Re: [Emc-users] Wish me luck. I am downloading v.18 of freecad as src, gonna see if I can build a 32 bit version

[grumpy--- via Emc-users]

you don't need a $500 dollar rig
i regularly run freecad on one of these little boards
https://www.asrock.com/mb/Intel/Q1900M Pro3/index.asp
https://www.grooves-inc.com/asrock-q1900m-inkl-intel-celeron-j1900-mainboard-asrock-hardware-electronic-pZZa1-2097728559.html

On Sat, 23 Mar 2019, Chris Albertson wrote:


Would be faster to dumpster dive a PC.   I doubt you'd ever get a modern
CAD app to compile on a small ARM-based board.   It would take weeks of work

Don't you have a good Linux PC with at least an i7 processor?  3D CAD, even
if you could get it to build on low-end hardware would be horrible to use.
  You want at least the i5, 4GB RAM and a 20" screen with a good GPU card.
  But even that would lag badly.  A newer quad core i7 is a better
processor.   You want the image to re-render nearly instantly, faster than
human reflexes can detect. Otherwise, you don't get smooth rotations.
To be usable the 3D model on the screen has to move as well as if you were
holding a physical model in your hand.  If the screen image lags detectably
it is unnatural to use.

CAD is one of the use cases that justify "workstation" class computers.
The other might be video editing and sound mixing or high-end video games.

On Sat, Mar 23, 2019 at 6:39 PM Gene Heskett  wrote:


Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 



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--

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] STM32 Blue Pill

[grumpy--- via Emc-users]

On Sat, 9 Mar 2019, Gene Heskett wrote:


On Saturday 09 March 2019 07:53:05 Nicklas Karlsson wrote:


On Sat, 9 Mar 2019 at 11:59, Nicklas Karlsson

 wrote:

I think CPU Cortex-M4 is a lot slower than arduino


Really? That isn't my experience. Given that the M4 is running at
120MHz and the Arduino is 8MHz and both are running the same code?


No I got it wrong and mixed it with raspberry, I think.


The pi's huge, glaring slow i/o problem is that internal usb-2 hub. AIUI,
only the wifi and gpio bypass that huge bottleneck.




maybe this would help
https://geekworm.com/collections/raspberry-pi-hats/products/x820-v3-0-usb-3-0-2-5-inch-sata-hdd-ssd-storage-expansion-board


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Re: [Emc-users] How come....

[grumpy--- via Emc-users]

i have no knowledge to add to this subject but it is all very good info for 
possible future projects
i have been waiting for someone to add saltwater batteries to the discussion


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Re: [Emc-users] building for sim and rip

[grumpy--- via Emc-users]

On Tue, 9 Jul 2019, grumpy--- via Emc-users wrote:


On Mon, 8 Jul 2019, andy pugh wrote:


On Mon, 8 Jul 2019 at 18:35, grumpy--- via Emc-users
 wrote:


i am running debian stretch
i did not see any prebuilt packages for stretch and sim


"uspace" is the new "sim".

"uspace will work on either a preempt-RT kernel (and will declare
"Using POSIX realtime"  if you start LinuxCNC from the command line)
and also on a conventional kernel "POSIX non-realtme".

This is slightly more useful than the old pure-simulator as (as far as
I know) it is possible to drive parallel port pins with POSIX
non-realtime, though not with any timing guarantees.



i added to /etc/apt/sources.list

deb http://buildbot.linuxcnc.org/ stretch master-rtpreempt
deb-src http://buildbot.linuxcnc.org/ stretch master-rtpreempt

when i run "apt-get install linuxcnc-uspace" apt wants to install a new 
kernel

how is the best way to get linuxcnc-uspace and keep my curent kernel



apt-get --no-install-recommends install linuxcnc-uspace
thanks


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Re: [Emc-users] building for sim and rip

[grumpy--- via Emc-users]

On Mon, 8 Jul 2019, andy pugh wrote:


On Mon, 8 Jul 2019 at 18:35, grumpy--- via Emc-users
 wrote:


i am running debian stretch
i did not see any prebuilt packages for stretch and sim


"uspace" is the new "sim".

"uspace will work on either a preempt-RT kernel (and will declare
"Using POSIX realtime"  if you start LinuxCNC from the command line)
and also on a conventional kernel "POSIX non-realtme".

