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DC 12-36V Lathe Press 555 Motor, Torque vs speed

Discussion in 'Power Electronics' started by HelpReceiver, May 21, 2018.

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  1. HelpReceiver


    May 21, 2018
    Good day,

    I have a DC 12-36V Lathe Press 555 Motor, purpose to cut cow bones, motor has 2 options, in terms of power source

    1 - 36 volt 3 amp power supply

    2 - 12 volt 5 amp power supply

    which of the power supplies would give me the best result in terms of cutting the bones fast, and if a 24 volt 4 amp power supply could be viable and a good choice.

    Thank you.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    26 V * 3 A = 108 W, 12 V * 5 A = 60 W. Isn't it obvious which option delivers more power?
    The motor will very likely work on 24 V / 4 A, but you'll have try and measure the actual current consumption from 24 V.


    May 20, 2017
    Current consumption will of course vary with load.
  4. HelpReceiver


    May 21, 2018
    so what ur trying to tell me is that the higher the wattage the more it has power, alright.

    12 volt 5 amp = 60 watt
    36 volt 3 amp = 108 watt

    so the 108W has more power ok,

    i have another question.
    higher voltage means faster spin?
    higher amp means more torque yes ?

    if so,

    the 12 volt 5 amp, has 2 amp of extra torque,
    and the 36 volt 3 amp, has faster spin rate.

    now i do understand the 36 volt 3 amp, is 108 watt therefor has more power, but does that mean it will cut the bone faster.

    and i'v uploaded a pic of the motor specs

    Thank you.

    P.S plz bare with me im new to this field.

    Attached Files:

    Last edited: May 21, 2018


    May 20, 2017
    Applying more volts to the motor means it will demand more power (amps). It is roughly a square law where doubling the voltage means the motor will demand 4 times the current. If your power supply can't deliver the extra current required, the power supply volts will collapse to a point where the current demand can be met. That will also make the supply warm up fairly quickly.
  6. HelpReceiver


    May 21, 2018
    so in conclusion, in order to cut the bone fast, u would recommend 36V 3Amp power supply for my motor ?
  7. Alec_t


    Jul 7, 2015
    The rated output power of the motor is 75W, so you won't get >100W out of it (except, perhaps for very brief periods) without overheating it.
    Your supply will have to be rated to handle the motor's start-up/stall surge current, which could be several times the expected 3A or 5A. Would your 24V 4A supply handle the surge?
  8. Minder


    Apr 24, 2015
    That is a Very (physically) small motor and at 36v would run almost 10krpm when unloaded.
    Does not appear to me to be a suitable motor for cutting large animal bones.
    Torque= current, rpm=voltage.
    kellys_eye likes this.
  9. kellys_eye


    Jun 25, 2010
    I'm with @Minder here - that's a crappy little motor if the 'bone cutting' you plan to do is anything more than just chicken legs...... with the meat removed. Cow bones? Forget it.

    Such motors are commonly used in battery powered hand drills but they use a reduction gearbox to get decent torque. If you plan to use the motor 'as is' it will stall very easily.

    Get hold of a scrap battery drill and use a mains power pack or car battery with it instead.
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