If an encoder is being considered, this absolute encoder might be worth
a look:
http://www.avagotech.com/pages/en/motion_control_encoder_products/magnetic_encoders/aeat-6010/
 
(Short URL) http://alturl.com/aya7s 

I don't think the resolution is high enough for final tool position, but
certainly good enough for parking against a pawl. Being absolute, the
tool position is known even after rebooting.

Here is what I have on my site:
http://wallacecompany.com/machine_shop/EMC2/AEAT-6010/ 

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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