Scott Hasse wrote:
> As a follow-up I had a chance to look at my frequency signal with a digital
> scope and found that it was indeed unstable to the tune of 20%.
Well, when nothing makes sense, it is always best to start at the
beginning, and make
sure the input to the first component is good bef
Kasey Matejcek wrote:
> Found that the a,b signal were hook up backward it help a lot
> Still not smooth but operates close need more tunning now that it works
>
OK, great! That's what I should have suggested a while ago, took me a
bit to
think this could be the problem.
Jon
---
As a follow-up I had a chance to look at my frequency signal with a digital
scope and found that it was indeed unstable to the tune of 20%. I had not
expected that as I used an LM331 chip with seemingly appropriate
components. Hooking a real function generator to the input worked great,
with the
Peter C. Wallace wrote:
> On Wed, 11 Jul 2012, Jon Elson wrote:
>
>
>> Date: Wed, 11 Jul 2012 12:37:03 -0500
>> From: Jon Elson
>> Reply-To: "Enhanced Machine Controller (EMC)"
>>
>> To: "Enhanced Machine Controller (EMC)"
>> Subject: Re: [Emc-users] Spindle hooked to dc servo amp
>>
>> K
Found that the a,b signal were hook up backward it help a lot
Still not smooth but operates close need more tunning now that it works
-Original Message-
From: Jon Elson [mailto:el...@pico-systems.com]
Sent: Wednesday, July 11, 2012 12:37 PM
To: Enhanced Machine Controller (EMC)
Subject:
On Wednesday 11 July 2012 14:16:21 Peter C. Wallace did opine:
> On Wed, 11 Jul 2012, Jon Elson wrote:
> > Date: Wed, 11 Jul 2012 12:37:03 -0500
> > From: Jon Elson
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> >
> >
> > To: "Enhanced Machine Controller (EMC)"
> > Subject: Re: [
On Wed, 11 Jul 2012, Jon Elson wrote:
> Date: Wed, 11 Jul 2012 12:37:03 -0500
> From: Jon Elson
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Spindle hooked to dc servo amp
>
> Kasey Matejcek wrote:
>> Yes the ppmc.0
On Wednesday 11 July 2012 13:34:18 Jon Elson did opine:
> Gene Heskett wrote:
> > Yikes Jon. I have mine set for only 500hz, higher obviously limits the
> > resolution of the control, at least in my system. I tried 10khz once
> > but found I only had about 4 or 5 steps from creep to wide open due
Kasey Matejcek wrote:
> Yes the ppmc.0.pwm.00-03.freq 5
> After playing some time I've come up with this it responds from 2 rpm to 14
> rpm when you set s this give and accual spindle speed from about 35 to 75
> rpm
> But there is no to little control if load is applied to the spindle
> As soo
andy pugh wrote:
>
> The LinuxCNC "bldc" component understands the Fanuc "red cap"
> commutation scheme, though, and can convert it to suit drives with a
> different feedback requirement (synthetic Hall signals, for example)
>
This is only true for the first-generation pulse coders, the later on
Gene Heskett wrote:
> Yikes Jon. I have mine set for only 500hz, higher obviously limits the
> resolution of the control, at least in my system. I tried 10khz once but
> found I only had about 4 or 5 steps from creep to wide open due to the loss
> in base thread counts per output hz.
>
Oh, y
I've done as little as .0001
-Original Message-
From: andy pugh [mailto:bodge...@gmail.com]
Sent: Wednesday, July 11, 2012 7:15 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Spindle hooked to dc servo amp
On 11 July 2012 13:07, Kasey Matejcek wrote:
> But there is n
On 11 July 2012 16:10, Peter C. Wallace wrote:
> hardware stepgen maxaccel should be set to about 20% greater than
> motions maxaccel
In that case the answer is probably to add a STEPGEN_MAXACCEL number
in the INI file and alter the HAL file to look at that instead. (And
to set that number 20% h
snip--
>I would be tempted to set the stepgen maxaccel to 0 (n the HAL, not
>the INI!) , and let the trajectory planner handle accelleration.
>--
>atp
>If you can't fix it, you don't own it.
>http://www.ifixit.com/Manifesto
Unless y
On 11 July 2012 15:29, Viesturs Lācis wrote:
> Second of all, I am surprised to see MIN_VELOCITY parameter.
...
> BTW placing all those velocity and acceleration parameters in [TRAJ]
> section, where they belong, would make the file easier to read for
> others. You somehow have them in Display s
Hi all,
I have been managing with a work-around, but am now getting back to this. I
am working from the below response from Dewey from a few months back.
