I'm starting to use larger quantities of filament in a small but growing
3D print farm. I'd love to find someplace where I could buy 10-100 kg
of filament per order and be assured of good quality and good pricing,
but I've been surprised that my initial investigations have been mostly
fruitless.
> The white pla is not the same stuff as the black, by a hell of a long row
of apple trees. Where the black is a brittle as can be cold, the white
is much more forgiving, . . .
Back in about 1977, I got told the black plastic was the first that was
recycled.
The people doing the recycling
> From: dave engvall [mailto:dengv...@charter.net]
> Ah, John,
> In the words of way too many math professors, "It is obvious that ." .
Hear hear!
Having said that though I must admit I probably use more math than most. About
11 years ago I had to look up Airy Disk effect and then do the
Ah, John,
In the words of way too many math professors, "It is obvious that ." .
On 8/19/20 7:12 PM, John Dammeyer wrote:
My computer science degree required 4 terms of calculus, 2 terms of linear
algebra, 2 terms of differential equations, 4 terms of physics and 2 terms of
statistics. I
Could build a crossed gantry printer
https://hackaday.com/2020/08/19/re-imagining-the-crossed-gantry-3d-printer/
Toolchanging between plastic extruder and milling tool for high surface
precision with FDM printing
https://hackaday.com/2020/08/18/e3d-teaches-additive-machines-how-to-subtract/
On Wednesday 19 August 2020 19:17:08 Gene Heskett wrote:
Well, I'm back, hat in hand.
The white pla is not the same stuff as the black, by a hell of a long row
of apple trees. Where the black is a brittle as can be cold, the white
is much more forgiving, AND it sticks to the glass about 1000
I was not suggesting a cycloidal drive for your application. You need
something that can't be back driven and harmonic is best. My comment was
that soon you will know more than the designer of this thing. I did that
with printed drone chassis. I made a bunch then broke them and made more.
My computer science degree required 4 terms of calculus, 2 terms of linear
algebra, 2 terms of differential equations, 4 terms of physics and 2 terms of
statistics. I think that was all of it. I also took a nuclear physics course
that was quite interesting. The diff equations were part of
Yes, If this is a theoretical discussion then at the end of all the chains
of reasoning it all comes to "mutually observed event". If this is just
engineering then it comes down to "the delay is so fast no one cares".
My background is computer science. Computer science is a mash-up of
Thank you guys for all the replies :)
I'll give them a try and see how it goes.
El mié., 19 ago. 2020 a las 9:54, Todd Zuercher ()
escribió:
> I think I'd prefer a model with a pressure guage (but you could always add
> one in-line after the pump). And for Linuxcnc I'd prefer one without the
>
> From: John Dammeyer [mailto:jo...@autoartisans.com]
> I was just reading a few weeks ago in the book "Sapiens" that the early
> explorers set up an experiment where they would observe an
> astronomical event from both England and the South Pacific. Something about
> either time or
On Wednesday 19 August 2020 17:52:39 Chris Albertson wrote:
> I suspect that in the end you will need to design your own reduction
> drive from a clean sheet of paper using what you learn from building
> this. I think I'd make the gear teeth larger so that small printing
> errors don't matter.
>
I suspect that in the end you will need to design your own reduction drive
from a clean sheet of paper using what you learn from building this. I
think I'd make the gear teeth larger so that small printing errors don't
matter.
My plan with my plastic printed milling machine parts is to do a
I was just reading a few weeks ago in the book "Sapiens" that the early
explorers set up an experiment where they would observe an astronomical event
from both England and the South Pacific. Something about either time or
position.
I think it was Cook who was exploring at that point. I'll
> -Original Message-
> From: N [mailto:nicklas.karlsso...@gmail.com]
> Sent: August-19-20 1:46 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] OT: Synchronised motion using RS485/CAN bus motors
>
> > The usual technical solution for exact synchronization where
I think the question was intended to be more theoretical and asks about
"exactly" synchronizing commands. The LinuxCNC/SPI solution is not
that. SPI works only because it is so fast that the error in
synchronization is tiny and goes unnoticed.
Here is a harder problem. Let's say I am in
Quite often used a lot lower speed than maximum on CAN bus, in some cases cable
is long and while in other cases an ordinary cable not optimized for maximum
speed is used. Sometimes only slow communication is needed so possibility to
reduce speed to accomodate these case are good.
> Yes, that
> The usual technical solution for exact synchronization where commands must
> go over a shared media is to time-tag the commands with the time when the
> command is to be executed then send the commend in advance of that time.
