Re: [CAD_CAM_EDM_DRO] Rotary Axis home and/or limit switches

It is often done with an encoder with an index pulse. This looks like a
standard quadrature optical encoder with an extra pin, which corresponds to
a single tick per revolution.

On Fri, Feb 5, 2010 at 09:27, ya_nvr_no <yanvrno@...> wrote:

>
>
> I have added a couple of rotary axis's But am having an issue with coming
> up with a good way to home them. One switch gives me a home position but if
> I rotate one revolution the switch is made again. I am using CNCpro, it uses
> a limit switch as the home switch.(would another program handle this
> better?)
>
> So for example, an issue on the B & C axis.
> Do I home at somewhere >90 degrees then move the B axis to the vertical
> position once I know what that angle is? Manual Zero this location.
> Home the C axis and then rotate it ~180 to find the center of the truncated
> 360 degree rotation? Manual Zero this location
> And on an A table axis I would be limited to less than 360 degrees.
>
> My options are:
> Using a M code or manual toggle switch to disable the homing/limit switches
> after homing
> or
> Using both home and limit switches, create a logic IC circuit/or PLC that
> determines conditions.
>
> I've searched but find no info on how this is handled.
> There has to be a straight forward way to handle this.
> Thanks for any HELP/Direction
>
>
>


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