This is slightly more useful than the old pure-simulator as (as far as
I know) it is possible to drive parallel port pins with POSIX
non-realtime, though not with any timing guarantees.



i added to /etc/apt/sources.list

deb http://buildbot.linuxcnc.org/ stretch master-rtpreempt
deb-src http://buildbot.linuxcnc.org/ stretch master-rtpreempt

when i run "apt-get install linuxcnc-uspace" apt wants to install a new kernel
how is the best way to get linuxcnc-uspace and keep my curent kernel



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[Emc-users] building for sim and rip

[grumpy--- via Emc-users]

i am running debian stretch
i did not see any prebuilt packages for stretch and sim
using "http://linuxcnc.org/docs/master/html/code/building-linuxcnc.html; i 
built linuxcnc
when i start i run scripts/rip-environment and scripts/linuxcnc
seems to work ok untill i try to edit the tool table

couldn't read file "/usr/lib/tcltk/linuxcnc/tooledit.tcl": no such file or 
directory
while executing
"source /usr/lib/tcltk/linuxcnc/tooledit.tcl"
(file "/home/rray/git/linuxcnc-dev/bin/tooledit" line 2)

thanks for any pointers


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Re: [Emc-users] ... unexpected real time delay --> iptables: Permission denied (you must be root)

[grumpy--- via Emc-users]

On Tue, 23 Jul 2019, Mark Wendt wrote:


On Tue, Jul 23, 2019 at 11:45 AM Chris Albertson
 wrote:


1) DHCP can in fact be "static".   What you do is configure your DHCP
server to always assign the same IP to each physical device and/or make the
lease time really, really long.  DHCP adds zero overhead once the IP
address and other info is set.


What's the point?


machines can be setup remotely
a new machine somewhere connects to the network
the sys admin adjust the dhcp settings
configuration is complete
any time a network setting changes it is push out to all machines


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[Emc-users] Real-Time Linux on the Raspberry Pi

[grumpy--- via Emc-users]

i have seen messages on this list about running a real time kernel on a pi
has anyone tried this guys method
i have not and know nothing more than what this article states
https://www.get-edi.io/Real-Time-Linux-on-the-Raspberry-Pi/


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[Emc-users] pololu stepper driver

[grumpy--- via Emc-users]

does anyone have experience with this device
https://www.pololu.com/product/3730


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[Emc-users] rock pi 4b

[grumpy--- via Emc-users]

with all the interest in raspberry pi has anyone started foolin with this
https://www.youtube.com/watch?v=C4p9EpjA0ZM


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Re: [Emc-users] OT - simple motor wiring

[grumpy--- via Emc-users]

On Tue, 21 Jan 2020, Gene Heskett wrote:


On Tuesday 21 January 2020 00:46:46 Roland Jollivet wrote:


You can see the yellow wire bound with the others in the first pic.
I'm sure it's a coil wire.
Usually the frame wire is bolted to the ... frame.

You should measure the resistance of the two coils. They're quite
different. I'm not sure what the rule of thumb is on which is the
start winding, but it's out there.

Roland

On Mon, 20 Jan 2020 at 22:02, Peter Blodow  wrote:

But this motor comes from Japan and, not knowing anything else,
might very well be designed for the European market.
Peter

Am 20.01.2020 um 19:31 schrieb Dr. Andreas O. Lindner:

Hello, green-yellow is protected ground only in central Europe. In
US it


is a bare wire !


Just my 2 cents,
Andreas


Am 20.01.2020 um 18:48 schrieb Peter Blodow :

Isn't there something written on the green-yellow wire? In any
case:


don't connect any power to this wire, its PROTECTIVE GROUND!


Peter

Am 20.01.2020 um 18:21 schrieb grumpy--- via Emc-users:

thanks men
got it
neutral to black and blue
one side of capacitor to red
other side of capacitor to yellow
connect line to red or yellow


I think I've seen both ways.  Sometimes the raw power is the run winding
with the higher resistance and inductance, with the lower resistance cap
tuned winding actually taking more current because of the resonance, and
because of the cap, generates the magnetic phase difference that makes
it run. That is the first config I'd try, but I'd also bring it up at
half voltage from a powerstat to judge how hot it runs. It likely will
run in either config, but starting torque will suffer and it will run
hotter in the wrong config. Both the winding R and the inductance are
part of such a motors design.

One would be on much firmer footing if your meter can measure inductance,
then the capacitor should be in series with the coil having the least
inductance as that would generate the maximum phase difference.

