Re: I want to upgrade to servors

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"..
> >
> >