Hi,
I'm facing a slightly unusual problem and before I head forward into the
wrong direction I'd like to hear what you think about it:
I have to pan a laser scanner (a single rotary axis), so I thought about
using a BLDC (which I happen to have already), a MESA 7I39 BLDC
controller and a BeagleBon
On 22 April 2014 17:24, Florian Rist wrote:
> So, first question: Can I hook up the 7I39 to a BeagleBone Black. Well
> of course I can, but is this somehow supported already, so that it is
> simple to do? Any other driver suggestions?
The problem here is that the 7i39 expects a three-phase PWM s
Hi Andy,
thanks for you comments.
> Alternatively the Pico PWM brushless servo amp only needs a single
> channel of PWM:
> http://www.pico-systems.com/acservo.html
Ah, I see that would make thinks much easier. And I'm not forced to use
the Beaglbone I could was well you a micro/nanoATX board and
I think this could be done as a geared solution, if you could work
from a phase locked (to 50hz) clock at some higher rate, and use that
as the encoder signal, and the 50hz as a trigger to g76 with suitable
parameters it would then be synchronised and have a flyback (gate the
laser off then), or us
On 22 April 2014 18:20, Florian Rist wrote:
> Is there something like a PLL component in LinuxCNC
Not as far as I know.
Or perhaps the better answer is "not yet".
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
---
Hi Dave
> I think this could be done as a geared solution,
Of couse, I forgot to mention, there will be a reduction gear about 1:50
or 1:100, the motor is not very strong and the scanner ways about 5 kg
and will be mounted eccentrically, so it will create quite some torque
and inertial mass.
> i
On 22 April 2014 18:38, Florian Rist wrote:
> By the way, can the starting angular position of the thread be specified
> in LinuxCNC?
Not directly. For multi-start threads you offset the starting position.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
--
Hi Andy
> Not directly. For multi-start threads you offset the starting position.
So two G33.1 calls at the same position and with the same parameters or a Z
offset of an integer multiple of the pitch will cut the same thread. In a way
the thread starts always at 0°.
See you
Flo
-
On 04/22/2014 12:20 PM, Florian Rist wrote:
> Hi Andy,
> thanks for you comments.
>
>> Alternatively the Pico PWM brushless servo amp only needs a single
>> channel of PWM:
>> http://www.pico-systems.com/acservo.html
> Ah, I see that would make thinks much easier.
You COULD, in theory, run it with
Hi Jon
>>> http://www.pico-systems.com/acservo.html
>>
>> Ah, I see that would make thinks much easier.
>
> You COULD, in theory, run it with just the Direction signal in
> synchronous antiphase mode, but this may cause the
> filter inductors (and maybe the motor, too) to run hot.
> Our servo amp
On Tue, 22 Apr 2014, Florian Rist wrote:
Date: Tue, 22 Apr 2014 18:24:42 +0200
From: Florian Rist
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back
+ Mesa 7I39,
On 04/23/2014 09:07 AM, Florian Rist wrote:
> Hi Jon
>
http://www.pico-systems.com/acservo.html
>>> Ah, I see that would make thinks much easier.
>> You COULD, in theory, run it with just the Direction signal in
>> synchronous antiphase mode, but this may cause the
>> filter inductors (and may
Hi Jon
> Andy Pugh suggested you could run my PWM servo amps with
> just ONE wire/output pin. That is what I was referring to,
> and that two wires would be better.
Ah, OK. Got it. Thank for the clarification.
> With sign/magnitude control, there is no output
> until the PWM signal has pulses
On 23 April 2014 16:57, Jon Elson wrote:
> Andy Pugh suggested you could run my PWM servo amps with
> just ONE wire/output pin
What I was meaning was that it only needed one PWM channel, rather
than the phase-locked 3-phase PWM that the 7i39 needs.
I wasn't suggesting that it didn't also need dir
Hi Andy
>> Andy Pugh suggested you could run my PWM servo amps with
>> just ONE wire/output pin
>
> What I was meaning was that it only needed one PWM channel, rather
> than the phase-locked 3-phase PWM that the 7i39 needs.
> I wasn't suggesting that it didn't also need direction, enable etc pins
On 04/23/2014 12:06 PM, andy pugh wrote:
> On 23 April 2014 16:57, Jon Elson wrote:
>> Andy Pugh suggested you could run my PWM servo amps with
>> just ONE wire/output pin
> What I was meaning was that it only needed one PWM channel, rather
> than the phase-locked 3-phase PWM that the 7i39 needs.
On 24 April 2014 02:17, Jon Elson wrote:
> But, yes, a Mesa controller has a full sign/magnitude output
> available. I wasn't sure Florian was going to use a
> traditional controller and Hal for this.
I think there is some confusion here still.
The 7i39 needs three channels of PWM, one channel
Hi,
thanks for all your comments so fare.
>> 0. move to home position (0°)
>> 1. wait for low frequency trigger, a hardware or a software signal
>> 2. within say 10° accelerate and synchronises to the 50Hz trigger
>> so that the 10° position is reached 20ms after the last trigger
>> and
On Friday 25 April 2014 11:08:55 Florian Rist did opine:
> Hi,
> thanks for all your comments so fare.
>
> >> 0. move to home position (0آ°)
> >> 1. wait for low frequency trigger, a hardware or a software signal
> >> 2. within say 10آ° accelerate and synchronises to the 50Hz trigger
> >>
>
Hi
>> [Beaglebone black + BLDC contorller]
>
> Alternatively the Pico PWM brushless servo amp only needs a single
> channel of PWM:
> http://www.pico-systems.com/acservo.html
A Gecodrive G320X [1] would be even easier to run from a Beaglebone as
it does not require a PWM/Dir but a Step/Dir signal
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