Re: I want to upgrade to servors

Just to let you know that my motors are not mounted on sherline yet..
the voltage is 15v and 2 amperes.. those motors are 4 wires bipolar
stepper.. they are 1.8 degree , 4voltage and 2am ...

--- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:
> Hello,
>
> No, these(at the link) are not pancake style motors. In fact, they
> appear to be the newer hybrid "square" style with even better
magnets
> than the older "round" style hybrid type.
>
> So let's look into the other questions I asked?
>
> Ballendo
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "luisguillermo98"
<luisguillermo98@y...>
> wrote:
> > No; I do not think they are pancake.. the ones I have are 1.8
> degrees
> > 4 leads .. the model are lh2331-m200 and can be found at
> > http://www.eadmotors.com/pdf/RotarySize23HTTable.pdf
> > Let me know if they are the pancake..
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:
> > > Luis,
> > >
> > > What you are calling "locking up" is usually called "stalling".
> > This
> > > happens when the rotor in the motor gets out of sync with the
> > > incoming pulse train. There are a number of reasons that this
can
> > > happen...
> > >
> > > Are your motors the "pancake" style with 15 degrees per step?
> These
> > > look like they are made out of stamped sheetmetal, and are
bigger
> > > around (diameter) than they are long/tall?
> > >
> > > It has been awhile since I looked at Eastern Air's catalog, but
> > they
> > > used to "specialise" in this type motor. This pancake type is
not
> > > generally a good match for a Sherline type setup...
> > >
> > > Alternatively, the "hybrid" type motors have a machined face
and
> > > generally look to be higher quality construction compared to
the
> > > pancake type. They usually have a die cast and machined
> faceplate,
> > > with a 1.500 inch "locating" boss inside the 4 bolt holes(23
size
> > > motor).
> > >
> > > Anyway, there are two possible problems if you have these
pancake
> > > motors. One is that the rotor moves a large amount each step,
> which
> > > takes time. This will tend to make these motors slower overall,
> IME.
> > > Second is the concept of "matching" the motor to the load. We
> often
> > > get away with less than ideal choices here, but the sherline
> setup
> > > can lead to problems.
> > > The leadscrew of a sherline has very little mass, and the 15
> degree
> > > motor will have more "ringing"(overshoot and settling to the
> > > magnetically correct position) than a 1.8 degree motor, since
the
> > > rotor is moving farther with each step. Add these two factors
> > > together, and you WILL have the type of problems you are
> > experiencing.
> > >
> > > Now while I have assumed that you do have the pancake motors,
the
> > > problem can also be seen with the hybrid type motors, when used
> > with
> > > a sherline. If you have a double shaft motor, try "gripping" it
> > > lightly to add some "drag" (damping) to its movement. If this
> > > improves your situation, you can add friction to the system a
few
> > > ways. Tighten up the backlash nut adjustment. Add grease to the
> > > leadscrew liberally. Adjust the plastic gibs on the axes for
> > > a "tighter" fit. REDUCE the current to the motor (you may
> be "over-
> > > driving your setup. Are these 6 wire motors? Are you using
> > the "full"
> > > coil? If so, your amperage is set too high. Try switching the
> motor
> > > connections to 1/2 coil).
> > >
> > > Finally, there are devices sold for steppers to "damp" the
> output.
> > > One type is called a Lanchester dampener. These have a metal
disk
> > > spinning inside of a fluid filled plastic housing.
> > >
> > > If any of my assumptions are correct, you will have more
problems
> > > when the motor is alternating direction, than if it is driving
> one
> > > direction only.
> > >
> > > Lastly, what is your power supply voltage and amperage?
> > >
> > > Hope this helps.
> > >
> > > Ballendo
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "luisguillermo98"
> > <luisguillermo98@y...>
> > > wrote:
> > > > I have camtronic controller and its deliver 2amp which is
the
> > same
> > > > current as the motor.. so I do not understand why they run
too
> > > slow..
> > > > if you try to run them faster the axis of the stepper will
not
> > > move,
> > > > I think that is what people called "LOCKING UP"..
> > > >
> > > >