> On a fast bus like CAN you only have to send the command a few
>
Yes, that works in your case where the cable is short. But what if this
were a CAN bus in a very noisy environment. So noisy that only slow speed
could work. Image an electric car and you want to keep the from and rear
traction motors "balanced" so they don't work in opposition and you care
> Have a read on the manuals for the Yaskawa Legend 01 or 04
>
> It uses serial at 9600 !!! to command the drive. (RS232 serial, or
> ethernet interface)
> The trick it uses is to send only new, relevant data, and not fixed packets
Good enough for configuration but not coordinated movement in
Have a read on the manuals for the Yaskawa Legend 01 or 04
It uses serial at 9600 !!! to command the drive. (RS232 serial, or
ethernet interface)
The trick it uses is to send only new, relevant data, and not fixed packets
Roland
On Wed, 19 Aug 2020 at 01:31, Frank Tkalcevic
wrote:
> An off
The usual technical solution for exact synchronization where commands must
go over a shared media is to time-tag the commands with the time when the
command is to be executed then send the commend in advance of that time.
On a fast bus like CAN you only have to send the command a few
milliseconds
> > From: Frank Tkalcevic [mailto:fr...@franksworkshop.com.au]
> > > You subject line says RS485/CAN which are dramatically different from the
> > SPI based synchronous clocked serial interfaces. Even RS485 and CAN are
> > dramatically different.
> >
> > Thanks for the replies...
> >
> > The
I bought CAT 5 cables to Mesa when I ordered the boards. If I'm not
mistaken CAT 6 is a good option too recommended by Mesa.
They work flawlessly.
Leonardo Marsaglia
El mié., 19 ago. 2020 15:39, Viesturs Lācis
escribió:
> Hello!
>
> Just a quick question about requirements for cables between
On Wed, 19 Aug 2020, Viesturs L?cis wrote:
Date: Wed, 19 Aug 2020 21:36:55 +0300
From: "[UTF-8] Viesturs L?cis"
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: [Emc-users] What cables between 7i44 and 7i70/7i71
Hello!
Just a quick question
On Wed, 19 Aug 2020, Thaddeus Waldner wrote:
Date: Wed, 19 Aug 2020 13:04:54 -0500
From: Thaddeus Waldner
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] 7i73 Lagging jog key
Can someone define a good way to test the keypad
On Wednesday 19 August 2020 14:04:54 Thaddeus Waldner wrote:
> Can someone define a good way to test the keypad scan signals? I put a
> scope on a circuit and it appears that the signals stands out clearly
> from the noise. I don’t know what the switch thresholds are so the
> noise could still be
Hello!
Just a quick question about requirements for cables between 7i44 and
7i70 or 7i71 boards. Are there any special requirements or can I use
usual CAT5 LAN cables? Is there anything special about pinout? I
recall that there are "normal" LAN cables and there are "crossover"
cables...
Viesturs
I wonder if there is some aggressive switch de-bounce happening. Without
looking at your hal file, I'd bet there is a software debounce. If so it
has to wait until it sees a steady-state on the pin for some period of
time. Any random noise above some threshold would re-set the waiting time.
On Wednesday 19 August 2020 12:09:05 Gene Heskett wrote:
> On Wednesday 19 August 2020 10:25:14 Greg Bernard wrote:
> > Most hardware stores carry silicone grease for o-rings in the
> > plumbing section. I'd be willing to bet it would work just fine for
> > your purpose.
>
> Thats similar to
On Wed, 19 Aug 2020 at 19:07, Thaddeus Waldner wrote:
> Could unused pins be an issue?
I have seen unused pins charge up and carry a signal into the next pin
in the multiplexer, in multiplexed ADC.
But whether that might be a problem here would need PCWs expertise.
--
atp
"A motorcycle is a
Can someone define a good way to test the keypad scan signals? I put a scope on
a circuit and it appears that the signals stands out clearly from the noise. I
don’t know what the switch thresholds are so the noise could still be enough to
cause issues. Setting the scope trigger voltage to about
On Wednesday 19 August 2020 10:25:14 Greg Bernard wrote:
> Most hardware stores carry silicone grease for o-rings in the plumbing
> section. I'd be willing to bet it would work just fine for your
> purpose.
>
Thats similar to DC-4, and I have some of that but its 60 yo. "Borrowed"
it while
On Wednesday 19 August 2020 01:53:13 Gregg Eshelman via Emc-users wrote:
> More perimeters = more strength in FDM printing. For rigid plastics
> like PLA that also increases stiffness. Several years ago, Benelli was
> designing a new auto loading shotgun and they had a problem with part
> of the
Most hardware stores carry silicone grease for o-rings in the plumbing
section. I'd be willing to bet it would work just fine for your purpose.
On Wed, Aug 19, 2020, 5:02 AM Gene Heskett wrote:
> On Wednesday 19 August 2020 00:19:40 Gene Heskett wrote:
>
> > On Tuesday 18 August 2020 20:30:45
I think I'd prefer a model with a pressure guage (but you could always add one
in-line after the pump). And for Linuxcnc I'd prefer one without the timer
features and do the timing control in Linuxcnc.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone:
On Wednesday 19 August 2020 00:19:40 Gene Heskett wrote:
> On Tuesday 18 August 2020 20:30:45 Gene Heskett wrote:
> > On Tuesday 18 August 2020 18:50:22 Frank Tkalcevic wrote:
> > > > the middle of a now thicker and nuch denser 6 wall build. cura
> > > > settings are for 6 line walls, 15 ipm and
37 matches
Mail list logo
