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Questin on 4th axis motor

Discussion in 'General Talk' started by selkov, Feb 28, 2019.

  1. selkov

    selkov New
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    So I will be routing a deep pattern into a round object [like a police baton]. I will need to make multiple cuts to achieve the depth I require.

    Will A nema 23 motor on the 4th axis be able to hold the work piece in the same spot while I do so or do I need a diving head?

    Will I be able to rotate the work piece and return to the same position accurately?

    -Eds
     
  2. ljvb

    ljvb Veteran
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    I would go with no.. maybe.. possibly.... What you could try to do is create a jig with index points similar to what is on a lathe head stock. I would not put lateral pressure on the spindle of the stepper motor. They are designed for rotational force, not lateral.
     
  3. Giarc

    Giarc Master
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    It depends on how it is connected to your Chuck. If you look in the lathes section if the builds, you can see how a couple have been done. I recently ordered a rotary axis to attach to my CNC to hold me over until I build a CNC lathe.
     
  4. ljvb

    ljvb Veteran
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    I have a Jet lathe, so I won't be buying or building another one. Eventually I plan to add an xy cnc getup to my lathe for templating and duplication. In the Interim I am just going to use 2 pieces of extrusion with some plates and wheels, a post with a small bearing at the end to follow acrylic templates I will use the CNC to cut out.

    Later on, I will see if I can add another stepper to drive the outside wheel of the lathe head stock (will have to tap holes and add a large gear) to rotate the material to set points (the lathe has 8 index points built in, but its a manual screw/unscrew process) to do fluting and other fun things to lathed items, and ultimately, I will automate the process using the xy setup with the rotational stepper.
     
  5. selkov

    selkov New
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    I guess what I am doing is quite similar to fluting. I am unsure as to weather I understand the answers. Will the stepper motor be able to hold the work piece from rotating while the fluting process is under way or will it need a mechanical device to hold it from moving.
     
  6. Gary Caruso

    Gary Caruso OpenBuilds Team
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    Direct Drive, no it will not hold well enough, but with sufficient mechanical advantage from a gear or belt reduction you will. If you google "belt drive 4th axis" you will find examples like this..

    upload_2019-3-1_12-20-35.png
     
  7. selkov

    selkov New
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    Actually that is almost the same thing I had in mind. Sorry said i was new. So this will stay Put? No need of mechanical lock down?

    upload_2019-3-1_13-44-44.png
     
  8. ljvb

    ljvb Veteran
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    That is exactly what I was referring too.. :) except I plan on automating mine. similar to the picture that Gary posted, except instead of a separate unit, I will be using the outer spindle of the headstock and a stepper/arduino in conjunction with an xy axis.. so I don't have to do it manually.
     

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