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  1. #16
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    Jun 2010
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    Quote Originally Posted by BaronJ View Post
    I've not built this but I don't see any reason why it should not work OK .
    That looks to be a unipolar stepper driver. Theses days a driver module for the more common bipolar steppers are crazy cheap to the point where you wouldn't bother making your own. Fore example a dual H-bridge L298N board is $7 off Ebay.

    Would be interested if you can dig up the power supply circuit though.

  2. #17
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    Sep 2012
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    York, North Yorkshire UK
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    Quote Originally Posted by RustyArc View Post
    That looks to be a unipolar stepper driver. Theses days a driver module for the more common bipolar steppers are crazy cheap to the point where you wouldn't bother making your own. Fore example a dual H-bridge L298N board is $7 off Ebay.

    Would be interested if you can dig up the power supply circuit though.
    Hi Russell,

    I'm getting a bit out of touch nowadays with steppers and such. Now you mentioning Lm297 and Lm298 chips !
    I have several kicking about but I've never used them. I didn't know what they were until you mentioned the number, so I looked up the data sheet.

    I also found some other info. Unfortunately Not from the same project, but the picture looks similar. As far as the power supply is concerned, it was a linear one fed from a transformer, about 4 amps I think. I actually bought a transformer for this project from a firm in Halifax. I'm fairly sure that I still have it somewhere. It quite big ! It stands about 7 or 8 inches high by about 5 inches square. I'll try and find it and take a picture of it.

    1039194.jpg

    This is the picture of one I found.
    The one that I was looking for had a stepper motor driving a screw, but similar in appearance.
    Best Regards:
    Baron J.

  3. #18
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    Jun 2010
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    Canberra
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    Quote Originally Posted by BaronJ View Post
    I'm getting a bit out of touch nowadays with steppers and such. Now you mentioning Lm297 and Lm298 chips !
    I've got tubes of both from my uni days, of which I used very few. The L298 is such a neat chip I was certain I'd find many uses for it.

    Turns out that when you actually look, there's quite a lot about DIY EDM, the simplest looking to use a linear PS and an R-C circuit to generate the sparks.

  4. #19
    Join Date
    Aug 2008
    Location
    Tennant Creek, Aust
    Age
    59
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    520

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    M&G have a 10 piece tap remover set for $20.00



    http://www.mag-pro.com.au/goods.php?id=422

    Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012

  5. #20
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    Jul 2010
    Location
    Melbourne
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    Quote Originally Posted by BaronJ View Post
    Hi Guys,

    Whilst trawling through my backup HDD's I found this picture which is I think part of the EDM drive circuit.
    This help?
    https://www.instructables.com/Easy-t...and-Driver-ci/

    Couldn't find anything on the EDM though

  6. #21
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  7. #22
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  8. #23
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    Sep 2012
    Location
    York, North Yorkshire UK
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    Hi Stuart,

    Brilliant detective work, yes those are some of the articles that I remember ! They have been somewhat updated though. Thankyou for finding them and the links. I've re-downloaded them so at least they are now current data.
    Best Regards:
    Baron J.

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