RE: [CAD_CAM_EDM_DRO] Re: Stepper motor speeds

I have an L297/L298 setup with 5.4V, 1.5A, 23 frame motors (a) driving
threaded rod lead screws. Power supply is 34V, 10A. on my X axis I can
do 75ipm, it's a 3/8-16 rod, so 75x16=1200rpm. I'm driving it with
TurboCNC, and for 75ipm it outputs 8000hz. Of course my sense of
fly-apartedness kicks in at about 50-60ipm, so I've slowed it down for
everyday use. I'm sure the smooth pulse train from TurboCNC helps the
performance at this speed.

Running the motors unipolar at 12v (through resistors), X maxed out at
9ipm or so, 144rpm. Needless to say I'm pleased with my new drivers.

Incidentally, I used the machine to mill it's own driver boards. I think
that's cool. Photos in the JJ folder of the group.

Regards,
JJ

Be Kind, Be Careful, Be Yourself

(a)
http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/Jameco/searchResult.d
2w/report?sort=BKW&search=206025 I know the website says 12v, but it's
wrong, I also don't think they produce 20000g-cm of torque, but have no
way to measure it. Also note that the shafts are 0.184". I'm still happy
with them.

> -----Original Message-----
> From: Bryan Mumford [mailto:yahoo@...]
> Sent: Sunday, November 03, 2002 6:44 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Stepper motor speeds
>
>
> At 4:26 PM +0000 11-03-02, turbulatordude wrote:
> >Size 42, 300 to 600 RPM, 800 in-oz or more low-speed torque.
> >Size 34, 600 to 1,200 RPM, 150 to 450 in-oz low-speed torque.
> >Size 23, 1,200 to 2,400 RPM, 50 to 150 in-oz low-speed torque.
> >Size 17, 2,400 to 4,800 RPM, less than 50 in-oz torque.
>
> This seems too fast to me. Perhaps you would comment on this. Looking
> at a 23 frame motor, in half step mode (400 steps per rotation), 1200
> RPM means 480,000 steps per minute or 8,000 steps per second. I am
> currently experimenting with 23 frame motors on Sherline tools using
> both the Xylotex bipolar driver and a unipolar driver of my own
> design. I'm stalling out at 3300 steps per second tops. It seems
> unlikely that this tool will ever run twice as fast as I'm seeing,
> and you list 1200 RPS as the low end.
>
> I'm feeding both drivers with 24 volts.
>
> What am I missing?
>
> --
>
> Bryan Mumford
> Santa Barbara, California
> http://www.bmumford.com
>
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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.

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bill
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