Cheers, Gene Heskett



according to my handy little peak lcr40 meter
blue to yellow is 1.130H and 459.6 ohms
black to red is 507.1mH and 191.0 ohms


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[Emc-users] turning a rectangle on a lathe

[grumpy--- via Emc-users]

https://www.youtube.com/watch?v=yr0VVtuPAlE


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[Emc-users] ot - very neat

[grumpy--- via Emc-users]

https://www.youtube.com/watch?v=p_wk3q8jWcs


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Re: [Emc-users] X forwarding with linux-cnc

[grumpy--- via Emc-users]

On Sun, 19 Jan 2020, Chris Albertson wrote:


Yes, but checkout VNC as well.  Sometimes VNC can be faster.I think it
might depend on what kind of computer you have in from of you where the
physical display is. VNC is pretty good to exporting an entire desktop,
X11 forwarding for exploring one app's window.



check out xpra
it runs circles around vnc


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Re: [Emc-users] OT - simple motor wiring

[grumpy--- via Emc-users]

On Mon, 20 Jan 2020, Peter Blodow wrote:

Isn't there something written on the green-yellow wire? In any case: don't 
connect any power to this wire, its PROTECTIVE GROUND!


i can not see any writing on the yellow wire
my old vom shows none of the wires are connected to the frame


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Re: [Emc-users] OT - simple motor wiring

[grumpy--- via Emc-users]

thanks men
got it
neutral to black and blue
one side of capacitor to red
other side of capacitor to yellow
connect line to red or yellow


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[Emc-users] logan lathe for sale

[grumpy--- via Emc-users]

https://www.bidspotter.com/en-us/auction-catalogues/new-mill-capital/catalogue-id-bscnew10211/lot-9d6c99f2-7efe-4e0b-8396-ac28015886ea


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[Emc-users] ot: welders

[grumpy--- via Emc-users]

this list is home to a bunch of very sharp folks
and i don't intend to drag y'all too far off course
i am look'n for a welder
does anyone know of a good mail'n list for non-pro welders


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Re: [Emc-users] ot: welders

[grumpy--- via Emc-users]

On Mon, 14 Sep 2020, Mark Johnsen wrote:


I'd be interested in the list as well.  Would be nice to know what kind of
mat'l you want to weld and what type of welder you're looking for.

i'm retired
just look'n to weld steel at home
a stick welder
for about 20 years i was attached at the hip to a lincoln stovepipe
i've tried a couple of the cheap inverters and they are better than noth'n
just barely
i know have'n a motor-generator unit at home is out of the question
but surely something comes close




I recall we got an inexpensive Miller welder for the machine shop about 10
years ago and one of the guru-techs (ie years of fab experience) used it
and thought it was darn right excellent when compared to a more expensive
MIller (probably syncrowave).  At least when you looked at the price.
Others raved about it as well...  (I had no clue... haha).

I think it was
https://www.millerwelds.com/equipment/welders/tig-gtaw/diversion-180-tig-welder-m00337,
however, the unit I recall looked more like the $5k unit on the miller
website w/ the exception we definitely paid about 3K for the version we got
(and didn't get a 5k welder for 3k).  We probably paid about list price for
it...

That being said, there are other brands for much less $$.  I think I read
that everlast was a decent 'less expensive' welder and on amazon they have
several models.  However, I have not used one and you'd have to hear from
someone who knows better than I do.

Mark

On Mon, Sep 14, 2020 at 7:10 AM grumpy--- via Emc-users <
emc-users@lists.sourceforge.net> wrote:


this list is home to a bunch of very sharp folks
and i don't intend to drag y'all too far off course
i am look'n for a welder
does anyone know of a good mail'n list for non-pro welders


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Re: [Emc-users] ot: welders

[grumpy--- via Emc-users]

On Mon, 14 Sep 2020, Jon Elson wrote:


On 09/14/2020 10:42 AM, grumpy--- via Emc-users wrote:

i'm retired
just look'n to weld steel at home
a stick welder
for about 20 years i was attached at the hip to a lincoln stovepipe
i've tried a couple of the cheap inverters and they are better than noth'n
just barely
i know have'n a motor-generator unit at home is out of the question
but surely something comes close

I have done some stick welding, but the flux fumes really got to me.
I finally bought a Lincoln Square Wave TIG 250 on eBay and it has been 
fantastic.
I can now weld in the basement and nobody even knows I'm doing it. TIG is a 
lot
slower than stick, but you can actually see what you are doing without the 
cloud of flux smoke,

and you can weld aluminum and copper, too!

