Newsgroups: comp.robotics Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!ames!ads.com!pkahn From: pkahn@ADS.COM (Philip Kahn) Subject: What is the cheapest shaft encoder you know of? Message-ID: Sender: usenet@ads.com (USENET News) Organization: Advanced Decision Systems Date: Wed, 29 May 91 18:56:04 GMT Lines: 19 I have two axes that I am controlling with steppers. The steppers are to be operated open loop, but I need to have some home and limit switches. Thing is, they're a pain in the butt to mount, and it winds up not to be so very cheap when at least 4 are required. An easy way out of this is to find a really cheap, repeatable shaft encoder that effectively will provide me with "multiple limit" positions. I don't want to spend more than $10 per in quantity, they should slide over the shaft, and I don't need good resolution (obviously), though repeatability probably means it should be optical. HP makes some nice inexpensive encoders (that have great resolution), though the $25 per is too pricey. Any suggestions?? thanks, phil... P.S.: I don't think a pot and A/D has the repeatability I need, though I'm eager to be proven wrong :-)