Re: Is it possible to change the BP motor to eliminate shifting?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

> Keith Clark wrote:
>
> >Thanks Jon, I am installing a VFD and would like to figure out

how to

> >use pneumatic cylinders to shift. Do you know of this being done

on

> >the BP since the shift requires a 180 degree throw of the lever? I
> >think someone suggested using a stepper motor to turn the shift...
> >
> >
> I think an air cylinder with a restriction in the air lines is

perfect

> for this
> application. This is where you want a steady force applied until

the gears

> engage. You could always use aircraft cable over a grooved drum to
> effect a 180 degree movement of the lever. I think a stepper would
> have to have a spring or similar arrangement to keep from stalling

the

> stepper until the gears engage.
>
> Jon

Jon and Keith, If you take a look at the bucket on a backhoe, you can
see how the linkage allows a linear motion of the hydraulic cylinder
to affect a near 180 degree rotation of the bucket. It may be
substantially easier than cable and drums, etc. Just a thought.

Randy