You can likely find a decent TIG machine that isn't too expensive, and give 
your lungs a break.


i've done my share of tig on stainless tubing
not very good on heavy material
where i worked was a plant that used ammonia refrigeration
my lungs were fried decades ago


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[Emc-users] anyone needs calipers

[grumpy--- via Emc-users]

https://www.bidspotter.com/en-us/auction-catalogues/bscci/catalogue-id-bscci10396/lot-9f16740e-b338-4552-bc54-ac1600eeafca


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Re: [Emc-users] driver for a DC motor for a BS-1.

[grumpy--- via Emc-users]

On Sun, 18 Oct 2020, John Dammeyer wrote:


Way back in 2003 I started a project to control the surplus tread mill motors I 
had acquired.  At that time I was still just casting parts for making my 
Gingery Lathe and thought about making my own DC Servo motor controller.

http://www.autoartisans.com/MotorDrives/MOTOR1-5.JPG

The first prototype had a bunch of problems and then regular paying work took 
over, I needed the bench space and never revived the project.
http://www.autoartisans.com/MotorDrives/REVA0059.JPG

The controller was the MC33030

http://www.autoartisans.com/MotorDrives/MC33030-D.pdf

Knowing what I know now I'd never use this device but back then...


i have a 1 hp treadmill motor i need a controller for
in view of you past experience what would you use now


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[Emc-users] bradford lathe for sale

[grumpy--- via Emc-users]

https://www.bidspotter.com/en-us/auction-catalogues/heritage-global-partners/catalogue-id-herita10131/lot-ca287d1e-1e45-4d0a-af63-ac13000453ab


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[Emc-users] south bend lathe for sale

[grumpy--- via Emc-users]

https://www.bidspotter.com/en-us/auction-catalogues/heritage-global-partners/catalogue-id-herita10131/lot-bd475d2f-aa77-4c53-bbf7-ac13000453ab


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Re: [Emc-users] freecad, latest, starter tut?

[grumpy--- via Emc-users]

On Sat, 19 Sep 2020, Gene Heskett wrote:


Greetings all;

I am determined to create the adapter to bolt or clamp to the worm
bearing boss stick out of this BS-1 in hope that I will eventually get
that encoded motor I ordered.  So I went out and took some measurements.

The diameter of where it will clamp to is 28mm.
The diameter of the worm shaft sticking out of that is 19mm.
And this 19mm shaft is double flatted, 10mm across the flats.

Now, where do I find a freecad tut that will allow me to create a ring
that will clamp or grub screw to the 28mm piece, and flare out to about
50mm diameter to mount this worm drive and motor when it arrives and I
can take some measurements? I have managed to create a starter cylinder
but haven't found where to set its length or or diameter. Rank, brand
new bee here IOW.  And its solid rod, not a ring, so is probably a throw
away at this point.

The youtube videos are confusing because they are outdated. These 2 seems
to redefine the phrase "moveing target".

Since I've installed the AppImages of both freecad and cura, 2 weeks ago,
both have been updated several times, and I have added shortname links
to the AppImages, in general making them no-brainers to run. But I do
have to fix the ln's when they update.


not sure if this'll help or not
in the top row there is a drop down, select "part"
in the second row click on the cylinder
in the left top panel select the word "cylinder"
in the left lower panel adjust the properties
in the second row click on the cylinder again
adjust the diameter of the second cylinder to be smaller than the first cylinder
in the left top panel select the word "cylinder"
in the left top panel hold the ctrl key and select the word "cylinder001"
in the third row of the icons click on the third one, tool tip "Make a cut of two 
shapes"
now you have a tube


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Re: [Emc-users] freecad, latest, starter tut?

[grumpy--- via Emc-users]

On Sat, 19 Sep 2020, Gene Heskett wrote:


On Saturday 19 September 2020 12:06:30 grumpy--- via Emc-users wrote:


On Sat, 19 Sep 2020, Gene Heskett wrote:

Greetings all;

I am determined to create the adapter to bolt or clamp to the worm
bearing boss stick out of this BS-1 in hope that I will eventually
get that encoded motor I ordered.  So I went out and took some
measurements.

The diameter of where it will clamp to is 28mm.
The diameter of the worm shaft sticking out of that is 19mm.
And this 19mm shaft is double flatted, 10mm across the flats.

