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

[ChristianH]

I wouldn't expect a laser pointer to be working reliably in continuous
operation. They are designed to be on for short periods of time, an most
probably aren't built more solid than is needed for that.

Ok, you DID say cheap :-)

Chris



On Thu, 22 Oct 2009 17:49:06 +0100 cheater cheater <cheater00 at gmail.com>
wrote:

> 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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