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

Hi, for the money micro switches are relatively sealed from dust, and fair
repeaters. Optical and Hall sensors have several problems one they collect
dust and swarf,,,many inexpensive ones have hysteresis.. and or sensitive to
ambient light conditions. In a printing company i worked for we ended up
using good ole microswitch on a cam but we did use hall sensors to tell us
the camswitch was comming. Alittle piece of junk between the vane and a hall
switch and its smashed.. Despite the claims of the maker microswitches last,
last and last far beyond the count/failure ratings given by the mfg. cul
brian f.

----- Original Message -----
From: "Erik Reikes" <ereikes@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, September 30, 2002 7:18 PM
Subject: [CAD_CAM_EDM_DRO] Home/Limit switches : Micro switches or optical
interrupters?


> I am slowly but surely progressing on my servo CNC conversion and I
> have come to the question of limit switches.
>
> Are most people using micro switches or optical interrupters to
> determine their home position? What kind of repeatability in home
> position is required/attainable?
>
> Micro switches seem like they would be easier to implement while
> optical interrupter probably have greater accuracy and no moving
> parts. Right now I am leaning towards optical interruptors with a
> small tang mounted on my table to trigger the interrupter, but
> thought the list might have some thoughts on why microswitches are
> the greatest thing since sliced bread.
>
> TIA
>
> -Erik Reikes
>
>
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