Re: [CAD_CAM_EDM_DRO] Re: Allegro 3977SED questions

The HobbyCNC (www.hobbycnc.com ) system is going to be tough to beat. I bought one of the 4 axis systems, had it assembled and running in a few hours. It's a very nice unit with resolution/microstepping as fine as 3200 steps per motor rev. Chopper circuit. The Nema 23 motors I got with it seem very good quality also. Very powerful for their size. I even added encoders and made it a closed loop system with Mach3. No lost position.

I sell the encoder board that makes this possible:

www.rogersmachine.net

Ron

lomcevaktumble <lomcevaktumble@...> wrote:
Vlad -
At the moment the plans are to build a cheap-o 4 axis foam cutter.
I'm looking at motors in the 60 - 120 oz.in. range. Fortunately not
too power hungry! I want to do everything as inexpensively as
possible just to see if I can do it! If everything goes well and I
feel confident I'll probably move on to something much more
powerful! I'm not above converting everything I own into a CNC based
machine!!!! And a mill would be super fun! Theoretically- with
enough CNC equipment- I'd never have to go shopping again. I'll just
make everything in my garage!
Your ebaying Kung-Fu skills must be much better than mine, I've
never been able to find any steppers that I liked. They're usually
some mixed lot of one decent one and 3 that look like something left
over from the cuban missile crisis. I've resorted to new motor
shopping from automation direct...the prices aren't too bad for new
equipment.
I do value your input...because it lets me know the limitations of
what I'm doing. I now know that I'm not going to be doing much
beyond foam cutting with this driver!

Happy Holidays

Michael


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Vlad Krupin
wrote:

>
> Sorry, I must've misunderstood what you were trying to acheive. If

you are

> looking for something that can be put together quickly and drive a
> 1.7-2.0Amotor at 20-30 volts, then 3977 is a great choice. Simple
> board design, few
> external components - it is great. I tried it, and I liked it in

general. I

> just had a hard time finding stepper motors that did not want 4-

5A... And

> much higher voltage... Maybe my ebaying kung-fu skills are

subpar :) So,

> that started me down the road to designing something that could

drive the

> motors that I bought, and the experience was just as much fun as

converting

> the mill to CNC in the first place. Since I am no electronics

expert either,

> it did take a looong time (still learning). I thought you were

trying to do

> the same.
>
> Good luck on your project!
>
> Vlad
>
> On 12/22/05, lomcevaktumble wrote:
> >
> > Vlad -
> > The 3977 seems to fit what I need it to do pretty well. The
> > steppers I'm looking at are in the 1.7 - 2.0 Amp range. The

machine

> > I'll be building won't need very heavy stepper motors.
> > I picked the 3977 because it was recommended and its seems pretty
> > simple. I'm not an expert with electronics and I need something

that

> > can be slapped together by me. I also need something fairly

quickly.

> > Do you have any recommendations for something that might fit

those

> > parameters? I'm always open to looking at something else. And of
> > course if I ever build a machine that needs more powerful motors
> > I'll have to leave the 3977 chip for something else.
> >
> > Thanks for all the tips and info everybody.
> >
> > Michael
> >
>
> --
> Vlad's shop
> http://www.krupin.net/serendipity/index.php?/categories/2-

metalworking

>
>
> [Non-text portions of this message have been removed]
>

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