It looks to me from the below response that encoder_scale maps to
INPUT_SCALE and amplifier_scale to OUTPUT_SCALE under the axis parameters in
Hugh Wylie wrote:
> However, changing to teleop (world) mode always give rise to Y and/or A
> joint drive racking, and after much experimentation with .ini and .hal
> parameter adjustment, we have observed what appears to be the cause of this
> racking. Although it occurs more frequently at higher
First of all, edit Your INI file and set A joint from angular to
linear, because that joint _is_ linear. And then try again.
Second of all, I am surprised to see MIN_VELOCITY parameter. Try to
set it at 0, maybe that has something to do with very low
accelerations, when the actual speed during acce
Has anyone experienced the issues which we are experiencing on a
robustly-designed gantry comprising the Y-axis of a large-bed CNC router
(size 2.75 x 1.83m bed)?
The system runs LinuxCNC 2.5 on Core 2 Duo platform equipped with Mesa 5i23
(firmware SVST4_8) controlling the four stepper motors (
On Wednesday 11 July 2012 10:02:09 andy pugh did opine:
> On 11 July 2012 14:03, Gene Heskett wrote:
> > The screw I assume was a long stock
> > sized allen socket setscrew with the newer, smaller thread cut on the
> > end?
>
> Indeed.
>
> > Having toured the lumber yards and tractor supply loc
On 11 July 2012 14:03, Gene Heskett wrote:
> The screw I assume was a long stock
> sized allen socket setscrew with the newer, smaller thread cut on the end?
Indeed.
> Having toured the lumber yards and tractor supply locally, that is
> something I'd have to get from amazon or ??
I think I got
I subbed to the rtai list a week ago in hopes I might glean some info on
the current status of rtai.
A few terse messages went by this morning advising that it is working on
the 2.6.38.8 kernels now, with something called vulcano and their patch.
The 2.6.38.8 kernel, with the bfs 0.416 patch is
Yes sorry I was assuming he already had the machine and the drive went bad,
he was looking for an alternative. If this If this is the case all of the
wires brought to the existing drive are flying lead, so the encoder pulse
wire is already there. I have repaired several of the existing drives.
Th
On Wednesday 11 July 2012 07:42:56 andy pugh did opine:
> On 11 July 2012 02:14, Gene Heskett wrote:
> > And that seems to have worked, for this particular final size. Is
> > there any way to effectively predict which will give the correct
> > result
>
> One function rounds up, and one rounds d
On 11 July 2012 13:07, Kasey Matejcek wrote:
> But there is no to little control if load is applied to the spindle
> As soon as any p,I,g are added then it unstable surging up and down
How much Igain are you adding? I would expect it to need to be no
higher than 0.05 and I would probably start a
Yes the ppmc.0.pwm.00-03.freq 5
After playing some time I've come up with this it responds from 2 rpm to 14
rpm when you set s this give and accual spindle speed from about 35 to 75
rpm
But there is no to little control if load is applied to the spindle
As soon as any p,I,g are added then it u
On 11 July 2012 12:22, Gabriel Willen wrote:
> I would think most industrial vfd's would work in conjunction with a mesa
> card that has +- 10V.
I think that Fanuc motors are AC synchronous (brushless permanent
magnet) so need a closed-loop drive.
The LinuxCNC "bldc" component understands the Fa
There are grey scale absolute rotary encoders that are fairly cheap. I
think those would be a better test than linears since you have to handle
the wrap around accumulation. It would be a simple case to use a linear
encoder if the rotary worked.
Stephen
--
I would think most industrial vfd's would work in conjunction with a mesa
card that has +- 10V.
On Tue, Jul 10, 2012 at 2:01 PM, wrote:
> hi
> is there proven spindle drive for fanuc spindle motor?
> machine is working good but in case of problem i think it will be
> better replace whole old fan
Finding a quality spindle that is not designed
for collets or other interchangeable tool holders
is difficult. Usually these are custom items.
You might try:
http://www.ekstromcarlson.com/index.cfm/category/2/motors.cfm
http://www.pdscolombo.com/info_contact.php
Regards,
Steve Stallings
>
On 11 July 2012 06:58, Viesturs Lācis wrote:
> Can anyone suggest any other manufacturer of compact, square AC
> induction motor, besides Elte?
> I am trying to find something on google, but obviously the selection
> of keywords is not my strength as I do not get anything useful.
I don't think y
On 11 July 2012 04:06, Kasey Matejcek wrote:
> It set to 1000
> setp ppmc.0.pwm.03.scale 1000
There goes that idea then.
> when you watch ppmc.0.pwm.03.value it changes from 1000 to -1000 and back
> and forth it goes
> when I set s 50 rpm then after some time ppmc.0.pwm.03.value goes to like 50
On 11 July 2012 02:14, Gene Heskett wrote:
> And that seems to have worked, for this particular final size. Is there
> any way to effectively predict which will give the correct result
One function rounds up, and one rounds down, so which is correct
depends on the calculation being performed.
(
33 matches
Mail list logo
