On Thu, 2008-06-05 at 21:19 -0500, Jon Elson wrote:
...snip
If you have a spindle encoder, you could make HAL read the encoder
velocity and add a correction to the PWM output.
Jon
It was talked about before, but I don't remember the outcome. The
software encoder has a velocity output pin,
Kirk Wallace wrote:
What are the issues with choosing a PWM frequency? I would think that
efficiency would be one, where you would balance switching losses and
iron or copper losses? Evidence of this might be seen as higher motor or
amp temperatures? Lower frequencies might produce noise. I
At 10:22 PM 6/5/2008, you wrote:
[big scissor sound]
- Steve
I don't know why, but that got a big giggle out of me this morning... ;-)
mark
-
Check out the new SourceForge.net Marketplace.
It's the best place to buy or
On Thu, 2008-06-05 at 20:54 -0700, Kirk Wallace wrote:
On Thu, 2008-06-05 at 21:19 -0500, Jon Elson wrote:
Kirk Wallace wrote:
A while back I played with a KBIC speed controller which demonstrated
fairly good torque at high and low speeds. I was curious about how a PWM
amp would do, so
I'll carry on with my experiments as I would like to support as many
distros as possible but if it turns into too much of a nightmare I'll
make a deb and only support Debian based distros.
Les
Moses O McKnight wrote:
I would second Ray on .deb files. Another thing to consider is that
since
Hi
Can anyone tell me what kind of parallel port pci card I need to connect
my computer to the breakout board. I have one computer with no parallel
port and another computer with a parallel port that does not give out the
right signals I presume. I need to get one of them to work.
Thanks
aaron Moore wrote:
Hi
Can anyone tell me what kind of parallel port pci card I need to connect
my computer to the breakout board. I have one computer with no parallel
port and another computer with a parallel port that does not give out
the right signals I presume. I need to get one of
I picked up a cheap ($10) unit from the local computer store - I think they
have dual port cards and I can already see I'm going to be adding more
signals than my PCI slots will allow with single port cards so I'll probably
go back. Just about any card should work - the wiki explains finding the
I concur on the 2 port card. It's always nice to have an extra port.
I added a single port card to my machine that had a built-in and
would have put a 3 port in if I'd had it.
I like I/O ;^)
Emory
On Fri, Jun 6, 2008 at 6:33 AM, Ed [EMAIL PROTECTED] wrote:
aaron Moore wrote:
Hi
Can
At 12:20 AM 6/6/2008, you wrote:
Aram,
i talk to company that manufacture encoder with 5 000 000 pulses per rev.
the problem is that that encoder has MAXIMUM rpm less than 200 rpm!!!
so that encoder can be speen faster than 200 rpm because frequences not
enogh to keep so much pulses.
if you
On Fri, 6 Jun 2008, Jon Elson wrote:
Date: Fri, 06 Jun 2008 11:11:07 -0500
From: Jon Elson [EMAIL PROTECTED]
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] PWM Amp
On Fri, 2008-06-06 at 11:11 -0500, Jon Elson wrote:
Kirk Wallace wrote:
On Thu, 2008-06-05 at 21:19 -0500, Jon Elson wrote:
...snip
If you have a spindle encoder, you could make HAL read the encoder
velocity and add a correction to the PWM output.
Jon
It was talked about
I just checked the wiki and someone wanted some acme thread for fest.
I happen to have some 1 if they can figure out a way to mount it.
Any idea who we blame for this?
Dave
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Check out the new SourceForge.net Marketplace.
On Fri, Jun 06, 2008 at 03:13:01PM -0700, Dave Engvall wrote:
I just checked the wiki and someone wanted some acme thread for fest.
I happen to have some 1 if they can figure out a way to mount it.
Any idea who we blame for this?
That's my request! If you have a shortish piece, and if the
Chris Radek wrote:
On Fri, Jun 06, 2008 at 03:13:01PM -0700, Dave Engvall wrote:
I just checked the wiki and someone wanted some acme thread for fest.
I happen to have some 1 if they can figure out a way to mount it.
Any idea who we blame for this?
That's my request! If you have a
OK, more dumb questions. Would a short ball screw do what you want?
It certainly would be more precise than acme rod; or do I miss the
intent?
If I remember I can bring ER40 1, .75 and .625 collets. I think I
have all three.
Dave
On Jun 6, 2008, at 3:23 PM, John Kasunich wrote:
Chris Radek
On Fri, 2008-06-06 at 17:30 -0700, Eric Laycock wrote:
I need a copy of the emc live on a cd . Can anyone help?thank,
Eric
I could do that but we should be able to find someone near you to burn
that disk for you. The images for both 6.06 and 8.04 are available for
download. Contact me off
I received a Pluto today and started playing with it. Thanks to some
help from the IRC (Thank you Skunkworks) I got the driver to load using
LPT1 (378). Although, it loads without the apparent fix (epp_wide=0) now
too. The driver and EMC loads with my PCI parport card, but it it
doesn't respond to
On Fri, 2008-06-06 at 22:31 -0400, Stephen Wille Padnos wrote:
Check to see if the parameter pluto.whatever.pwm.is-pdm is set. If
so, try clearing that bit. That sets PDM or Interleaved PWM mode,
which operates similarly to a step generator - it outputs as high a
frequency as possible, to
Peter C. Wallace wrote:
A reasonable hack might be to use the previous delta for velocity if index
(and a count clear event) happened
Good thought, this condition will only exist for one servo
cycle, so it shouldn't cause any problems for a spindle speed
control algorithm.
Jon
Kirk Wallace wrote:
Feedback would start with ppmc.X.encoder.X.delta? Is encoder delta reset
to zero and at what event? This would then be scaled/converted to RPM
and fed to pid.X.feedback and possibly a speed display.
Encoder.xx.delta is never reset. It is derived by subtracting
the last
Kirk Wallace wrote:
I received a Pluto today and started playing with it. Thanks to some
help from the IRC (Thank you Skunkworks) I got the driver to load using
LPT1 (378). Although, it loads without the apparent fix (epp_wide=0) now
too. The driver and EMC loads with my PCI parport card, but
On Fri, 2008-06-06 at 23:32 -0500, Jon Elson wrote:
... snip
My guess is the Pluto is using synchronous antiphase modulation,
where the bridge is switching the transistors on 50% of the time
at idle. This provides full DC supply voltage across the
inductor at the PWM frequency, and heating
On Fri, 2008-06-06 at 23:08 -0500, Jon Elson wrote:
Kirk Wallace wrote:
Feedback would start with ppmc.X.encoder.X.delta? Is encoder delta reset
to zero and at what event? This would then be scaled/converted to RPM
and fed to pid.X.feedback and possibly a speed display.
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