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Moving heavy load with Nema23 belt actuator

Discussion in 'General Talk' started by Cloudbase Engineering, Jun 2, 2020.

  1. Cloudbase Engineering

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    Hello All,

    I am under the gun time wise to design something to move roughly 20lbs 34" of travel in 3 to 4 seconds. Normaly I would design something from scratch as I have 30 years of linear mothion stage design experience, but for this project to show proof of concept, I need to go with off the shelf items as i have 3 weeks to design build and do software. I know it can move the load with the Cbeam leadscrew actuator, but the lead pitch is too slow and wont meet the transit time. If a faster screw upgrade is available that is possibly an option. If so let me know?

    However I am leaning toward buying 2ea of the Nema 23 1000mm belt driven actuators for this application since I can always add a 3 or 4 stack stepper if I need more torque. Also will have the two in parellel to each other to help with the load. So if anyone has experience with these actuators do you think my application is doable? Also need them to be fairly quiet and thought about using a quiet stepper drive, but know that trades torque for the silent ability and unsure if enough margin there. The driver I am looking at is capable of 6 amps each motor continuous. Fine accuracy is not essential for this application. +/- .06" is fine.

    Next question if someone from openbuilds replies are the items in stock? I need 3ea of the belt stages and may buy 1ea Cbeam leadscrew version. I also may swap out the extrusion for a 20x80 but I believe these arrive as a kit and not prebuilt so that may be easy to do. Would love to actually talk to someone at Openbuilds as htis has potential for large qty if the proof of concept gets me the PO. If able please PM me your contact number.

    Open to any advice and Take care,

    Marc
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Please direct stock availability questions to the store at http://support.openbuilds.com/support/home

    They will also assist with this
     
  3. Cloudbase Engineering

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    Peter,

    I emailed Openbuilds part store and sales 2 days ago and no reply. That is why I began to as questions here. Rather than post my number on a forum, if you go here you will find it. I just need a few things answered to complete the deign and get parts on order.

    Cloudbase Engineering Innovative Camera Mounts for your Aircaft | Innovative camera mounts for aircraft. Attach your Gopro, Garmin, Contour or other action camera to your airplane's wingstrut. Stable video for your Cessna, Aeronca, Piper, Kitfox, Aviat, Bushplane & Biplane etc. Designed by a pilot for pilots. Proudly made in the USA with a lifetime warranty.

    Best regards,

    Marc
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Check your spam folder? Usually replies go out quite quickly
     
  5. Cloudbase Engineering

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    I am thinking for my needs perhaps open rail is better as it will likely handle the loads better than the smaller Vtype wheels used on amost 3D printers.

    marc
     
  6. Cloudbase Engineering

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    Oh will do... hold on
     
  7. Cloudbase Engineering

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    Aw crap you were right they replied yesterday will follow up. However any chance you know any of the answers ot my orriginal message on if I can move 20 lbs with 2ea nema 23 belt actuators?
     
    Peter Van Der Walt likes this.
  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Somewhat outdated testing specs here: https://openbuilds.com/uploadfiles/Part Specs/OpenBuilds® Actuator Tests_V2.pdf
    Some notes on why you definately can do better than the test results:
    - the test used 1.25A stepper drivers - for a 2.8A motor (;
    - No real acceleration tuning etc
    - Using good drivers (like DQ542MAs) with a higher drive voltage (36v) will probably be fine
    - But as these things go, get parts in hand and try them out... You know what you expect of it, you know how it should feel and whether it will suffice, and you will be the best to evaluate them. Order 1 to play with!, thats going to be the best way forward - theory only gets you to circle around obsession, where perfection quickly gets in the way of good enough - prototyping gets you moving forward into the game faster. With one in hand, give it hell, see where it breaks, then you know whether its overspec'ed already, or whether you need to double up, or use bigger motors, or whatever


    V-Slot would probably be better, just use the best wheels: Xtreme Solid V Wheel Kit (harder material, can crack under shock loads, but less deflection (still in the order of microns though) or even Solid V Wheel Kit (runs quieter, harder to crack, but can deform with static loads, deflection still in the range of microns) - solid wheels crack less likely than V-Wheels on OpenRail. - note these are not the Mini V-Wheels you mention: (those are Delrin Mini V Wheel Kit and the tiny bearing is the limiting factor for these)
    For weight handling just add more wheels. 3 on a side instead of 2 for example.

    Also, checkout How to calculate V-Slot® deflection - not sure that affects your use case - probably more for the CNC guys that have to maintain precision on the XY plate with a gantry stretched over the bed
     
  9. Cloudbase Engineering

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    Thanks Peter. Will get the design going now... To do a full test I need 3 actuators and willplan for that.
     
    Giarc and Peter Van Der Walt like this.
  10. David the swarfer

    David the swarfer OpenBuilds Team
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    you might want to consider this sort of thing...
     

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