New cnc Lathe build.

Discussion in 'CNC Machines and Conversions' started by blighty, Jun 27, 2013.

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  1. Jun 13, 2018 at 12:24 AM #81

    blighty

    blighty

    blighty

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    last week started on the shaft. 4 x 12in ish of EN24. my word thats tough stuff.
    20180605_121725.jpg

    getting smaller....
    20180606_112407.jpg

    starting on the tool holder, also EN24 8in x 2in
    20180606_125825.jpg

    time to fire up the grinder....
    20180609_122015.jpg

    shaft finished
    20180609_151416.jpg

    20180609_222514.jpg
    20180609_222605.jpg


    20180609_222708.jpg
    20180609_222818.jpg
     
  2. Jun 13, 2018 at 1:22 AM #82

    Herbiev

    Herbiev

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    Looking very professional.
     
  3. Jun 13, 2018 at 2:26 PM #83

    oldchadders

    oldchadders

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    These motors (AFAIK) are simple dc motors. I bought one (180v dc) intending to use it on a small lathe. From what you say (and most likely in this day and age) the control is digital - analogue is much simpler and easier to fiddle around with - dc volts is dc volts - with digital, trying to interface different bits of kit is more difficult. I found on Ebay what is basically something like a drill control module ( drills etc usually have a "universal motor" which can be speed controlled with a dc supply) although I used to design such things for industrial use it is much more convenient to buy something which is designed and tested. If you can get something like that, which incorporates a speed control potentiometer, the pot will probably have its outer terminals connected to a low dc voltage and ground, rotating the pot varies the voltage on the centre pin which controls the speed. The pot can be removed and a speed control voltage applied to the connection of the centre connection and ground. I eventually gave up on this motor (because of its size and weight) and I am planning to use a 24v dc motor off an electric scooter (bought off Ebay) because it is easier to mess around with lower voltages with less need to isolate various control modules.
     
  4. Jun 13, 2018 at 2:41 PM #84

    blighty

    blighty

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    oldchadders...
    thanks for the info. it would of been nice to use the board from the treadmill from where the motor came from, but had a few problems using it. as you say, it was digital and we/forum couldn't work out where the 0-10v would go. Plus as it's intended for a lathe, being able to revers the motor with an M4 code is a must. I ended up buying a KBCC-225R dc controller board that should do the job. I haven't wired the motor up yet to see if it all works. as not got the Pokeys controller yet. will be ordering one this week as i need it to test the ATC when its finished........... anyone got a macro for an ATC??
     
  5. Jun 13, 2018 at 4:53 PM #85

    oldchadders

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    Slower and less power by the ratio of 180/220
    !80v is roughly the dc output from half wave rectified 240v ac (ie it is only using half of the ac input ctcle, whereas you woyld get app 220v dc if it was full wave rectified (ie the controller is only using one thyristor rather than 2, the latter requiring more complex circuitry (ie more expensive).
     
  6. Jun 13, 2018 at 5:16 PM #86

    oldchadders

    oldchadders

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    The original probably used full wave rectification, with a pair of thyristors, rather than half wave with one (full wave will give a smoother operation of the motor - in practical terms you would probably not notice the difference. Reversing can be obtained simply by swapping the connections to the motor. How are you physically connecting the motor to the outside world? Pulleys, Gears? You can always adjust the ratio to increase your final output shaft speed to compensate for the lower supply voltage.
    Power = 2πNT where N is speed and T is torque
     
  7. Jun 13, 2018 at 5:21 PM #87

    oldchadders

    oldchadders

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    I've got a 180v treadmill motor which I no longer need which you can have if you want it.
     
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  8. Jun 13, 2018 at 5:22 PM #88

    oldchadders

    oldchadders

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    Thinking about it, I probably have a speed controller too.
     
  9. Jun 13, 2018 at 8:08 PM #89

    blighty

    blighty

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    4 posts and only understood 2 of them, guess what ones :)
    not to good with the ins and out of the electronic stuff. my thought was to wire it all up one day and see what happends as to the rpm of the motor. then make gearing decision from there.

    drive from the motor will be pulleys, as to what sort don't know yet, but probably single V belt with 2 speed ranges.

    thanks for the offer of the motor and ESC. unless you live in the UK might have a problem with posting. plus, it will live in me shed for ever and a day till i think of something to do with it.
     
  10. Jun 13, 2018 at 9:05 PM #90

    oldchadders

    oldchadders

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    I am in the UK, near Buckingham. My thought was the 180v motor would match the output of your controller.
     

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