachibos]

just cut your grid shift in half make it 7500 see if it returns to home

[PICMAN]

The machine is still over traveling when I do that. I would move the over travel dog, but here that is a last resort.

[PICMAN]

THANK YOU