RE: [CAD_CAM_EDM_DRO] DC motor as replacement for Stepper motor

hi! what we're trying to do is a customise lathe machine. we build it from
scratch. and it must have a computer interface. well it doesn't need to be
so complicated. What we had in mind is there is a round disk which holds
the blades then a sort of a piston from above the blade pushes it. so,
first we need a motor to rotate the blade and still keep track of its
movement which is possible if we use stepper. next we need a motor which
will facilitate to the movement of the piston and keep track of the pressure
exerted through the degree of the stepper, but the thing is if we use a
stepper at this piston it might push back so we were suggested to use dc
motor. honestly i don't know how we are going to build this in 3 weeks
time. were running out of fund and we don't know what really is best to
use. and it happened that we are trapped in a 3rd world country where in
ideas like this are put into waste. i mean imagine this project you would
even say that this sounds crazy since there are already lots of computerized
lathe machine that is available. but this is just important to us since
we're really behind in terms of technical stuff when we are studying. we're
more of a theory based.

anyway, hope anyone could help us out. thanks!

-----Original Message-----
From: Alan Marconett KM6VV [mailto:KM6VV@...]
Sent: Wednesday, January 23, 2002 3:17 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] DC motor as replacement for Stepper motor


Hi Chris,

I think they want to use a DC motor as a STEPPER, not a servo. And if
they are running out of funds to buy a stepper, then they are unlikely
to want to buy a G340 driver.

Hi Ramel,

Why not check out the surplus sources on the web for steppers? What are
your needs? What are you building?

Perhaps a few donations are in order? How about it guys? What's the
postage to the Philippines?

Alan KM6VV


ccs@... wrote:

>
> > hi to all! just want to ask if it is possible that we can use DC and
> > create a ckt board for it so it can act as stepper motor? if possible
> > where can i find resources on this.
> >
>
> Ramel,
>
> Yes, an appropriately chosen DC motor equipped with a rotary encoder
> for position feedback can be used as a servo motor. And there are
> servo drives (such as the G320/G340 from Geckodrive, whose designer is
> on the list here) which take the same step & direction inputs as
> stepper motors. Done right, this can results in much higher
> performance for much lower cost than that of the large stepper
> motors needed for substantial machine tools.
>
> Chris Stratton

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