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  1. #1
    Hi Everyone

    My Name Tony and I in live in Tunbridge Wells, Kent. I am a complete novice when it comes to cnc and hope to learn a great deal here. I begining to build my first cnc machine. I have built this driver circuit -

    http://www.instructables.com/id/Easy...=40&offset=480

    and have succesfuly got it working, now to build the machine!

    I am a keen craftsman and excited about learning new skills. I work in a theatre where I make Jewellery and Headresses for opera and ballet.

    Looking forward to this cnc thing

    Cheers
    Tony

  2. #2
    Hi welcome to the site, your membership has been accepted.

    Regards,
    Lee
    .Me

  3. Hi Tony and welcome.

    Dont wish to dampen your enthusiasm but have you got any thoughts about the size/capability of the machine you are going to build? The unipolar drivers you mention are fine for a very small machine, maybe thats what you want for jewellery, but will quickly run out of capability for anything larger...

  4. #4
    Quote Originally Posted by irving2008 View Post
    Hi Tony and welcome.

    Dont wish to dampen your enthusiasm but have you got any thoughts about the size/capability of the machine you are going to build? The unipolar drivers you mention are fine for a very small machine, maybe thats what you want for jewellery, but will quickly run out of capability for anything larger...
    Thanks fo the welcome

    I have been reading though the forum and am beginning to realise that i may be going down the many roads that lead to dead ends that many others and stumbled upon. Ok thankfully I have not as yet built the machine so can start smaller. Here is what i intended to build :-

    Mill for Wood and aluminum

    X axis = 600mm
    y axis = 600mm
    z axis = 300mm

    I have bought these motors Astrosyn MY103H702 (they are in the post I hope). I read you have a set and were going to test them, did you get round to it? I was going to post a question about them on the original thread. I need to figure out the power supply for them, can you help?

    so that is the basic outline. My hobby budget is very limited and I am happy to change my plans just get my teeth into cnc.

    Too big an idea for my driver? could you suggest axis dimensions?

    Thanks for your interest and knowledge

    Tony

  5. #5
    Welcome Tony.

    Have you got these axis lengths right? Y is a bit on the high side?

    X axis = 600mm
    y axis = 600mm
    z axis = 300mm

  6. #6
    Quote Originally Posted by GeorgeD View Post
    Welcome Tony.

    Have you got these axis lengths right? Y is a bit on the high side?

    X axis = 600mm
    y axis = 600mm
    z axis = 300mm
    Did you mean my Z axis. I know it seems high, I just thought i would like to carve tallish things one day :)

  7. Tony,

    The Astrosyn steppers are OK and fine for a small router for wood, pcb, plastic but you might struggle with aluminium. You won't get more than 0.8Nm and 300rpm out of them on a unipolar driver. The size you have suggested is possible, will depend on the design. The power supply will depend on your driver... but you probably dont want to go above 12v. Depends on the current limit resistor (light bulb) you've used...

  8. #8
    Few! thanks Irving thats a relief.

    I'm thinking of using a reclaimed PC power supply so 12V with a possible 3A should be ok. I need to work out the current limit resistor (light bulb) combintation with a bit of testing when the motors get here.

  9. well those steppers need 1A/phase so a 3A supply will be fine. The motors are 6.2v so need a 5.8ohm resistance on 12v, which is 5.8W so try a 6V 6W motorcycle tail/side light bulb to start, this will limit current to about 0.9A. A pair of 12V 15W bulbs in parallel will increase the current to about 1.2A, on a 12v supply.

  10. The Following User Says Thank You to irving2008 For This Useful Post:


  11. #10
    Hi Tony

    You have to allow some leeway for two axis so if you want those figures?allow another 50 mm to each axis,ie...

    650 X axis
    350 Z axis

    This extra 50mm is end to end components and then will give a full 600//300 distance but still will be short due to the Y axis plate and spindle.
    So think on size before you constuct and think about what you want to cut when its up and running.

    The X axis could be longer in my view ie 450 at the very least.

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