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

[cheater cheater]

But you only need it on during calibration!

> Ok, you DID say cheap :-)

yup :)

D.

On Fri, Oct 23, 2009 at 9:47 AM, ChristianH <chris at chrismusic.de> wrote:
> 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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