# Which Spindle Encoder

01 Nov 2020 04:44 #187985
I'm trying to determine which is the best spindle encoder to use.

I already have an Omron E6B2-CWZ1X @2000 P/R. The documentation for which, shows a maximum response frequency of 100kHz.

I am using a Mesa 7i76e connected to a Raspberry Pi 4 with LinuxCNC installed following John Thornton's instructions.

I'm hoping for a maximum spindle speed 2400 rpm.

For example, based on 2400 rpm, and what I have gathered from other threads here: 40 rpm x 8000 ppr = 320kHz.

Do I assume a quadrature count per revolution when using this equation?
If so, at a max frequency response rating of 100kHz, does that mean that the encoder can't keep up?
Are there other bottlenecks that I need to watch out for?

Thanks for helping me out.

-Loren

01 Nov 2020 04:57 #187987
Replied by BeagleBrainz on topic Which Spindle Encoder
According to the data sheet
3. The maximum electrical response speed is determined by the resolution and maximum response frequency as follows:
Maximum electrical response speed (rpm) = (Max Response Frequency / Resolution) x 60

This is found at the bottom of page 2:

Hopefully this is the correct data sheet:
www.farnell.com/datasheets/2693580.pdf
The following user(s) said Thank You: BlueChicago

01 Nov 2020 05:18 #187990
Replied by BlueChicago on topic Which Spindle Encoder

According to the data sheet
3. The maximum electrical response speed is determined by the resolution and maximum response frequency as follows:
Maximum electrical response speed (rpm) = (Max Response Frequency / Resolution) x 60

This is found at the bottom of page 2:

Hopefully this is the correct data sheet:
www.farnell.com/datasheets/2693580.pdf

(100,000 / 2000) * 60 = maximum 3000 rpm

I hope I have this right.

Thank you