So, actually, servos with >1 million counts per rev are not that uncommon. They are now standard. Example: the mr-j4's on my CNC machine have 22 bit encoders (

So, actually, servos with >1 million counts per rev are not that uncommon. They are now standard. Example: the mr-j4's on my CNC machine have 22 bit encoders (4 million counts per rev) and are 4+ years old at this point. These are fairly standard equipment, and not that expensive as servos go (300 a motor, 300 a servo drive, in bulk). It will happily position repeatedly at to any of those counts, and it's repeatable to better than 5 microns (i am only using equipment good to about 5 microns because that's what i need. I have no urge to go set up the laser interferometer to measure this better, but i have no doubt it is repeatable to better) Yasakawa's sigma7 series are 24 bit encoders (so 16 million count per rev). Basically current generation servos are easily in the millions per rev count. (and since the robot are in turn made from these servos, ...) To be fair to haddington: this is a pretty wild leap from the last generation of servos in most cases. For comparison, the melservo-j3 was only an 18 bit encoder (262,114 count per rev), and the yasakawa sigma 5's were 20 bit (1 million count per rev) So each got better by a factor of 16 in the newest generation