On 9 February 2012 09:36, gene heskett ghesk...@wdtv.com wrote:
Or perhaps there is a re-triggerable one shot module?
http://www.linuxcnc.org/docview/html/man/man9/oneshot.9.html
Now this looks pretty good. I presume it could run at BASE_THREAD rate, or
is it servo thread only?
It is
On Thursday, February 09, 2012 05:34:14 AM andy pugh did opine:
On 9 February 2012 09:36, gene heskett ghesk...@wdtv.com wrote:
Or perhaps there is a re-triggerable one shot module?
http://www.linuxcnc.org/docview/html/man/man9/oneshot.9.html
Now this looks pretty good. I presume it
On Thu, Feb 09, 2012 at 11:23:47AM +0200, andy pugh wrote:
It is servo-thread only as it uses floating-point. I am not entirely sure why.
Aha, that's why I added the laser-thread in my HAL: A base-period thread
with FP allowed. On a modern CPU it's no big deal.
--
Ben Jackson AD7GD
On Thursday, February 09, 2012 12:38:04 PM Ben Jackson did opine:
On Thu, Feb 09, 2012 at 11:23:47AM +0200, andy pugh wrote:
It is servo-thread only as it uses floating-point. I am not entirely
sure why.
Aha, that's why I added the laser-thread in my HAL: A base-period
thread with FP
On Thu, Feb 9, 2012 at 12:39 PM, gene heskett ghesk...@wdtv.com wrote:
I wonder if that is a hangover from when most computers needed a floating
point chip installed?
no, a context switch involving a FP processor was expensive time-wise,
older systems couldn't afford it. Not sure if the
On Thu, 2012-02-09 at 12:39 -0500, gene heskett wrote:
On Thursday, February 09, 2012 12:38:04 PM Ben Jackson did opine:
On Thu, Feb 09, 2012 at 11:23:47AM +0200, andy pugh wrote:
It is servo-thread only as it uses floating-point. I am not entirely
sure why.
Aha, that's why I added
On Thursday, February 09, 2012 01:58:53 PM Kirk Wallace did opine:
On Thu, 2012-02-09 at 12:39 -0500, gene heskett wrote:
On Thursday, February 09, 2012 12:38:04 PM Ben Jackson did opine:
On Thu, Feb 09, 2012 at 11:23:47AM +0200, andy pugh wrote:
It is servo-thread only as it uses
gene heskett wrote:
On Thursday, February 09, 2012 12:38:04 PM Ben Jackson did opine:
On Thu, Feb 09, 2012 at 11:23:47AM +0200, andy pugh wrote:
It is servo-thread only as it uses floating-point. I am not entirely
sure why.
Aha, that's why I added the laser-thread in my
Kirk Wallace wrote:
My understanding is, it is because RTAI (loadrt) has no floating point
functions. Floating point has to be done in userland (loadusr). But now
that I mention it, then why would one specify even a servo thread? I
guess I don't have an understanding.
No, sorry. The servo
Greetings all;
I have now managed to wreck 3 or 4 half completed attempts at this board by
typu's in my code driving the tapered hole probe too far, so I have turned
to the contact probes construction.
1. Assume the spindle carrying the ground is turning 2-400 rpms so that any
runnout is
On Wed, Feb 08, 2012 at 03:06:51PM -0500, gene heskett wrote:
2. The response to a true from the probe is at worst the servo threads lag
to get the stopping initiated. So I do 2 probes, one at say 4ipm, back up
a bit, 0.010 maybe, and redo it at say .2 ipm for a final G38.2 snapshot
On Wednesday, February 08, 2012 06:32:13 PM Ben Jackson did opine:
On Wed, Feb 08, 2012 at 03:06:51PM -0500, gene heskett wrote:
2. The response to a true from the probe is at worst the servo threads
lag to get the stopping initiated. So I do 2 probes, one at say
4ipm, back up a bit,
On Wed, Feb 08, 2012 at 06:38:48PM -0500, gene heskett wrote:
If you are using stepgen underneath you can capture the position at the
base period instead. It's tricky in 2.4 (to cancel out the zero
offsets) but I think someone brought out a simpler pin in 2.5. I use
that trick to get
On Wednesday, February 08, 2012 07:05:59 PM Ben Jackson did opine:
On Wed, Feb 08, 2012 at 06:38:48PM -0500, gene heskett wrote:
If you are using stepgen underneath you can capture the position at
the base period instead. It's tricky in 2.4 (to cancel out the
zero offsets) but I think
On Wed, Feb 08, 2012 at 07:08:51PM -0500, gene heskett wrote:
https://github.com/bjj/2x_laser/blob/master/2x_Laser.hal
I had to go back to the top of it where you renamed the BASE_THREAD to make
sense out of it, but now I see how its done. Kewl, thanks bookmarked,
Ben.
On 9 February 2012 01:38, gene heskett ghesk...@wdtv.com wrote:
And I know there is a debounce gizmo I have not
studied yet, can it be made suitably slow at going back false only?
http://www.linuxcnc.org/docview/html/man/man9/debounce.9.html
Or perhaps there is a re-triggerable one shot
On Thursday, February 09, 2012 02:22:45 AM andy pugh did opine:
On 9 February 2012 01:38, gene heskett ghesk...@wdtv.com wrote:
And I know there is a debounce gizmo I have not
studied yet, can it be made suitably slow at going back false only?
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