Re: [CAD_CAM_EDM_DRO] Home/Limit switches : Micro switches or optical interrupters?

Posted by CL

on 2002-10-01 06:08:37 UTC

Hey Jerry,
Your technique looks to solve the problem I mentioned !

Thanks
Chris L

Carol & Jerry Jankura wrote:

> The trick here is to mount the prox switch so that it is perpendicular to
> the motion rather than on axis. That way, when something goes wrong, the
> sensing flag will simply drive past the switch and not collide with it.
>
> Some tricks to making prox switches more repeatable is to
> 1. Always approach from the same direction for the final sense.
> 2. Allow the 'home' position to be when the flag just leaves the switch
> (switch turns off)
>
> |One thing I really remember with Prox switches was that when
> |things went "Wrong".. really wrong, and it can and does, Guess
> |what got pounded to death ? Yep, those more expensive limits ! The gap was
> |generally too small to allow space for a safe "Stop Zone" before
> |smashing the switch. (the ultimate situation leaves enough room
> |for "shock Absorber" dead stops on the machine)
>
> -- Jerry
>
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