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  1. #1
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    Jan 2007
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    Rotary attachment for ULS Laser

    I just bought a generic DIY rotary attachment for use with my Universal Laser X2-600 CO2 cutter/engraver. The attachment comes with a connector with 4 pins (required for a 2-phase stepper motor) but my laser has a 9 pin connector (DB-9-F) that a rotary plugs into.

    Does anyone know the pinouts of ULS' rotary attachment? (I'm an electrical engineer and can make an adapter but need to know the connections). I'm guessing a minimum of 4 connections are required for the motor plus maybe 2 more to tell the laser that a rotary is plugged and maybe 2 more for the home position. I've asked ULS but no reply.

    Any help would be appreciated.

  2. #2
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    Re: Rotary attachment for ULS Laser

    DB9 connectors are very common for use with 4 wire stepper motors. Can’t you trace the connector wires back to the stepper drive? I’ll also bet the setup matches the other axis steppers. Use coil resistance to discover which pins are used.


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  3. #3
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    Re: Rotary attachment for ULS Laser

    Thanks for the reply. I thought of that but looking at the connector, back to the drive electronics won't tell me much. I would need to look from the drive to a connected motor in the rotary (which I don't have yet). The other 3 stepper motors (X,Y,Z) don't use DB-9s so can't use that. I've even tried to act like I have a rotary hooked up and in use and try to see 2 pin-pairs trying to drive the 2 coils of a motor but get nothing. There might also be other pins in the DB-9 that produce a home index function from the rotary plus maybe 2 other pins that actually tell the laser's computer if a rotary is plugged into the DB-9.

  4. #4
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    Re: Rotary attachment for ULS Laser

    Not sure about the index question. I don’t know why a rotary axis would have an index or home.
    Gecko used DB9 for many years and the four pins are 6 -9. If you don’t get an answer just try to connect a cheap nema 17 in various combinations.


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  5. #5
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    Re: Rotary attachment for ULS Laser

    Thanks I'll try those pins.

    Index would tie a CAD drawing position to a repeatable rotation position. But not absolutely necessary.

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