Chris Radek wrote:
>
> That was exactly my thinking too. But as others have pointed out,
> there could be other things at work. Looseness/backlash in the quill
> spline on my bridgeport is significant for instance. The first step
> to compensating for it is measuring it, so I was concentrating
Kirk Wallace wrote:
>
> These are a little embarrassing, but here are some pictures of my
> Pico/Pluto setup:
>
> http://www.wallacecompany.com/machine_shop/Pluto/
>
> The cores of the inductors seem to be heating and not the copper, so it
> takes a while for the heat to be detected. It seems t
Kirk Wallace wrote:
>
> I can certainly try, but I am using the latest 2.2.5 which should be
> fixed. I have pwmdir set true. I measured only logic levels on the dir
> pin and analog on the PWM pin. The no load forward and reverse RPM
> through the range (0 to 5500) was within 50 RPM.
>
OK, not
Jeff Epler wrote:
> Jon,
> What *should* the driving signals look like at the input of your
> amplifiers? I assume from your response that I'm making some kind of
> rookie mistake here, compounded by the fact that I still don't
> understand what the mistake is.
No, maybe not.
My amps were designe
That should have read "re-tuned the DEAD time"
Jon
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Kirk Wallace wrote:
> On Sat, 2008-06-07 at 13:06 -0500, Jon Elson wrote:
> ...snip
>
>>would put the PWM duty cycle at 50%, the worst case. What is
>>your DC supply voltage?
>>
>>Jon
>
>
> 53 VDC unregulated with 500 uF of filter caps. So far the motor has had
> no load. If you need more inf
On Sat, Jun 07, 2008 at 10:06:25AM -0500, Andre' Blanchard wrote:
>
> What is the delay (in degrees of rotation) between reading the spindle
> encoder and positioning the Z axis?
> That delay would be in opposite directions going and coming out.
That was exactly my thinking too. But as others h
don't feel bad :)
http://www.electronicsam.com/images/KandT/servostart/ampmess.JPG
sam
- Original Message -
From: "Kirk Wallace" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)"
Sent: Saturday, June 07, 2008 5:13 PM
Subject: Re: [Emc-users] Pico on Pluto
> On Sat, 2008-06
On Sat, 2008-06-07 at 13:32 -0700, Kirk Wallace wrote:
... snip
> I can certainly try, but I am using the latest 2.2.5 which should be
> fixed. I have pwmdir set true. I measured only logic levels on the dir
> pin and analog on the PWM pin. The no load forward and reverse RPM
> through the range (0
On Sat, 2008-06-07 at 13:24 -0500, Jon Elson wrote:
> Jeff Epler wrote:
> > When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
> > call "sign-magnitude":
> > value after scale+offsetPWM Dir
> > 0.0 0%FALSE
> > 0.5
Jon,
What *should* the driving signals look like at the input of your
amplifiers? I assume from your response that I'm making some kind of
rookie mistake here, compounded by the fact that I still don't
understand what the mistake is.
Jeff
-
On Sat, 2008-06-07 at 13:18 -0500, Jon Elson wrote:
... snip
> thread. The only discontinuity is that you WANT to break the
> continuity of the linear axis to the spindle, or you'd have to
> "rewind" the spindle for each threading pass.
>
> Jon
Shoot, that is simpler than I thought, and makes
On Sat, 2008-06-07 at 13:06 -0500, Jon Elson wrote:
...snip
> would put the PWM duty cycle at 50%, the worst case. What is
> your DC supply voltage?
>
> Jon
53 VDC unregulated with 500 uF of filter caps. So far the motor has had
no load. If you need more information let me know. If you want, I
On Jun 7, 2008, at 11:30 AM, Jon Elson wrote:
> Andre' Blanchard wrote:
>
>> What is the delay (in degrees of rotation) between reading the
>> spindle
>> encoder and positioning the Z axis?
>> That delay would be in opposite directions going and coming out.
> Unless there is mechanical backlash
On Thursday 05 June 2008, Stephen Wille Padnos wrote:
> We've discussed various methods of handling larger data types, which
> this would require.
I don't recall ever seeing any discusssion about the usage of "data types"..
> The good news is that once we have that, we can use
> doubles anywhere
Andre' Blanchard wrote:
> What is the delay (in degrees of rotation) between reading the spindle
> encoder and positioning the Z axis?
> That delay would be in opposite directions going and coming out.
Unless there is mechanical backlash between the spindle itself
and the spindle encoder, this d
Jeff Epler wrote:
> When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
> call "sign-magnitude":
> value after scale+offsetPWM Dir
> 0.0 0%FALSE
> 0.5 50%FALSE
> 1.0
Kirk Wallace wrote:
> Sometimes the the spindle context keeps me from seeing things as they
> should be. More thinking aloud. An encoder still acts the same whether
> it's on a linear axis or spindle. So if the spindle moves, the distance
> is counted, and sometimes, it's a very long move. The del
Kirk Wallace wrote:
>
> I haven't looked at the control signals with a scope. One inductor was
> much hotter than the other. I assumed because it was because I was
> driving the motor mostly one direction. I was planning on using 110
> Volts for the motor supply.
>
Hmm, synchronous antiphase woul
Dave Engvall wrote:
>Hi,
>Does anyone happen to remember where the front panel codewheel to jog
>code resides?
>
>
Uh - what? :)
Jogging (with a wheel) used to be done by halui or something, but it's
in the RT motion controller now. If you're asking about HAL files to
set it up, that shou
Hi,
Does anyone happen to remember where the front panel codewheel to jog
code resides?
TIA
Dave
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On Jun 7, 2008, at 7:23 AM, Chris Radek wrote:
> On Fri, Jun 06, 2008 at 03:57:49PM -0700, Dave Engvall wrote:
>> 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?
>
> I'm not sure I could get the b
At 09:23 AM 6/7/2008, you wrote:
>On Fri, Jun 06, 2008 at 03:57:49PM -0700, Dave Engvall wrote:
> > 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?
>
>I'm not sure I could get the ball of an indic
On Fri, Jun 06, 2008 at 03:57:49PM -0700, Dave Engvall wrote:
> 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?
I'm not sure I could get the ball of an indicator lever to ride in the
track on a bal
When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
call "sign-magnitude":
value after scale+offsetPWM Dir
0.0 0%FALSE
0.5 50%FALSE
1.0100%* FALSE
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