"The solution is to either add more counts per revolution or use a ten
timesmore complex control algorithm."
IIUC then the real problem here is statistical. That is the sample size is too
small to be significant. Maybe an over-simplification of the issue but:
I think there are a couple of ways to approach this. (1) time stamp the
index pulse.
(2) use a high count encoder and scale as necessary. This
is clearly limited by the response of the optics for the disc.
100 - 200 KHz for the inexpensive stuff.
I don't think there is a one size fits all solution. In electronic terms
lathe spindles are pretty slow and have a lot of angular momentum. Most
lathe spindle
rpm range is not a lot over 5-6 binary bits.
I've actually considered putting a disc brake on the spindle. Not
exactly joking.
Just late evening rattling the cage.
Dave
Could you solve the noise issue with a phase-locked loop?
Yes, this would be a far better solution. But I didn't want to
re-write the encoder counter from scratch.
Ideally you would use two PLLs, one for the pulses and one for the
index, to predict the pulse gap and extrapolate through it.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
� George Fitch, Atlanta Constitution Newspaper, 1912
_______________________________________________Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
