Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

[John Dammeyer]

> -----Original Message-----
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: May-08-20 9:21 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder
> 
> On 05/07/2020 06:33 PM, Dan Henderson wrote:
> > Thanks Gene! I can go down to 48 PPR on the encoder. If I do so, what is
> > the trade off for reducing resolution on my mill project? Is that enough to
> > successfully use rigid tapping and synchronized feed/speeds?
> >
> >
> 48 pulses is 192 quadrature counts/rev, so not too bad.
> Roughly 2 degrees.  I do tons of rigid tapping with 4-40
> taps using an 81-tooth gear as the encoder wheel on my
> Bridgeport.  It does just fine.
> 
> You do need to have the index pulse hooked up for rigid
> tapping, lathe threading, etc.
> 
> Jon

Hi Jon,
I suppose you are using external hardware to create motion and count encoder 
pulses?  
So BASE_PERIOD isn't even used? 
Or is it still needed for tapping?
 My understanding is the SERVO_PERIOD time is used to calculate the spindle 
velocity from the time between encoder pulses at the BASE_PERIOD.

John Dammeyer



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