METAL PRINTING (STAINLESS STEEL) WITH YOUR DUET 2 + DUEX (HELP)



  • Hello everyone, how are you ?

    I am new to the Duet universe and have little knowledge about step motors and would like help and guidance.

    I own a TRONXY (Core XY) printer (500x500x600) I just threw all of its electronics away and did its reconstruction using Duet Ethernet + Duex5 + Titan Volcano + 1400w Heated Bed using SSR.

    I made this printer to make prints on metal (stainless steel 314) using using filament from Basf.

    However I am having a serious problem now, the printing table is getting heavy and the Z axis motors are not coping.

    I thought about making an upgrade of these engines to NEMA23 and I would like, if possible, the indication of some engine model and the other accessories that I will need to do this (BOM).

    I appreciate if you can help me.

    Thank you

    Fabio

    IMG_2931 2.jpg



  • You might be able to gear down the z axis; odds are you don't need high speed and can trade some speed for some torque?



  • @bearer said in METAL PRINTING (STAINLESS STEEL) WITH YOUR DUET 2 + DUEX (HELP):

    You might be able to gear down the z axis; odds are you don't need high speed and can trade some speed for some torque?

    Dear Bearer, how are you ?

    It has several problems;

    1. What happens is that when the printing is finished the motors are de-energized. And the same printing goes down alone at high speed due to the weight of the piece that was printed (Weight reaching up to 12 kilos).

    2. The Z axes are responsible for the constant lifting movement, avoiding the spreading of metal by the printing nozzle. As the printing is done, the motors start to work with a lot of weight and this starts to generate gaps between the printed layers.



  • Right, sounds like you need a little more than just a little boost that you could have achieved with a simple gear.

    As far as gearing goes it will help with holding forces; using a worm gear will help the bed maintain the position when not driven even if you end up needing a stronger motor.

    Anyways, there are a few people here with way more experience with larger stuff that will sure chime in, in due time.



  • @bearer said in METAL PRINTING (STAINLESS STEEL) WITH YOUR DUET 2 + DUEX (HELP):

    Right, sounds like you need a little more than just a little boost that you could have achieved with a simple gear.
    As far as gearing goes it will help with holding forces; using a worm gear will help the bed maintain the position when not driven even if you end up needing a stronger motor.
    Anyways, there are a few people here with way more experience with larger stuff that will sure chime in, in due time.

    All help is welcome!

    Could you tell me what type of gear you use or would use in this case. I am grateful if I could link a product so that I can make the purchase.



  • What geometry are your Z leadscrews? A lot of printers come with 4-start leadscrew / 8mm lead that are really susceptible to droop. Just switching to a 1-start / 2mm lead will give you some mechanical advantage and only require changing the screws + nuts.

    4 start:

    Screen Shot 2020-07-31 at 6.44.14 PM.png

    1 start:

    Screen Shot 2020-07-31 at 6.43.38 PM.png



  • Dear Whopping Pochard, how are you ?

    I wear Pitch 2mm Lead 8mm.

    what would be the suggestion of size and model?


  • Moderator

    2mm lead or even 1mm lead would have much less tendency to auto rotate downward when deenergized.



  • @Phaedrux

    Dear Phaedrux, how are you?

    1. Would you mind posting a link where you would have the indication of a product within this specification so that I can make the purchase.

    I apologize, but like me, other users who are new to the DUET universe are not as familiar with products and components and we are grateful to share the generosity of colleagues like you when sharing their knowledge and time.

    1. In addition, I ask you to be kind enough to indicate some products necessary for the use of NEMA32 engines (high torque). Because the metal prints that I end up making are up to 15 kilos or more and I notice that the engines overheat a lot.

    After the project is finished, I intend to post here step by step so that other people can use it.

    King Regards

    Fabio



  • @FABIO_F said in METAL PRINTING (STAINLESS STEEL) WITH YOUR DUET 2 + DUEX (HELP):

    I wear Pitch 2mm Lead 8mm.

    you probably mean 8mm pitch and 2mm lead. one roatation gives you 2mm travel?

    changing to a 1mm lead would effectively double your torque as well btw.

    duet 2 wifi can do max 2.4a motor current (with cooling) of you want to drive larger motors you will need external drivers or a duet 3 that can go up to 4.4a (6+ peak)



  • My printer has a cantilever bed that weights 25-30 lbs and is being lifted with a single nema17 and a 3-1 pulley. You want a quality stepper with a good detent torque.


  • Moderator

    @FABIO_F said in METAL PRINTING (STAINLESS STEEL) WITH YOUR DUET 2 + DUEX (HELP):

    Would you mind posting a link where you would have the indication of a product within this specification so that I can make the purchase.

    I don't know where you are located, but the lead screw I am talking about would have specs like this one: https://spool3d.ca/lead-screw-8mm-1mm-pitch-1mm-lead/

    A NEMA23 would be a good choice for the Duet2 because you can still find some good options at that size within the 2.4a limit of the Duet 2 drivers. Going up to NEMA32 would become problematic.


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