1. #1
    I'm building what is called the book machine and i'm now looking at the elctronic side of things. I saw this on ebay and wondered if this kit was any good, i will be cutting soft,hard woods.

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT


    Thanks Dean

  2. Sounds good for me.
    I'm using the same Breakout board and steppers in my CNC. Instead of PM542 drivers I have PM752, hence higher supply voltage.
    With my setup I'm able to mill steel, and I would try the same with your set. Eventually in case of loosing steps or motor stalling I would decreased Feed rate.
    But If you want to buy pieces separately I would recommend PM752 - http://www.slidesandballscrews.com/p...ml?cPath=44_97
    and some handsome 500W toroidal transformer (eg from Farnell- free delivery on orders above 20+VAT) + 25A rectifier bridge + big capacitor (voltage not smaller than DC after rectification).
    for reference:
    Click image for larger version. 

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  3. #3
    Quote Originally Posted by wiatroda View Post
    If you want to buy pieces separately I would recommend PM752 - http://www.slidesandballscrews.com/p...ml?cPath=44_97
    and some handsome 500W toroidal transformer (eg from Farnell- free delivery on orders above 20+VAT) + 25A rectifier bridge + big capacitor (voltage not smaller than DC after rectification).
    I agree with getting PM752. I have also got them and the extra voltage will help with your motors torque/rpm.

    I'm only using an 8A bridge rectifier, with 4 motors it's fine. Just get whatever's cheapest ...

    The following capacitor from farnell is good value:
    http://uk.farnell.com/epcos/b41231a9...0uf/dp/1839296
    (put two in parallel)

  4. Dear wiatroda , why you may use PM752 instead of PM542 . I think both are good options I have not found any problem in using PM 542 .

  5. #5
    Quote Originally Posted by CLAYTON View Post
    Dear wiatroda , why you may use PM752 instead of PM542 . I think both are good options I have not found any problem in using PM 542 .
    PM752 is 75 volts, versus 50 volts for the PM542. Motor top speed is roughly proportional to voltage, so 75 volts will allow the motors to run significantly faster - hence get PM752 if you can afford them!

  6. #6
    I've bought the same kit recently for 205. The seller is Zapp Automation. I think I got lucky as it was an auction price starting at 180 and not too many bids. Most (all?) his stuff is now listed as buy it now.

  7. Quote Originally Posted by CLAYTON View Post
    Dear wiatroda , why you may use PM752 instead of PM542 .
    Jonathan is right. more voltage = more torque at higher speed.
    Please google: stepper motor basics for some related articles or/and you can visit http://www.diycnc.co.uk/html/stepper_basics.html and other websites

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