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Sturdy Motorized Photographic Copy Stand

Discussion in 'Other Builds' started by Cam Garrett, Feb 1, 2023.

  1. Cam Garrett

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    Cam Garrett published a new build:

    Read more about this build...
     
  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    1. Reduce your screws to 8mm. 10mm will bottom out in the channels.
    2. Cast corner connectors should be fine. Strength is more than adequate and they have a dull matt finish that shouldn't cause objectionable reflections. If you do think there will be an issue, Krylon will easily solve the problem. Note, you may need to file the tabs off the bottom of the connectors to seat properly against the face of the extrusion.
    3. Can't offer a specific answer on the motor question but be sure and get one that is heavily geared to reduce speed. Every turn moves the gantry 8mm so a 1200 rpm motor will get you in a world of hurt very quickly. The other problem with motors is they spin freely. The gravity load of the camera on the gantry may cause the lead screw to turn on its own so you'll want a motor with sufficient gearing that it won't move easily. Stepper motors are designed to stay put but the aggressive lead screws that come with the actuator assemblies have been known to overpower the stepper motor's detent torque. Note, you'll need to find a way to mount the motor as the actuator kits are specifically designed for NEMA 23 steppers.
     
    Mark Carew likes this.
  3. Cam Garrett

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    thank you for your response and good advice.
    next question: when i order the linear actuator kit without the motor is the motor mounting mounting hardware and flexible coupling still included?
    i have included an image with the parts circled in red. motor mount parts.png
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    I haven't bought one in a couple years so I can't say off the top of my head. But according to the parts list yes, although you might want to confirm that with the shop Contact Us : SUPPORT (openbuilds.com).

    BTW, the shop is closed on weekends so it'll be tomorrow before they get back to you.
     
  5. Cam Garrett

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    thanks to OpenBuilds for getting back to me with the answer to my previous question. answer: yes, it comes with all the parts in the parts list.
    new question:
    i would like to use the Extension Limit Switch on each end of the linear actuator. i noticed that another build titled "MOVABLE ART TO SCREEN WALL-MOUNTED TV " used one (apparently not from OpenBuilds) and he noted that it had a diode attached. (perhaps because he was using a DC motor and power source?) ....see photo.
    my question is, does the Extension Limit Switch have a diode in it and/or do i need one? CLOSE-UP OF DIODE - MOVABLE ARTWORK.jpg
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Those were our previous generation switches, still documented here docs:blackbox-x32:connect-micro-limit [OpenBuilds Documentation], but not recommended for new designs

    Normally one does not need diodes - so no idea what the use case in the picture was, and you would not need it if you wire your Xtension Limits as Documented in the BlackBox Documentation: docs:blackbox-x32:connect-xtension-limit [OpenBuilds Documentation]
     
  7. David the swarfer

    David the swarfer OpenBuilds Team
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    my guess is the switches were switching power to the DC motor, the diode provides automatic 'can approach and stop and can then reverse away but not drive the wrong way'
     
    Peter Van Der Walt likes this.

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