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

[Jerry Gray-Eskue]

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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