Re: Built first axis

How fast do I need to go ? That is the question, I've built
everything from scratch so I have nothing to compare to. Never even
been around a CNC machine, That's why I'm asking. The way I'm testing
is I wrote a program to toggle the printer port line and ran it into
my controller. Then I put a ruler down and timed it. Kept reducing
the delay in my program until I found the spot where the motor
wouldn't turn anymore. Then I went with that. The motor isn't running
out of torque because at top speed I put a 25 pound plate on it and
it didn't seem to have any problem with it, as far as I can tell it
wasn't missing steps, but can't verify at this point. I'm just
wondering if where I'm at is a usable speed and go ahead and build
the other 2 axis or if I need to rethink my design a little. I just
have a lovejoy coupler going from the motor to the acme rod and then
to a bracket with a nut on it. So I think that is considered direct
drive. Just trying to verify I'm not wasting my time is all.


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "starcast82"
> <starcast82@y...> wrote:
> > Using NEMA 23 124oz motors with a unipolar driver.
>
> if you are connect on a 1:1 mount, you can expect nema23 speeds of
> 1,200 to 2,400 RPM
>
> 12 tpi on a 200 spr motor is still 2,400 steps per inch, with a

Gecko

> 10x Microstepping drive, that makes it 24,000 steps per inch. at
> 24,000 hz, that is an inch a second or 60 inches a minute.
>
> how fast do you need to go ?
>
>
>
>
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> > <davemucha@j...> wrote:
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "starcast82"
> > > <starcast82@y...> wrote:
> > > > on my cnc and I am currently getting a top speed of around 14
> > > inches
> > > > per minute. I'm wondering if this is in the ballpark. I'm

using

> a
> > > > motor controller I designed and 12 threads per inch acme rod.
> > > >
> > > > Thanks
> > >
> > > More data needed. direct drive, motor type, gearing ratio,
> > > full/half/quarter step ?
> > >
> > > from this data, you should be able to figure out steps per inch.
> > > select motor from below and figure steps per minute
> > >
> > >
> > >
> > > taken from post on message 45509
> > >
> > > ...As a rule of thumb, steppers are pretty much out of torque
> > > (rapids) at:
> > >
> > > Size 42, 300 to 600 RPM, 800 in-oz or more low-speed torque.
> > > Size 34, 600 to 1,200 RPM, 150 to 450 in-oz low-speed torque.
> > > Size 23, 1,200 to 2,400 RPM, 50 to 150 in-oz low-speed torque.
> > > Size 17, 2,400 to 4,800 RPM, less than 50 in-oz torque.
> > >
> > > .....