Re: uh, Mariss, can you clear up my confusion ?

Hi Mariss,

I was getting the math from your earlier post,
if I am correct, higher voltage will offer more
umph in the motor, I was thinking torque
as my main concern but did't get a chance to work
all the data out for speed and torque and
voltages.

I need to sit down and calculate the voltages
and wires sizes and power requirements
I will need to run 4 or 5 steppers, clamps
and little blinking lights on the project.

The one good thing about my current set-up is that
I can use that stepper/controller/software combination
on anything and even if I hit the wrong mouse click
I won't damage anything. (always looking at the bright side)

Thanks, you really brightened my day. I can use
most of what I have now.

And as I have said for years, allmost every porblem
goes away when you throw money at it.
(ie: good drivers and power supply)

Dave

--- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> Dave,
>
> Ok, The reason for your poor motor performance is you are running
it
> from a +5VDC supply. Actually it's amazing you are getting the
speed
> you report at that voltage.
>
> Step motor performance is proportional to voltage, and the maximum
> voltage is 20 to 25 times the motor's rated voltage.
>
> The good news is you can reasonably expect 20 times the speed you
are
> getting now. The bad news is you need a better (read more
expensive)
> drive that can do that.
>
> Your motor can deliver a lot more than it is doing now. It's the
> drive that's not up to the task. There is no reason to consider
> servos. The motors you have can do a lot more.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., "dave_ace_me" <davemucha@j...> wrote:
> > Where to start....
> >
> > I know I have been making a lot of mistakes so
> > understand I am near the bottom of the hole
> > in the pit under the ditch at the
> > bottom of the slope up the learning curve.
> >
> > I am using an e-bay stepper controller
> > uni-polar, running at 5 volts from a PC power supply.
> > (first mistake) (OK, first and second mistakes)
> >
> > I can run 300 steps/sec without a problem
> > and start to mis-step at 350 steps/sec.
> >
> > Since I am currently using a drill press
> > and just completing my lead screw mounting
> > I can only speak to the motor/controller.
> > (I's send a pic, but haven't figured out how
> > to post it in messages.)
> >
> > Drilling a 3/16 hole in 1/4 steel plate
> > will miss step if I try to take more than
> > 20 steps per peck into the metal.
> > 16 tooth XL drive pully 60 tooth driven.
> >
> > My real need is 3/64 in aluminum so
> > this is not a problem, just testing.
> >
> > The speed limitation is just from moving the
> > stepper on a bench, unloaded. I am more
> > than willing to accept it is a limitation
> > of the drive. PIC micro on the serial
> > com port connected driver board.
> >
> > regarding CPU, windoz 98 SE on a Compac 486-66
> > and also on an AMD 800.
> >
> > The Stepper is a VEXTA 2 Phase, 6 wire uni-polar
> > 5.4 volt 1.5 amp NEMA 23, does the same on both
> > my motors, one is a cube, about 2.5 inches long
> > the other is about 4.5 inches long.
> > The (longer) one I am using is a PY7 series.
> >
> > for proof of concept, I am getting ready to use
> > a 1/2-13 rod, but want to use a 10 TPI acme
> > once I get the bugs worked out. I assume a
> > 0.9 deg/step on 10 TPI will get me close to
> > a 0.001" positional accuracy. Theoretically
> > it comes out to about 0.0005 per step.
> >
> > One benefit I have is that my drive will not
> > be under any load as it will move the table
> > between drilling operations and not
> > any cutting operations.
> >
> > Do I anticipate the answer is getting a
> > 'real' stepper controller ?
> >
> > Dave
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...>
wrote:
> > > Dave,
> > >
> > > Good evening! I think you are mixing apples and oranges here.
It
> is
> > > coincidence my example speed and yours are similar. I was
> thinking
> > > about your problem when I read your original post but did not
> > address
> > > it because I needed more info. So here goes:
> > >
> > > (1) What is your leadscrew turns per inch?
> > > (2) What is your power supply voltage for the drives?
> > > (3) What type drives are you using? Full-Step? Bipolar?
> > > (4) What is the maximum speed you get before stalling?
> > > (5) Is the motor under load at the time?
> > > (6) What is your CPU speed?
> > > (7) What is your motor frame size? 6-wire? rated phase current?
> > > (8) What is your leadscrew diameter?
> > >
> > > I have a hunch the reason for your problem will be simple and
you
> > > will be able to get much more speed than now.
> > >
> > > Mariss
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "dave_ace_me" <davemucha@j...>
wrote:
> > > > from post: 39596 Subject: Re: Gecko G201
> > > >
> > > > <sinp> (1) A full step drive needs 200 pulses to
> > > > > turn 1 rev. A 10 uStep drive needs 2000.
> > > > > A full step drive needs 4,000 step pulses per
> > > > > second to turn a motor at 1,200 RPM, while
> > > > > the 10 uStep drive needs 40,000 for the
> > > > > same speed. Many cannot come up with the
> > > > > higher step pulse frequency. <big snip>
> > > >
> > > >
> > > > I was hoping I could get 4,000 steps per
> > > > second on a standard stepper, alas,
> > > > I knew that was too much to hope for.
> > > >
> > > > then <snip> > Maximum speed at 250 oz-in is
> > > > > 360 full steps per second. On a 10 TPI
> > > > > leadscrew this is an agonizingly slow 10.8 IPM.
> > > > >
> > > >
> > > > this is more in what I had experienced,
> > > > (actually 300 steps per second)
> > > >
> > > > Since I want to drive a 120 inch long lead screw,
> > > > am I screwed ? that is roughly 12 minutes for a
> > > > 10 ft travel. or if use a 0.9 deg per step,
> > > > that would double to just over 23 minutes.
> > > > now that is truly agonizing !
> > > >
> > > > what is a good solution ?
> > > >
> > > > How fast can you spin a servo ?
> > > >
> > > > Dave
> > > > (wishing the laws of physics didn't apply
> > > > to those of us in New Jersey)
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > > Mariss
> > > > >
> > > > > --- In CAD_CAM_EDM_DRO@y..., "rsgoldner" <rgoldner@i...>
> wrote:
> > > > > > Mariss, is this right? Given my three motors at 3V/4A
phase
> > > > driven
> > > > > > by G201s do I need about 60V at 10A or 60V at 2A? Big
> > > difference
> > > > in
> > > > > > cost!
> > > > > >