RE: [CAD_CAM_EDM_DRO] Spindle RPM control

How about this for spindle speed control:

...
M01 ; Set the spindle to 600 RPM
...

Regards,
JJ

Be Kind, Be Careful, Be Yourself

> -----Original Message-----
> From: Peter [mailto:prenolds@...]
> Sent: Saturday, September 28, 2002 7:47 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Spindle RPM control
>
>
> Guys, I know this is an idea exchange and that's fine, but
> controlling
> speed via an axis o/p seems to be getting awfully complicated to
> implement both in hardware and software (g-code). I for one
> really like
> the KIRSS principle (keep it "relatively" simple...).
>
> I have a Hitatchi SJ100 VFD on my BP clone - I've found that
> for 99% of
> my routine metal munching, I only use two speeds out of my VFD: fast
> (for a BP spindle) at 4800RPM and moderate, around 2500RPM.
> I just use
> one output line from my flashcut controller to select speed
> and another
> to select on or off. Then I programmed the VFD to watch two of its 5
> input lines accordingly. In my flashcut config, I created
> two M codes
> (I arbitrarily chose M50 for low speed and M51 for high
> speed) which my
> CAM software can also generate, based on programmed speed.
> Later I may
> assign another i/o line and M52 & M53 to get a total of 4
> programmable
> speeds - if the need arises.
>
> Question: Has anyone fitted external braking resistors to an
> SJ100 VFD?
> I find that I can turn the spindle faster than 4800RPM but
> above 4800,
> I get E07 errors due to overvoltage generation when decellerating the
> spindle motor. i.e. I need to brake the motor faster - to
> prevent the
> error.
>
> Cheers, Peter
>
> Dave Lantz wrote:
>
> >im thinking im missing something... aren't most hobby cnc
> retro's using some
> >form of step'n'direction signal? from a parport? is there an existing
> >circuit to control the vfd from step/direction?--dave l.
> >
> >-----Original Message-----
> >From: Jerry Kimberlin [mailto:kimberln@...]
> >Sent: Friday, September 27, 2002 1:27 PM
> >To: CAD_CAM_EDM_DRO@yahoogroups.com
> >Subject: Re: [CAD_CAM_EDM_DRO] Spindle RPM control
> >
> >
> >Dave Lantz wrote:
> >
> >>if someone where to make some of these, i, for one would be
> interested in
> >>purchasing! if i understand it right, it would be like a
> gecko 3XX for a
> >>spindle, right? (but controlling rpm instead of position)--dave l.
> >>
> >
> >Plenty of them out there already. If you have a 3 phase motor
> >running 220v, you can just use a VFD. These things can be
> >totally computer controlled as to speed, speed-up rate, slow-down
> >rate, forward, reverse, etc. You really need a 3 phase motor to
> >adequately adjust speed anyway, so I don't see why some VFD like
> >a Hitachi SJ100 couldn't be used.
> >
> >Maybe using a VFD has already been discounted by those who know
> >better. I don't know better as yet.... :-).
> >
> >JerryK
> >
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> >OFF Topic POSTS: General Machining
> >If you wish to post on unlimited OT subjects goto:
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> to reach it if you have trouble.
> >http://www.metalworking.com/news_servers.html
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> >http://groups.yahoo.com/group/jobshophomeshop I consider
> this as a sister site to the CCED group, as many of the same
> members are there, for OT subjects, that are not allowed on
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> >NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
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> Addresses:
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> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> 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 as 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........

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