Re: faster steppers

Hi Henrik,

The latest Eagle 4.1 (?) will read the board file just fine; do you
happen to have the schematic (.SCH) file also? I saw the .JPG file.

What I really wish Eagle would do is allow imports from Orcad or
.DXF's. I'm gonna check their download area again. I seem to recall a
"user" file area. Something there?

I also want to generate a Gcode file from the board layout. ONCE I
figure it out.

Thanks again for the files.

Alan KM6VV

Henrik Olsson wrote:

>
> Ian,
> I'm glad you are happy with the design. I don't have any experience with EMC
> but from what I hear on this list it can drive steppers pretty well. Maby
> you should just settle with the speed you get. However it's always fun to
> experiment a bit.
> Yeah, I know, it can be a bit of a pain to set the currents correct but I
> figured once it's done you don't change it very often so I didn't put more
> work in it - will do in the next version 'tho. Besides I wanted to hold the
> boardsize inside the freeware-version limit of Eagle.
>
> Looking forward to see those pictures! Good Luck.
>
> /Henrik Olsson.
>
> ----- Original Message -----
> > Hi Henrik,
> > Yes, I am using you design of driver boards and they seem to work very
> well.
> > I did have a bit of trouble trying to set up the currents with the trim
> > pots - it was a bit difficult to get a stable state ( Change the running
> > current and the idle current changes and vice versa ) but they all worked
> > first time and seem pretty rugged. When I get the machine finished I'll
> post
> > some pictures including the driver boards in their old computer case.
> > I haven't tried driving the steppers through a function generator as I
> > haven't got one. Before I hooked them up to the computer, I did a little
> > test of the boards and motors using a very basic 555 timer chip oscillator
> > to drive them but this didn't really tell me anything except that the
> boards
> > functioned OK. I have determined the maximum speed at the moment by trial
> > and error and altering the ini file in EMC. This is a bit of a learning
> > curve as I am working in metric unlike most others. However, I now have it
> > so that, on a G0 command, the motor will drive the axis smoothly and
> cleanly
> > as quickly as possible without stalling ( I actually got it up to about
> 570
> > r.p.m. but it wasn't rock solid and so I backed it off to 540 where it is
> > happier. Even though the motors are not too powerfull, I can't stop the
> > carriage with my hand at this speed so it should be OK.
> >
> > Ian
> > --
> > Ian W. Wright
> > Sheffield UK
> > www.iw63.freeserve.co.uk