Re: [CAD_CAM_EDM_DRO] Re:Home Switches

Could be backlash in the axis. You can check it with a dial indicator.
Also look for chips/dust on the microswitch lever and whatever actuates
it. I can repeatedly home my home-made router and get variances of less
than 0.001". I use roller lever microswitches.

Regards,
JJ

On Saturday, January 10, 2004, at 11:15 PM, Dave Fisher wrote:

> On fitting home switches to our router table, I notice that each time
> I home the table - the X and Y readings differ greatly, some times
> upto + -
> 0.5 mm. Seldom never going to zero. Slowing the home traverse speed
> seems to
> make little difference.
>
> I would have expected there to be some differnces caused by backlash
> etc but
> not as much as I am getting.
>
> I have used good quality lever type micro switches, but wonder if I am
> suffering from switch bounce or just the mechanical properties of a
> micro
> switch. Would I be better using a slotted opto coupler to eliminate
> mechanical tolerences or any other method ?
>
> The table is being driven with Rutex Amps and The Desk CNC sofware and
> controller.
>
> Any advice would be appreciated
>
> Rgds to all
>
> Dave Fisher
>
>
>
>
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