RE: [CAD_CAM_EDM_DRO] stepper driver help

H Stefan,

The National Semiconductor device LMD18245 is a Full Bridge Driver that
can work up to 55V and 3 Amps. Two of them make a decent 3 Amp
Micro-stepper driver. I've used these on the Electronic Lead Screw for
the Z axis drive which on my Gingery lathe has a 270 oz-in motor.

I've also tested the driver donated to the ELS project from
www.ohmikron.com which uses these devices too. They supply a turn key
ready to go driver and parallel port interface. A friend is also using
them for an XYZ Router Platform.

I've built up the kits from www.embeddedtronics.com which also uses the
same drivers. I have three of those on an XYZ pick and place system.

Finally, Aaron at http://www.bright.net/~agarb/STMD/AVR_STMD.html is
donating an AVR based micro stepper driver to the ELS project. It
should arrive in a few days and I'll test it out with the ELS too.
Judging by the WEB site presentation this also looks like a nice product
and it has built in opto-isolation. And like the embeddedtronics.com
product, a bare board and programmed microcontroller are available if
you like to assemble things yourself.

Above 3 amps AFAIK the only inexpensive drivers are from GECKO. It's
only a matter of time before someone uses a dsPIC to drive 8 FETs to
make a 7A at 80V competitive product priced at bare circuit board and
processor for under $20.

John Dammeyer


Automation Artisans Inc.
http://www.autoartisans.com
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of stefan_sharpe
> Sent: Wednesday, September 26, 2007 6:07 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] stepper driver help
>
>
> My conversion project is going pretty slow right now- I am searching
> around on the net reading everything I can, to learn about what I am
> doing. Educated types might even call what I am doing reasearch...
> not sure if it is though as it is pretty fun so far :>
>
> Anyway, I had a lot of really good advice when I first posted- I
> hope I did not offend any of you with repeditive questions!
>
> I have also been hunting high and low for a bipolar stepper driver
> circuit that will go more than 2A, but they seem to be rare devils!
>
> I have found two 2A bipolar drivers and I keep wondering what the
> restrictions will be if i use them with Nema23 size motors. I know
> this is a difficult question to answer, but can anyone give me a bit
> of insight here?
>
> Thanks,
> Stefan
>
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@..., timg@...
> Moderator: pentam@... indigo_red@...
> davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider
> this to be a sister site to the CCED group, as many of the
> same members are there, for OT subjects, that are not allowed
> on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>