[sdiy] Semi OT: Very high repeatability (accuracy) switches?

[cheater cheater]

Yeah. Use a laser beam. If you're cheap, you might be able to use one
of those laser pointer things.

D.

On Thu, Oct 22, 2009 at 1:28 PM, Jerry Gray-Eskue <jerryge at cableone.net> wrote:
>
> One of the most commonly used devices is an Opto switch. These have a slot
> that a metal tab on the moving piece enters to interrupt the light beam. You
> have an inherent accuracy of about +- the travel of one step, the smaller
> the step the more accuracy you can "Home". For the best accuracy find home,
> back out just a little and move back in Slowly so you have a minimum of
> overshoot. If you can micro step you can be more accurate about your home
> position but have to use micro stepping to carry the accuracy when seeking a
> location.
>
> - Jerry
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Julian
> Sent: Thursday, October 22, 2009 7:08 AM
> To: synthdiy DIY
> Subject: [sdiy] Semi OT: Very high repeatability (accuracy) switches?
>
>
> A little OT, but im looking for a switch that has very high repeatability
> for my CNC machine, to assist in calibration.
>
> As the origin is set using these switches, i need them to be very accurate
> as to the ammount of travel before switching.
>
> (of course, very accurate is relative, but more accurate than general every
> day switches!)
>
> They also need to be quite tough as well, if im not to have to protect them
> loads.
>
> Anyone got any ideas?
>
> Julian
>
> discalimer: i made the cnc machine, but do engrave for other people - if
> that's not diy enough for you, please forgive me : )
>
> http://www.thebeast.co.uk/cnc/
>
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