z axis high when tool changing

Ozone · Nov 25, 2018

My Fadal VMC 15 sat for over a month. Now my z is off around .100, when changing tools, ie mostly won't change them. It's too close to machine zero to reset with CS. I've tried everything. What am I missing? Thanks, I have a part order of 60 pieces to get out ASAP

johneezreno · Nov 25, 2018

Encoder adjustment

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Tungsten Carbide · Nov 27, 2018

My old Fadal 4020 does the same thing. After cold start, I look at the axis marks. Occasionally, the z axis is about 1/8" off (and that prevents tool changes). I hand jog the z until the marks line up, and re-do cold start. Then the problem goes away.

johneezreno · Nov 27, 2018

If you have the manuals, it covers the encoder adjustments. Basically taking cover off of encoding. Loosen the resolve and turn it until your cold start position Mark's line up. There is a height dimension to obtain by manually swinging the tool changer over to the spindle

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triumph406 · Nov 27, 2018

Ozone said:
My Fadal VMC 15 sat for over a month. Now my z is off around .100, when changing tools, ie mostly won't change them. It's too close to machine zero to reset with CS. I've tried everything. What am I missing? Thanks, I have a part order of 60 pieces to get out ASAP

Your probably off by 1 turn of the Z axis leadscrew.

Jog the Z-axis to line up with the Z-axis mark, and redo CS.

If you have a DC machine, you can rotate the resolver, but if you have to do that then there's a bigger problem somewhere that needs to be checked.

D Nelson · Nov 27, 2018

If it’s low try moving it up over the mark and reset cold start if that works then loosen small screws on the Little tab and adjust it so next time you can get it perfect

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Ozone · Dec 29, 2018

Thanks, I am leery of what changed. It is still not working. The marks are aligned. Could the tool holder be bent or misaligned? Yes it is a DC machine.

CarbideBob · Dec 29, 2018

triumph406 said:
Your probably off by 1 turn of the Z axis leadscrew.

Jog the Z-axis to line up with the Z-axis mark, and redo CS.

If you have a DC machine, you can rotate the resolver, but if you have to do that then there's a bigger problem somewhere that needs to be checked.

^^^ This.
It's a sign that the reference mark on the encoder is too close to the the home switch contact.
Dirt on the ramp, older slower switches can make this show up for no apparent reason.
Clean both or move the ramp a tad.
Bob

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