Now, where do I find a freecad tut that will allow me to create a
ring that will clamp or grub screw to the 28mm piece, and flare out
to about 50mm diameter to mount this worm drive and motor when it
arrives and I can take some measurements? I have managed to create a
starter cylinder but haven't found where to set its length or or
diameter. Rank, brand new bee here IOW.  And its solid rod, not a
ring, so is probably a throw away at this point.

The youtube videos are confusing because they are outdated. These 2
seems to redefine the phrase "moveing target".

Since I've installed the AppImages of both freecad and cura, 2 weeks
ago, both have been updated several times, and I have added
shortname links to the AppImages, in general making them no-brainers
to run. But I do have to fix the ln's when they update.


not sure if this'll help or not
in the top row there is a drop down, select "part"
in the second row click on the cylinder
in the left top panel select the word "cylinder"
in the left lower panel adjust the properties
in the second row click on the cylinder again
adjust the diameter of the second cylinder to be smaller than the
first cylinder in the left top panel select the word "cylinder"
in the left top panel hold the ctrl key and select the word
"cylinder001" in the third row of the icons click on the third one,
tool tip "Make a cut of two shapes" now you have a tube


Now I've a different problem. It went thru all the motions of exporting
an .ngc but didn't generate the file, all without any error.  Do I need
another plugin?

In fact, the only way it will create ANY kind of a file is as *.FCstd's.

WTH?


i have used freecad enough to be a middle'n noib
this is how i do it
save my .fcstd so i can come back and re-edit
in the top row select "Mesh design" in the drop down
in the left top panel select your design, "Cut"
in the top menu click "Meshes"
select "Create mesh from shape"
select "Standard"
select "OK"
in left top panel click on "Cut (Meshed)"
right click and select "Export mesh"
this creates a .stl
then use cura to slice


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Re: [Emc-users] missing feature of openscad

[grumpy--- via Emc-users]

On Tue, 2 Jun 2020, Dave Matthews wrote:


On Tue, Jun 2, 2020 at 11:39 AM Gene Heskett  wrote:


On Tuesday 02 June 2020 05:57:59 Chris Albertson wrote:


Docs?  The entire printer is open source.


No it is NOT!  The Cura slicer is windows only. And there will be a
language barrier that prevents a request for that source code from ever
being replied to.  Been there, done that too many times already.


When I go to the Cura downloads page it lists - Ultimaker Cura 4.6.1
Linux, 64 bit

https://ultimaker.com/software/ultimaker-cura



i've been using cura on linux for several years with no problems


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Re: [Emc-users] freecad, latest, starter tut?

[grumpy--- via Emc-users]

On Sun, 20 Sep 2020, Bruce Layne wrote:


I'm not a professional draftsman.? I was initially intimidated by
FreeCAD, as many people naturally are.? I knew when I was glomming parts
together using geometric primitives that I wasn't doing *real* CAD, but
that inelegant method allowed me to produce simple usable parts.? Some
complex parts need to be drawn in 2D and lofted or rotated, and that's
what I do when I need a complex shape, but if I was drawing Gene's
simple part in FreeCAD it's much faster to create two cylinders and
subtract one from the other, and it would be much faster and easier for
Gene to get the part he wants that way instead of trying to talk him
through using Draft mode to draw 2D shapes (which requires selecting
working planes, etc.) and then switching to Part mode to extrude the
shape into 3D.

I totally agree that restricting ourselves to simple 3D shapes would
severely limit our capabilities, but for simple 3D shapes it's easier in
FreeCAD to stay in the 3D Part environment and simply create the
parametric part I need.? The notion of drawing 2D parts and then lofting
or rotating them as THE way to work seems to have its origins in the
days when AutoCAD was trying to embrace 3D CAD but was barking up the
wrong tree because they were adding that capability to their legacy 2D CAD.

I assume Fusion360 and Solidworks make it much easier to work in 2D and
3D.? It's not terribly difficult in FreeCAD, but I find it cumbersome to
switch gears.? If I want a rectangular plate with some holes or a disk
or tube, it's much easier to use the 3D primitives.? It's certainly much
easier to talk a newbie through the 3D process than try to convince them
to draw 2D parts and then switch to 3D to extrude them, which is similar
to telling then to use a 2D CAD program to draw their part and then
export that to a DXF and import that into a separate program to loft the
part and create the G code.

