Re: [Emc-users] CNC Plasma Tube Notcher

2017-06-16 Thread Klemen Živkovič 
Very nice indeed -  I like pneumatic centering mechanism.
However I am wondering why you didn't make it with 4 grips so you could
clamp quadratic pipes?

Rectangular pipes are probably out of reach to handle with this machine?

Regards

On Fri, Jun 16, 2017 at 2:56 PM, N. Christopher Perry 
wrote:

>
> > On Jun 16, 2017, at 12:50 AM, Kurt Jacobson 
> wrote:
> >
> > Hello all,
> >
> > Some of the videos linked in the "LCNC TED Talk style" thread reminded me
> > of a CNC plasma tubing notcher I designed and built a few years ago
> while I
> > was in school. I think some of you might be interested.
> >
> > As built the notcher has a capacity of 4". It consists of a rotating
> > pneumatically actuated chuck and a horizontal linear axis that moves the
> > torch to and fro along the axis of the tube.
> >
> > The fab shop I designed the notcher for usually had the client provide
> them
> > with CAD generated templates, so one of the goals of the project was to
> be
> > able to scan in these templates and generate G-code so multiple notches
> > could be cut. I used a simple probing sub and a fiber optic sensor in
> place
> > of the plasma tourch to scan a template warped around a tube. This was
> slow
> > but worked well and was reliable.
> >
> > For cases were a template was not provided I wrote a small MATLAB program
> > and GUI to generate the g-code given the joint parameters.
> >
> > I initially used Mach3 for the control, but then I switched to GRBL with
> a
> > custom interface so they would not have to keep a Win XP PC with parport
> > around just to run the notcher. What I would love to do is rework it to
> > have LinuxCNC on a BB or RPi on board with a small touch screen. It would
> > be fairly easy to write a custom interface so machine control, template
> > scanning and G-code generation could all be done from one interface.
> >
> >
> > A google photo album of the notcher build:
> > https://goo.gl/photos/RcgPV2fRfD5ChmQ39
> >
> >
> > Early video of notcher in action:
> > https://youtu.be/uZP3JNNKDLQ
> >
> > Following a scanned template:
> > https://youtu.be/DsCuw9TPBeY
> >
> > Scanning a template:
> > https://youtu.be/QfmZeYXlU6E
> >
> > Chuck self centering small diameter:
> > https://youtu.be/5S8kO3-p4vs
> >
> >
> > TubeNotch MATLAB program:
> > https://github.com/KurtJacobson/TubeNotch
> >
> >
> > Regards,
> > Kurt
>
> That's some very nice work!
>
> N. Christopher Perry
>
> 
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Re: [Emc-users] CNC Plasma Tube Notcher

2017-06-16 Thread N. Christopher Perry 

> On Jun 16, 2017, at 12:50 AM, Kurt Jacobson  wrote:
> 
> Hello all,
> 
> Some of the videos linked in the "LCNC TED Talk style" thread reminded me
> of a CNC plasma tubing notcher I designed and built a few years ago while I
> was in school. I think some of you might be interested.
> 
> As built the notcher has a capacity of 4". It consists of a rotating
> pneumatically actuated chuck and a horizontal linear axis that moves the
> torch to and fro along the axis of the tube.
> 
> The fab shop I designed the notcher for usually had the client provide them
> with CAD generated templates, so one of the goals of the project was to be
> able to scan in these templates and generate G-code so multiple notches
> could be cut. I used a simple probing sub and a fiber optic sensor in place
> of the plasma tourch to scan a template warped around a tube. This was slow
> but worked well and was reliable.
> 
> For cases were a template was not provided I wrote a small MATLAB program
> and GUI to generate the g-code given the joint parameters.
> 
> I initially used Mach3 for the control, but then I switched to GRBL with a
> custom interface so they would not have to keep a Win XP PC with parport
> around just to run the notcher. What I would love to do is rework it to
> have LinuxCNC on a BB or RPi on board with a small touch screen. It would
> be fairly easy to write a custom interface so machine control, template
> scanning and G-code generation could all be done from one interface.
> 
> 
> A google photo album of the notcher build:
> https://goo.gl/photos/RcgPV2fRfD5ChmQ39
> 
> 
> Early video of notcher in action:
> https://youtu.be/uZP3JNNKDLQ
> 
> Following a scanned template:
> https://youtu.be/DsCuw9TPBeY
> 
> Scanning a template:
> https://youtu.be/QfmZeYXlU6E
> 
> Chuck self centering small diameter:
> https://youtu.be/5S8kO3-p4vs
> 
> 
> TubeNotch MATLAB program:
> https://github.com/KurtJacobson/TubeNotch
> 
> 
> Regards,
> Kurt

