Thread: Hobbymat MD65

  1. #1
    Hey guys.

    My lathe has helped me out lots in the past and has more than enough power and size for what I use it for.

    I decided I want to CNC it, Could anyone point me in the right direction please?

    The ball screw on the Axis is fairly self explanatory, however I am struggling on how to control the motor (especially for threading) and also the tail stock for center drilling and other operations.

    All advice is appreciated!

  2. #2
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    i know of someone close to you selling a starturn 4 on Mach3

  3. Quote Originally Posted by craigrobbo View Post
    Hey guys.

    My lathe has helped me out lots in the past and has more than enough power and size for what I use it for.

    I decided I want to CNC it, Could anyone point me in the right direction please?

    The ball screw on the Axis is fairly self explanatory, however I am struggling on how to control the motor (especially for threading) and also the tail stock for center drilling and other operations.

    All advice is appreciated!
    Here's a blog on the subject... Setup and CNC conversion of a Prazi MD65 or SD300 Lathe made in east germany 1988

    Generally the CNC applies to the leadscrew, cross-slide and maybe to spindle speed (nice to have but secondary to axis control). For threading you need an encoder on the spindle so that the control software knows how many revolutions have occured. Needs a fairly high resolution encoder though the software can interpolate by time. The same data can be used for spindle speed control feedback.

    You wouldnt CNC the tailstock as a rule (although it has been done). Centre drilling a part as a prep to CNC'ing it is generally a manual operation, and turning between centres for CNC is unusual (though again, seen it done). For actual drilling you would normally mount the drill in a collet on a tool changer, either a rotary one or a gang one on the cross-slide. Here's an example: http://www.youtube.com/watch?NR=1&v=9wbatJUciDY
    Last edited by irving2008; 27-08-2012 at 08:26 PM.

  4. #4
    Thanks for that, But its the money aspect, It would have to be incredibly cheap.

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