did you test limit2 and limit3, or just limit3? I'm not sure whether
second-derivative limiting (since command is speed, I guess that makes
it a jerk limit) is useful for spindle speed, and it would be nice to
hear real-world results.
Just limit3. I used the basic motion equations s=vt and
you're using feedback speed to decide when to turn off the spindle? why
not use commanded speed instead? or maybe just a timeout based on the 3
second time you mentioned for acceleration (the component 'timedelay'
can do this)?
Jeff
Digest, Vol 37, Issue 15
did you test limit2 and limit3, or just limit3? I'm not sure whether
second-derivative limiting (since command is speed, I guess that makes
it a jerk limit) is useful for spindle speed, and it would be nice to
hear real-world results.
Just limit3. I used the basic
Sorry, a typo. I was using commanded speed. But the timedelay option
sounds more efficient.
-Original Message-
From: Jeff Epler [mailto:jep...@unpythonic.net]
Sent: Friday, 8 May 2009 12:38 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Emc-users Digest, Vol 37
the place. I used lowpass, and got good enough results.
Is there a
component that will smooth out a curve? A moving average?
Are you using HostMot2? HostMot2 has a much better velocity
output than the old M5I20 driver/firmware.
Yes, I'm using HostMot2. The velocity coming out
Frank Tkalcevic wrote:
Are you using HostMot2? HostMot2 has a much better velocity
output than the old M5I20 driver/firmware.
Yes, I'm using HostMot2. The velocity coming out of the encoder was fuzzy,
and combining that with my poor PID tuning caused vibration at low speeds.
Hm, the hm2
Frank Tkalcevic wrote:
Yes, I'm using HostMot2. The velocity coming out of the encoder was fuzzy,
and combining that with my poor PID tuning caused vibration at low speeds.
Which version of emc2 are you using?
--
Sebastian Kuzminsky
you press what you hope is the right switch, and you
Hm, the hm2 encoder velocity output is supposed to be really smooth.
I'll double check it tonight. Any chance you can supply a
halscope trace of it looking bad on your machine?
I'm using 2.3.
Here's a trace of the commanded velocity (after going through limit3),
encoder velocity (*60) and
Frank Tkalcevic wrote:
Hm, the hm2 encoder velocity output is supposed to be really smooth.
I'll double check it tonight. Any chance you can supply a
halscope trace of it looking bad on your machine?
I'm using 2.3.
Here's a trace of the commanded velocity (after going through limit3),
Sebastian Kuzminsky wrote:
Frank Tkalcevic wrote:
Hm, the hm2 encoder velocity output is supposed to be really smooth.
I'll double check it tonight. Any chance you can supply a
halscope trace of it looking bad on your machine?
I'm using 2.3.
Here's a trace of the commanded velocity
Here's a trace of the commanded velocity (after going
through limit3),
encoder velocity (*60) and the lowpass output.
http://www.franksworkshop.com.au/img_bin/Velocity.png
The encoder scale is 12000; 12000 pulses representing 1
revolution.
The encoder velocity output is then
On Wed, May 06, 2009 at 04:37:07PM +1000, Frank Tkalcevic wrote:
I've just configured my first emc project, a 9x20 lathe
conversion. I'm
using a large servo for the spindle - I'm hoping to be able
to use it as a
4th axis for some light engraving down the track.
My problem - I've
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