but in at least one case that I know of, the resolver is geared to make one turn for the entire travel of the table. Therefore it can never lose position.
Even in 1964 with resolvers Cincinnati machines never lost position and didn't have batteries or hall-effect sensors or encoders or any of that shit. Analog is actually pretty cool.
at best they might be accurate to one part in 10,000 or .03 degrees for an individual resolver. i had fun with that stuff in the usmc on some ancient ea-6b antenna positioning systems.
anyhow if you want better than part in 10,000 you need another syncro geared at say a 10:1 ratio to the first one. the first one gives you the absolute position, the second one gets you the accuracy you need. the split gears, spring preloaded.. yes eventually those gears wear out! takes a long time though...
a 2024 line encoder is better than a synchro any day, and it dosen't really cost anything to add the 1024,512,256,128,64,32,16,8,4,2 rings to the same etch, to get an absolute encoder.
and that's only 13 bits, you could manually scribe those lines in with dividing head on a 1 foot diameter wheel.. adding the next 10 bits is the challenge.
RESOLUTE is a true absolute, fine pitch optical encoder system that has excellent dirt immunity, and an impressive specification that breaks new ground in position feedback. It is the world's first absolute encoder capable of 32-bit resolution at 36 000 rev/min.
try that with a geared resolver. lol!
