Re: [Emc-developers] Spindle speed signal

2016-12-08 Thread Jon Elson 

On 12/08/2016 12:19 PM, andy pugh wrote:
> On 8 December 2016 at 18:10, Robert Ellenberg  wrote:
>> Does anyone use a spindle encoder with only position output? In other
>> words, encoder position linked to  motion.spindle-revs, but no input to
>> motion.spindle-speed-in?
> I would imagine that it might be uncommon, but not unknown. For
> example a serial encoder might not have velocity data.
>
First, I have to say I'm using some old LinuxCNC versions, 2.5.x and 
2.6.x, but I have no connection to

motion.spindle-speed-in

motion.spindle-revs is hooked up for threading.

Jon


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Re: [Emc-developers] Spindle speed signal

2016-12-08 Thread Chris Radek 
On Thu, Dec 08, 2016 at 06:10:09PM +, Robert Ellenberg wrote:
> Hi All,
> 
> Does anyone use a spindle encoder with only position output? In other
> words, encoder position linked to  motion.spindle-revs, but no input to
> motion.spindle-speed-in?

motion.spindle-speed-in IN FLOAT

Actual spindle speed feedback in revolutions per second;
used for G96 (constant surface speed) and G95 (feed per
revolution) modes.

Because important things don't work without it, I think all lathes
will have a signal here, whether it comes from an encoder (directly
or through a ddt) or it's just a loopback from the commanded spindle
speed (in the no spindle encoder case).

I'd go ahead and depend on it being there, if it solves a problem.
Maybe also add another note to the documentation here?


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Re: [Emc-developers] [Emc-users] Spindle speed signal

2016-12-08 Thread Peter C. Wallace 

On Thu, 8 Dec 2016, andy pugh wrote:


Date: Thu, 8 Dec 2016 18:19:53 +
From: andy pugh 
Reply-To: "Enhanced Machine Controller (EMC)"

To: EMC developers 
Cc: "Enhanced Machine Controller (EMC)" 
Subject: Re: [Emc-users] [Emc-developers] Spindle speed signal

On 8 December 2016 at 18:10, Robert Ellenberg  wrote:
Does anyone use a spindle encoder with only position output? In other
words, encoder position linked to  motion.spindle-revs, but no input to
motion.spindle-speed-in?

I would imagine that it might be uncommon, but not unknown. For
example a serial encoder might not have velocity data.


I think thats true with the HM2 SSI BISS and FANUC encoders

Not sure if its possible but you might consider doing something
like the PID component which detects if pid.N.feedback-deriv
is connected and calculates  a local  d/dt velocity if not



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Mesa Electronics

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Re: [Emc-developers] Spindle speed signal

2016-12-08 Thread andy pugh 
On 8 December 2016 at 18:10, Robert Ellenberg  wrote:
> Does anyone use a spindle encoder with only position output? In other
> words, encoder position linked to  motion.spindle-revs, but no input to
> motion.spindle-speed-in?

I would imagine that it might be uncommon, but not unknown. For
example a serial encoder might not have velocity data.

-- 
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, 1916

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