And it IS surprising how complex parts can be when constructed using 3D
primitives.? Most of us aren't doing a lot of 3D surface machining for
injection molds or art objects.? Most of us are cranking out simple
parts that are readily machinable using 2.5D methods.? Gene's part is on
the simple side but is a good example.? Designing parts from 3D
primitives is quite amenable to the types of parts that hobbyists are
usually machining.? I don't have a five axis machining center in my
basement shop, so I had no need for complex 3D CAD until I had a 3D
printer that was much less restricted in the part geometry it could
create.? In fact, for the simple parts I machine on the mill, router and
lathes, I prefer to write my own G code from scratch rather than using
CAD and CAM.


an example of some of the different methods in freecad are demonstrated in the 
link below
i have used the "Part Workbench" method to create many different threads
https://wiki.freecadweb.org/Thread_for_Screw_Tutorial


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Re: [Emc-users] found a harmonic drive set of .stl's on thingiverse

[grumpy--- via Emc-users]

gene, how is this project come'n
i keep look'n for pictures on your web site


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Re: [Emc-users] found a harmonic drive set of .stl's on thingiverse

[grumpy--- via Emc-users]

On Wed, 12 Aug 2020, Gene Heskett wrote:


On Wednesday 12 August 2020 12:45:14 grumpy--- via Emc-users wrote:


gene, how is this project come'n
i keep look'n for pictures on your web site


That will happen eventually but progress was slow when I started out with
a printer that was totally uncalibrated OOTB. So once I got that figured
out, the extruder was only feeding about 13mm of plastic for a 100mm
feed. Then it was make flexgears creeping up on the right size to
actually fit in the main bearing, you have to make it at least 3 red
hairs small because the printer bleeds that much.  So about 8 of them
later, I finally have 3 that fit.  Then the size of the internal spline
is too large for that sized gear, and I just now took the 2nd good one
off the printer and may make the last one at another .05 less on the
printers xy scales as there is still 15-20 thou of clearance between the
teeth at maximum pullin on the sides of the bearing carrier. That will
be added to by the fact that the bearing carrier is carrying 6 bearings
in groups of 3. So I just reduced the scale to 79.85 from 79.9 as I
believe there is room yet to tighten that up another few thou.  The
closer that is, the less actual flexing the flexgear has to do and it
won't fatigue and break so quick.

I have already made some bearing carriers, but may have stretched them
too much before I found the flexgears were too big for the bearings.  So
that fit has not been pronounced as good yet.

The idea then is to scale the bearing carrier for a teeny bit of
overpush, flexing the houseing and circular spline a thou or 4 for a
break-in wear clearance, keeping it backlash free a bit longer.

The third one, if it has the cajones for the job, will be turning the
worm of a chinese B indexing head clone, not a big job but hard to
do if its being driven under cutting loads as in making spiral or hypoid
gears.  I have another 100/1 worm drive gearbox with a 3NM 3 phase motor
on it that will get used there if this plastic isn't up to that job. But
I've been messing with this instead of makeing the shaft couplings that
will take. Making 3 of this drive cuz the first 2 will eventually be
connecting the stellarium program to my now elderly Meade DS-10
telescope, a 10" Newtonian design.  That will take another rpi4 and some
interfacing.

Taking inventory, I still need a bag of 4mm nuts, and a smaller bag of
4mm square nuts for the bearing carriers.  And suitable grease, all of
which seem to be of Chinese only source, and another 6 weeks away.

Stay well and safe Grumpy. From one grumpy, long retired old fart to
another.

Cheers, Gene Heskett


it sounds very cool
post a link to the thingiverse files
you should put up some pics of what you've got so far
a pictorial cronical of your journey
even the bad stuf is a lesson for us beginners


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[Emc-users] ot: need a motor control switch

[grumpy--- via Emc-users]

i have a small 12v dc gearmotor rated at 50 watts
the motor will be run at full voltage forward and reverse
i need a switch for this that is electrically controllable
something like a double pole double throw relay and a seperate double pole 
single throw relay
or a double pole three position with an open center
any suggestions


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[Emc-users] OT: getting an auction purchase shipped

[grumpy--- via Emc-users]

i spotted an item on bitspotter.com that i would like to bit on
if i where to win the auction how do i go about getting it shipped


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Re: [Emc-users] LinuxCNC 3Dprinting

[grumpy--- via Emc-users]

I bought a QIDI Shadow 5.5S a few weeks ago for US$289


i see it is available now for $259.00 and free shipping
what slicing software is needed
does it run under linux
is the manual available
i would like to read up on this


