On Thursday 18 July 2019 19:59:41 Nicklas Karlsson wrote:
> On Thu, 18 Jul 2019 23:07:08 +0100
>
> andy pugh wrote:
> > On Thu, 18 Jul 2019 at 22:01, Nicklas Karlsson
> >
> >
> > wrote:
> > > It seems by no suprise writing real time to data to file within
> > > real time task have a negative imp
On Thu, 18 Jul 2019 23:07:08 +0100
andy pugh wrote:
> On Thu, 18 Jul 2019 at 22:01, Nicklas Karlsson
> wrote:
>
> > It seems by no suprise writing real time to data to file within real time
> > task have a negative impact on likelihood of real time delay.
> >
>
> With RTAI and kernel modules I
I did that too. I printed a 200mm diameter disk with 72 black white pairs,
read with a P5587 Photoreflector. It currently only reads speed, but I'm about
to replace the sensor to give quadrature output, so I can gear hob, as Andy has
shown.
-Original Message-
From: John Dammeyer [ma
On Thu, 18 Jul 2019 at 22:01, Nicklas Karlsson
wrote:
> It seems by no suprise writing real time to data to file within real time
> task have a negative impact on likelihood of real time delay.
>
With RTAI and kernel modules I don't think that is is even possible.
I tried non blocking fcntl(...
It seems by no suprise writing real time to data to file within real time task
have a negative impact on likelihood of real time delay.
I tried non blocking fcntl(...) function and O_NONBLOCK flag without success.
Adding some kind of buffer in for example shared memory between written by real
t
On 07/17/2019 08:56 PM, John Dammeyer wrote:
Thanks Jon,
I have lots of room under the pulley to mount something. Steel disk with slots and a hall sensor would easily do it. It's what I was going to do for simple RPM sensing into the Shumatch DRO with the reflective tape. Another project th
>
> The requirements for rigid tapping are less stringent than for PID spindle
> speed control. My 50-tooth one was entirely adequate for gear-hobbing.
>
> Another option would be to use a single index from the spindle and use the
> motor encoder for the A and B phases.
> Though you will need a
On Thursday 18 July 2019 05:57:28 andy pugh wrote:
> On Thu, 18 Jul 2019 at 03:01, Gene Heskett
> wrote:
>
> I have a G0704 John, and have not managed to damage those plastic
> gears
>
> > yet, but I found a 67 slot wheel replacing the original drilled tach
> > wheel, with slot interruptors had w
On Thu, 18 Jul 2019 at 03:01, Gene Heskett wrote:
I have a G0704 John, and have not managed to damage those plastic gears
> yet, but I found a 67 slot wheel replacing the original drilled tach
> wheel, with slot interruptors had way too much quantization noise to be
> used as spindle speed feedba
On Thursday 18 July 2019 00:29:50 John Dammeyer wrote:
> > IMO the docs for howto are lacking, but think in terms of a velocity
> > loop, where position is not the target, but velocity is. PID's can
> > handle that nicely but the howto docs aren't as clear as they should
> > be.
> >
> > > https://
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