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Thread: Removing a broken off tap
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30th Aug 2021, 07:14 PM #16Diamond Member
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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.
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30th Aug 2021, 11:13 PM #17
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.
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31st Aug 2021, 11:50 AM #18Diamond Member
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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.
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31st Aug 2021, 08:26 PM #19
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
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1st Sep 2021, 11:23 AM #20Most Valued Member
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This help?
https://www.instructables.com/Easy-t...and-Driver-ci/
Couldn't find anything on the EDM though
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1st Sep 2021, 11:35 AM #21Most Valued Member
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Here you go
A spark erosion apparatus - mikesworkshop
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1st Sep 2021, 02:22 PM #22Most Valued Member
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1st Sep 2021, 05:13 PM #23
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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