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Openbuilds Lead Screw Travel per Revolution (Atmel)

Discussion in 'CNC Mills/Routers' started by Kevin Paris, Mar 9, 2020.

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  1. Kevin Paris

    Kevin Paris New
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    I'm attempting to configure the "Travel Per Revolution" parameter in Atmel Studio 7. I am using an Openbuilds C-Rail lead screw assembly with 8mm lead, and the reduction pate. Since the pulley ratio for the reduction plate is 1:1, I assumed the travel per revolution would be equal to the lead, which is 8mm. When I used this value, however, the gantry plate only moved about a quarter of an inch. I'm using a Nema 23 (200 steps per revolution with 1/8 microstepping). For the sake of testing, I switched the value to 1.25, and again told it to move 1". It's now much closer, though I'd like to figure out mathematically which value I should be using. Any ideas?

    upload_2020-3-9_11-57-16.png
     
    #1 Kevin Paris, Mar 9, 2020
  2. Christian James

    Christian James Journeyman
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    If it's an 8mm 4 start Trapezoidal lead-screw, I would expect it to move 8mm per revolution. Also, your steps per unit (if it means steps per mm) would be 200 I would have thought (until you're ready to do fine calibration).
     
    #2 Christian James, Mar 10, 2020
  3. David the swarfer

    David the swarfer OpenBuilds Team
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    #3 David the swarfer, Mar 10, 2020
  4. Wick

    Wick New
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    360degrees (one revolution) divided by step angle (1.8) = 200 step per revolution.
     
    #4 Wick, Oct 3, 2022
  5. Alex Chambers

    Alex Chambers Master
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    Full steps, yes. But at 8*microstepping it's 1600 steps/revolution.
    Alex.
     
    #5 Alex Chambers, Oct 3, 2022
  6. Wick

    Wick New
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    True
     
    #6 Wick, Oct 3, 2022

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