RE: Subject: Why not linear feedback, instead of rotary encoders?
Posted by
Stephan Kotzé
on 2003-08-12 23:03:37 UTC
Shane
It is in fact done on high end systems, we are using the "cheap seats" options. Bosch Rexroth / Star has a system where they can integrate the linear position encoder (relative + absolute) into the actual linear rail and carriage, therefore completely eliminating Abbé error. Max resolution is 0.25 micron (that is millionths of a meter for the non SI countries :)), but at this resolution yout max speed in limited to 1m/s, obviously choosing a courser resolution allows more speed.
Stephan
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It is in fact done on high end systems, we are using the "cheap seats" options. Bosch Rexroth / Star has a system where they can integrate the linear position encoder (relative + absolute) into the actual linear rail and carriage, therefore completely eliminating Abbé error. Max resolution is 0.25 micron (that is millionths of a meter for the non SI countries :)), but at this resolution yout max speed in limited to 1m/s, obviously choosing a courser resolution allows more speed.
Stephan
---
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Checked by AVG anti-virus system (http://www.grisoft.com).
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Discussion Thread
Stephan Kotzé
2003-08-12 23:03:37 UTC
RE: Subject: Why not linear feedback, instead of rotary encoders?