That's some very nice work!

N. Christopher Perry 

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Re: [Emc-users] LCNC TED Talk style

2017-06-16 Thread TJoseph Powderly 

i replied direct to dave, so the user list didnt see this

it maybe of use for the talk
"""

hi dave
maybe it was

viestartss 

https://www.youtube.com/watch?v=WSQO3IkQ0Lo
while we're at it
rudy de prez's paper may be interesting

and the antenna array using linuxcnc
i didnt find it yet :-(

tomp tjtr33

On 06/15/17 21:15, dave wrote:
Can someone find a video of the guy from Finland (vistuers ???) and 
his mig welding of pipe T's?

It has been a while and I can't even find an email address.

Dave

"""
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Re: [Emc-users] LCNC TED Talk style

2017-06-16 Thread Sven Wesley 
2017-06-15 19:07 GMT+02:00 Jon Elson :

> On 06/15/2017 09:15 AM, dave wrote:
>
>> Can someone find a video of the guy from Finland (vistuers ???) and his
>> mig welding of pipe T's?
>> It has been a while and I can't even find an email address.
>>
>>
> Viesturs Lacis :
> https://www.youtube.com/watch?v=WSQO3IkQ0Lo
>
> Jon


Veistur's Latvian welding robot is already on the list of chosen vids. :)
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Re: [Emc-users] LCNC TED Talk style

2017-06-16 Thread Sven Wesley 
2017-06-16 3:30 GMT+02:00 Jon Elson :

> On 06/15/2017 06:10 PM, Ralph Stirling wrote:
>
>> I don't believe Robert Ellenberg's PhD thesis was related to
>> his LinuxCNC motion planner work.  His thesis title is:
>> "A Stability-Estimator to Unify Humanoid Locomotion: Walking,
>> Stair-Climbing and Ladder-Climbing"
>>
>> The link to it is:
>> https://idea.library.drexel.edu/islandora/object/idea%3A4538
>> /datastream/OBJ/download/A_Stability-Estimator_to_Unify_
>> Humanoid_Locomotion.pdf
>>
>> My recollection is that Tormach paid him to work on the motion
>> planner (for both LinuxCNC and Machinekit).  I could be wrong,
>> but perhaps he will pop in here and give the definitive answer.
>>
>>
>> Yes, I can believe that his thesis did not come directly out of LinuxCNC,
> but I think there WAS some tie-in.  There may have been some mathematical
> problems that he solved for one of these projects that was helpful in the
> other.
>
> The basic TP problem with the old EMC was lookahead, and that was the
> problem that Robert tackled.  A general solution to executing a series of
> moves as fast as possible while always obeying velocity and acceleration
> limits.  I can see why similar problems might come up in any kind of motion
> system that makes complex movements.
>
>
> Jon
>
> There's quite a big difference in the academic world when you can claim a
PhD or not. My wife has a PhD in Medicine from Karolinska in Sweden. It
took 5½ years and required 4 published articles, at the same time you write
one article for a technical degree and it takes 3 years. For sure you can
write many articles under your PhD studies and they can include a broad
spectra of issues. If he used LinuxCNC to prove ideas they are a part of
his PhD.
But there's no need for us to guess about it. I'll ask him directly. :)
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