stepper motor suggestions

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  • November 27, 2011 at 11:28 pm #1842
    socketcap
    Member

    I have a collection of 8 stepper motors 4 of them are the same and the other 4 are all different.They are all NEMA 23 housings. The other 4 motors are Superior Electric Slo-Syn steppers that have a fairly high amperage listed on the back of the housings (4.7 amps/phase) so I suspect they might be too big for this shield.

    The 4 that are the same have 6 wires they have no data sheets available on the net so I ohmed them out and had found what would be the center taps (2) and the others I separated into into 2 pairs that designated for coils A and B.

    I am fairly sure that I have grbl in my arduino now because when I open the arduino serial monitor window it has returned–> “Grbl 0.6b ‘$’ to dump current settings”

    Then when I type in “$” it returns—->

    $0 = 755.906 (steps/mm x)
    $1 = 755.906 (steps/mm y)
    $2 = 755.906 (steps/mm z)
    $3 = 30 (microseconds step pulse)
    $4 = 480.0 (mm/min default feed rate)
    $5 = 480.0 (mm/min default seek rate)
    $6 = 0.100 (mm/arc segment)
    $7 = 0 (step port invert mask. binary = 0)
    $8 = 4.800 (acceleration in mm/sec^2)
    $9 = 50.0 (max instant cornering speed change in delta mm/min)
    ‘$x=value’ to set parameter or just ‘$’ to dump current settings
    ok

    Does any of the returned info seem like I might have GRBL on the 328 chip?

    Most of my motor collection are fairly large NEMA 23 motors.

    Does anyone have any tried and proven motors that they would be willing to share with me that I could purchase to use with the GRBL shield ?

    November 27, 2011 at 11:56 pm #1843
    alden
    Member

    You are connected to grbl or you would not have gotten the response. Now you need to connect your motors. The wiring across the connectors is:

    A B C D

    Connect one phase of the motor to A and B. Connect the other to C and D. Just try the motors you have first – if the current is too high the driver chips will get very hot and go into thermal shutdown. This should not damage the chip. Also, you can back off on the current pots if this happens. If you wire the outer phases of the unipolars (the 6 wire ones) and leave the center taps floating they will take less current.

    November 28, 2011 at 10:40 pm #1844
    socketcap
    Member

    I connected the unipolar motors this evening and left the center taps off, wired one coil to A and B, and the other coil to B and C.

    I turned the pot but I still have no motor movement.

    This motor has this info on it: 4.0 volts/phase
    1.6 amp/phase

    I sent “G0x1000” through the serial terminal window in arduino IDE and it returned ok, with no movement tonight.

    I have a 24 volt/10 amp power supply feeding the grbl shield

    I also have a Pentium 2 shrouded CPU fan ready to blow between the shield and arduino when it needs it in the future 🙂

    November 28, 2011 at 11:30 pm #1845
    socketcap
    Member

    I will order a new bipolar 4 lead stepper motor this week to try and if it still wont work after that I would like to send the grbl shield and my arduino to someone and ask if they could please try it at their shop and if they can get it to work, please share with me the combination of parts so that I can replicate it and I promise I wont bug anyone again. I will pay for postage both ways.

    November 29, 2011 at 7:43 am #1846
    alden
    Member

    It sounds like you are having way too much trouble. What you did with the unipolars should have worked. We should arrange to get you a full kit including a pre-programmed Arduino, a grblshield and some plugged motors. Please get in touch off-list if you are interested. We will be putting this out on the store as a standard offering, but we want to make sure you are taken care of. I’d hold off on ordering the motors if you want to go this route.

    December 2, 2011 at 10:12 pm #1847
    socketcap
    Member

    Alden,

    Did my offline e-mail make it to you and Riley?

    December 2, 2011 at 11:07 pm #1848
    Riley
    Keymaster

    Yah bud. Working on getting some motors / kits together. Also, working on other solutions to get grbl on a pre-loaded arduino. Keep ya updated bud.

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