Is there a code to lock the spindle on VMC? Yasnac-MX3
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  1. #1
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    Default Is there a code to lock the spindle on VMC? Yasnac-MX3

    Like the title says, I'm wondering if anyone knows if I can lock the spindle rotation in a certain position on my Kitamura VMC with a Yasnac MX3 control.

    Thanks,
    gm

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    Try M19 orient spindle.

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    What does your manual say? If you don't have any you can download them from Yasnac. They would tell you the G and M codes used.

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    M19 will orient the spindle for the toolchange process. For any other positions, that functionality would be the responsibility of the machine builder, not Yaskawa.

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    Thanks for the replies.

    I couldn't find anything in the manual regarding "locking" the spindle. M19 does "orient" the spindle for tool changes but it does not hold the spindle in a fixed position, stopping it from turning.

    I'm trying to hold the spindle in a fixed position to make a small broaching type of cut. Not sure if this is possible, (or advisable), on a VMC.

    gm.

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    Some machines just can't do that. On most that I've seen, an "M19" will "lock" the spindle, but softly. You can turn it a bit, and the spindle will resist you and turn back, but not very hard. On some, including the Haas I have here, "M19 P180." will orient the spindle 180° off from toolchange position. I believe I can orient to any whole degree position. This is used for probe calibration.

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    On mine, M19 won't lock the spindle rigid enough to broach, but it should still hold that oriented position fairly well. Depending on what you need size and accuracy wise I would be willing to try it. Make the broach so the cutting edges are as close to the spindle centerline as possible.

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    Yes, orientation and locking are two very separate functions. Locking via a shot pin or brake mechanism is pretty rare on a machine new enough to have an MX1 control let alone an MX3.

    Orientation on your machine is simply the spindle drive applying a holding current to the motor windings and balancing that current with a polarity signal of a magnetic sensor. If the oriented position is deviated outside of range by external forces, the spindle will often do a couple fast rotations in an attempt to re-orient. For that reason many machine builders will apply a warning label near the spindle prohibiting the tightening or loosening of a collet of a toolholder in the spindle.

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    On my fanuc machines, if I M19 at the tool change position, the brake releases after I move the Z down about .100". If I M19 with the Z already down, the brake stays on until I hit the reset button.

    Not sure about the Haas.

    If I was going to broach something, and the machine has a geared head, I would make sure I was in low gear before orienting the spindle- just because...

    What Kevin said I'm sure is right- it's up to the MTB. Both my fanucs are Taiwan machines and they happen to work the same way.


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