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[Emc-users] pot for vfd

[grumpy--- via Emc-users]

a few years ago i switched my lathe to a 3 phase motor and vfd
i added a 10k pot to the lathe panel
recently the motor speed started fluctuating
i switched the vfd back to using the pot on it's front panel
no more fluctuation
can someone recommend a 10k pot that will handle the vibration


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Re: [Emc-users] can i hook this to my cnc mill

[grumpy--- via Emc-users]

i wonder what happens it you sneeze


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[Emc-users] can i hook this to my cnc mill

[grumpy--- via Emc-users]

https://venturebeat.com/2020/12/07/nextmind-real-time-brain-computer-interface-dev-kit/


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Re: [Emc-users] ender 3 and low quality sprockets

[grumpy--- via Emc-users]

On Wed, 11 Nov 2020, Gene Heskett wrote:


Greetings 3d printer X-spurts;

I just downloaded the .stl kit for a nema 17 powered, gt2 belt driven
reduction gear.


if i may ask, what did you download


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Re: [Emc-users] Code of Conduct

[grumpy via Emc-users]

>> Bullshit.  It's a sign that someone(s) wants to create political
>> division and strife

>No, I think that we can be 100% sure that that was never Jeff's intention.

We do not know Jeff's intent since has never commented on this subject.


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Re: [Emc-users] Harmonic Drive

[grumpy via Emc-users]

January 3, 2022 9:54:10 AM CET John Dammeyer  wrote:
For fun I created Todd's version with 0.5module gears.  The OD of the assembly
is now 60mm compared to 150mm.   It would now be possible to choose a far east
harmonic drive tapered roller assembly to hold the driven gear in place. 
Although they are expensive.  

Not sure what type of bearings, if any would be used for the planetary gear
clusters.  I suppose one could press in bronze sleeves.  I guess it all depends
on the duty cycle and target application.  If it's a 6 axis robot arm used for
tool changing and placement/removal of milled parts then it's not running
continuously.  Might well for the home or small shop be more than adequate.

This example still has 67.333:1 reduction but if the fit is well set then
the backlash is essentially zero which is different from normal planetary
reduction drives.   Not sure how important that is for a 6 axis robot arm.

In either case, using a 4th axis to create all three spur gears at the same
time (one set of 40T and one set of 41 T) and then some sort of
broaching/indexing to create the two ring gears the real issue is the outer
bearing of the 101T output ring gear.  But overall not that difficult to create
once you have the 0.5 module shaper style cutter.

John

Where can I find more info about Todd's planetary drive.
It looks very familiar.
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Re: [Emc-users] live center

[grumpy via Emc-users]

December 9, 2021 8:28:26 PM CET andrew beck  
wrote:First off I don't think you can change the shank.

I need a more taper 4 centre for my cnc lathe.

If you want to sell it.

I'm also not sure what they are worth.  But we could look it up I guess.

On Fri, 10 Dec 2021, 07:39 grumpy via Emc-users, <
emc-users@lists.sourceforge.net> wrote:

>
> I bought a pallet of miscellaneous items.
> In it there is a Point Tech 4BNL30 live center.
> This is a beefy piece of hardware.
> My lathe takes a MT3 so I can't use it.
>
> It is in the original box in the original wrapper.
> I can't see any sign it was ever used.
> Does anyone know what this is worth?
> I have a cheap live center and could use a good one.
> Would anyone be open to trade?
> Would I be able to change the shank?

The only reference I found that is in english is on amazon for $285.
And shipping from southern USA.

https://www.amazon.com/GG-High-Speed-Center-Extended/dp/B07TB55JZ1?th=1
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[Emc-users] live center

[grumpy via Emc-users]

I bought a pallet of miscellaneous items.
In it there is a Point Tech 4BNL30 live center.
This is a beefy piece of hardware.
My lathe takes a MT3 so I can't use it.

It is in the original box in the original wrapper.
I can't see any sign it was ever used.
Does anyone know what this is worth?
I have a cheap live center and could use a good one.
Would anyone be open to trade?
Would I be able to change the shank?
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Re: [Emc-users] Harmonic Drive

[grumpy via Emc-users]

this man's work might be helpful
https://www.youtube.com/c/Skyentific
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Re: [Emc-users] The Code Of Conduct Fait Accompli

[grumpy via Emc-users]

