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  1. #11
    Quote Originally Posted by Slixxor View Post
    The bed size is 1300x1000. I am happy to run whatever I need in order to be able to mill aluminium comfortably. I opted for the 34's due their torque at low rpm. Can anyone suggest a nema23 suitable for the application, they certainly are cheaper :)
    nema 34 is overkill and won't work as expected try these https://www.cnc4you.co.uk/Stepper-Mo...YGH301B-Nema23 more than capable for that size of machine
    ..Clive
    The more you know, The better you know, How little you know

  2. #12
    Thanks Clive S,

    you've saved me $420 AU. Does anyone else agree with Nema23 23HS45-3504S being the best choice for a steel gantry and Z axis?
    that will likely weigh over 30kg?

  3. #13
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 11 Hours Ago Has been a member for 4-5 years. Has a total post count of 1,005. Received thanks 170 times, giving thanks to others 5 times.
    I'm using these in a slightly larger machine, steel gantry probably weighs around 50kg, and I'm not expecting any problems. It's a very common setup. You do need to drive them with a suitable voltage - 60V or more.

  4. #14
    Agree with 23's .. ball screws = 10 mm is ok (5mm better axial load deflection needs looking at )
    I assume you are in Aust, so these links might be of assistance. Both are in Melb.
    http://www.homanndesigns.com/
    http://stores.ebay.com.au/CNC-AND-CU...=p4634.c0.m322
    CHECK THE SCREW LENGTH This guy normally lists travel length ..

    Paul

  5. #15
    Thanks @Paul3112, saved in favourites. :)

    This is the kit I ordered but had modified for my lengths: http://www.ebay.com.au/itm/331320314...%3AMEBIDX%3AIT

    This is the motor kit I wanted to buy: http://www.ebay.com.au/itm/171994192...84.m1436.l2649
    This is the motor kit I am considering now: http://www.ebay.com.au/itm/171937212...84.m1436.l2649

  6. #16
    Quote Originally Posted by Slixxor View Post
    This is the motor kit I am considering now: http://www.ebay.com.au/itm/171937212...84.m1436.l2649
    Kits are hardly ever a good idea as they are never matched. You need motors with very low inductance and drives that can handle 68V volts to get the best out of them. Go for a toroidal type power supply rather than a switch mode type.

    Before you start spending hard earned cash it might be better to do some research as these parts can make all the difference between a good machine and a duff.
    ..Clive
    The more you know, The better you know, How little you know

  7. #17
    Quote Originally Posted by Clive S View Post
    Kits are hardly ever a good idea as they are never matched. You need motors with very low inductance and drives that can handle 68V volts to get the best out of them. Go for a toroidal type power supply rather than a switch mode type.

    Before you start spending hard earned cash it might be better to do some research as these parts can make all the difference between a good machine and a duff.
    Thanks Clive, I dont have an issue with switchmode PSU's. As a worst case i'll make a quick back EMF circuit and put some filtering caps across the bridge.

    You are dead right about the affect of inductance on supply voltage, especially at higher RPMs. So I have found a reasonably priced torquey Nema23 model

    http://www.ebay.com.au/itm/3PCS-3Nm-...EAAOSw37tV85jU

    inductance is 3.8mH - The lowest i've seen on ebay in that size.

    What is everyones thought on this motor?

  8. #18
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 11 Hours Ago Has been a member for 4-5 years. Has a total post count of 1,005. Received thanks 170 times, giving thanks to others 5 times.
    Quote Originally Posted by Slixxor View Post
    Thanks Clive, I dont have an issue with switchmode PSU's. As a worst case i'll make a quick back EMF circuit and put some filtering caps across the bridge.
    Not quite sure whether you mean you'll use a switch-mode supply or not. However, the linear supply is often better to drive steppers; the duty cycle of the load is relatively low, even though the peak demand can be high. With a SMPS, you need to rate it for max peak load to avoid it going into current-limiting where a linear supply can handle the peaks even if rated for average load. But then, you can buy cheap SMPS from China...

  9. #19
    My 1000x700 build uses Mema 23 425oz 3amp at around 20 each, and they plenty of torque and speed, forgot to change DOC other day set to 3mm 6mm 2 flute for MDF (cuts MDF 6mm 2 flute at 15mm DOC Regularly), so ended up slot cutting 5083 aluminium at 3mm DOC 6mm 2 flute 1000mmpm FR, stepper torque was not a problem and it cut without incident but was working harder than it would normally.

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