Automatic bulletbsizer luber

Discussion in 'Handloading and Reloading' started by KY DAN, Jul 1, 2022.

  1. KY DAN

    KY DAN Member

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    I am starting the design process for this tool and I have everything figured out except for the gear motor to drive the unit. I am not an electrician nor do I have any experience with gears or gear motors.

    I would like to be able to size around 3000 bullets a hour. I am ok with the rate being less

    Can anyone recommend a motor to be able to push the bullets through the dies?
     
  2. tightgroup tiger

    tightgroup tiger Member

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    Your desired output would need a small gear motor with a final output of 50 rpms. I would think you would want a DC motor so you can variable speed the thing if 3000 is to fast. 3000rph /60minutes= 50 rpm assuming your using a rotating cam set to run your punch.
    An AC motor/Frequency inverter combo will loose it torque when you slow down below synchronous speed (Nomenclature Speed) and that wouldn't be desirable in this case.
    Right now I don't have any way to calculate how many inch/pounds of torque it takes to push a bullet through a sizing die because there are to many variables. I guess after the machine is designed, a person could use a inch/pound torque wrench with ratchet to turn a cam hooked to a plunger, to see how much torque it would take to push a bullet through a sizing die before ordering the motor/drive.
    You also have to figure out the running friction of the rest of the machine and add that on to get the full process torque.
    Once you know the torque needed the DC gear motor/drive, with a 50 rpm output, could be chosen.
     
    Last edited: Jul 2, 2022
  3. tightgroup tiger

    tightgroup tiger Member

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    How big of a machine is this going to be. Some lubri-sizers push pretty hard so you may be dealing with foot/pounds instead of inch/pounds of torque.
    Without seeing your design it's pretty hard to recommend anything other then just describing the process of finding your required torque.
    3000/hour is trucking along pretty fast.
     
  4. jmorris

    jmorris Member

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    60 seconds in a minute X 60 minutes in an hour = 3600 seconds in an hour. One cycle a second (60 rpm) gets you 3600/hr.







    There are a number of motors you cannot vary the speed of much, like that shaded pole motor running that Lee single stage. The other is very adjustable, being a 3ph gearmotor ran off 1ph power using a VFD.

    3ph gear motors can be a great bargain because many do not know how easy it is to implement them even if you don’t have 3 ph power. This gearmotor cost 4 digits new and I “won” it on eBay for $35 shipped (probably cost more to ship that that).



    DC motors are also quite adjustable without loosing a lot of torque but generally sell at higher prices.

     
    Rule3 likes this.
  5. Rule3

    Rule3 Member

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    Once again you never fail to amaze me with your skill on making cool stuff!:)

    A real Rube Goldberg!
     
  6. AJC1

    AJC1 Member

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    Your probably better served by a high torque servo that can run both directions at an infinitely adjustable speed. This could allow you to run a standard style press. If using a one way motor you will have to design a crank style assembly to allow full rotation and then a feeding device with timing to match your pass through speed.
     
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