> 
> From: Valerio Bellizzomi 
> Sent: Thu Jul 22 11:35:44 CEST 2021
> To: 
> Subject: Re: [Emc-users] The Code Of Conduct Fait Accompli
> 
> 
> I am making a big effort to understand why people is so adverse to
> rules. Every project on sourceforge/github has to follow rules of the
> site, and some projects have their own CoC.
> If you agreed to behave correctly before, the CoC should not affect
> you, unless you want to misbehave now.
> 
> 
> 
> On Thu, 2021-07-22 at 03:02 -0400, Bruce Layne wrote:
> > The "discussion" is apparently over and we still have the Code of
> > Conduct.
> > 
> > https://linuxcnc.org/CODE_OF_CONDUCT
> > 
> > It wasn't much of a discussion.  Questions were asked but there were
> > no 
> > meaningful answers.
> > 
> > At the risk of offending any programmers in the LinuxCNC community
> > by 
> > appropriating programmer culture, here is my pseudo code for the 
> > LinuxCNC Code of Conduct Fait Accompli:
> > 
> > 
> > 01  IMPOSE CODE OF CONDUCT ON LINUXCNC COMMUNITY
> > 02  IF COMPLAINTS > 0 THEN GOTO 02
> > 03  END
> > 
> > 
> > All of the complaints by those who didn't feel a code of conduct was 
> > needed have apparently now concluded and those who wanted a code of 
> > conduct to regulate other people's behavior have won without ever 
> > engaging on the issues... without ever justifying why their code of 
> > conduct was needed, without explaining what event might have 
> > precipitated the rules imposed on others, etc.
> > 
> > There was no need to explain who would decide what is
> > "disinformation" 
> > or "conspiracy theories", or who would decide what is "other conduct 
> > which could reasonably be considered inappropriate", or who would
> > decide 
> > what is "inappropriate language" or "inappropriate images".  There
> > was 
> > no need to explain why the Code of Conduct was required when there
> > were 
> > no hostile comments on this group until the Code of Conduct caused
> > all 
> > of the recent animosity, resulting in exactly what it purported to
> > prevent.
> > 
> > One of the things I liked about LinuxCNC was that it was a community 
> > effort.  Certainly there are a core group of contributors (greatly 
> > appreciated), but nobody was perceived as being in charge.  There was
> > a 
> > spontaneous order arising from mutual cooperation.  This open source 
> > community functioned very well without a lot of rules, and certainly 
> > without any rulers.  I no longer feel that way.  At best, rather
> > than 
> > everyone behaving with courtesy and respect toward others because
> > it's 
> > the right thing to do, it now feels like coerced behavior.  I now
> > feel 
> > that this community is under the rule of unelected and as yet
> > unnamed 
> > rulers.
> > 
> > The process was so opaque that I still don't know if one person 
> > unilaterally enacted the Code of Conduct, or was there some
> > oligarchy 
> > that made the decision after a secret discussion?
> > 
> > When someone violates one of the subjective rules in the new Code of 
> > Conduct, will we then learn who the rulers are... or at least who
> > the 
> > enforcers are?  Or will dissidents be quietly disappeared in the
> > middle 
> > of the night?
> > 
> > An open source community that has always operated on mutual consent
> > is 
> > now operating under dictatorial decree with all objections ignored
> > and 
> > unanswered.  I think that's very sad.
> > 
> > I don't like the subjective rules in the Code of Conduct.  They seem 
> > politically motivated and the vague rules can be selectively
> > enforced.  
> > I also feel that the Code of Conduct will cause problems rather than 
> > preventing problems.  That concern seems warranted based on the
> > hostile 
> > arguments we've already suffered as a direct result of the Code of 
> > Conduct.  Mostly, I didn't like the way the Code of Conduct was 
> > unilaterally decreed without discussion, and when a few people tried
> > to 
> > initiate a discussion, they were ignored by the person who posted
> > the 
> > Code of Conduct.  I'm left with the feeling that there wasn't any 
> > explanation for why the Code of Conduct was needed because there
> > wasn't 
> > an actual need to regulate the behavior of a group that has been
> > self 
> > regulated for decades.  The Code of Conduct couldn't be justified,
> > so 
> > there was no effort to justify it.  If there was an actual need, why 
> > wasn't there a discussion that led to community standards that were 
> > established by the community?  That would have been a far less 
> > contentious process than someone posting the new Code of Conduct for 
> > everyone else to follow without prior discussion and without any 
> > community consensus.

It's about changing horses in midstream.
When we joined this group there were certain rules we agreed to.
Now one person decided it's their way or the highway.
Jeff will ban you from the list if he doesn't like your post.