A friend of mine has run hydraulics that way.
What you say makes a lot of sense for the model trains too. My little PWM DC
speed controller was set above 20kHz to prevent audible noise. But that's a
lot different from 60Hz that would, as you say, introduce vibration to overcome
static
This idea is still in use today with proportional hydraulic valves; you use a
PWM frequency that is low enough to induce a slight continuous vibration in the
valve, to overcome stiction.
> On Apr 10, 2022, at 6:49 PM, Chris Albertson
> wrote:
>
> I'd say this thing was a vibrator with a DC
Beat me to it. I was just about to say the exact same thing.
What comes around goes around.
Mark
On 4/10/22 05:28, Gregg Eshelman via Emc-users wrote:
In other words the person who designed that created a pulse width modulation
motor controller without calling it that.
On Saturday, April
In other words the person who designed that created a pulse width modulation
motor controller without calling it that.
On Saturday, April 9, 2022, 08:18:17 PM MDT, John Dammeyer
wrote:
Really nothing to do with LCNC or even automation.
I've been cleaning out old shelves and I have piles
Clearly OT!
Indeed electronics have come a long ways since then.
I still have my Dad's 200 w-sec strobe. Oil filled caps from Edmund
Salvage dumped to the flash tube with a thrytron. Later vintage an
electronic ignition, nice toroid 6 v to 400 v converter and a decent SCR
for my PV544
On Sun, 10 Apr 2022 at 18:29, Danny Miller wrote:
>
> Nothing to unplug- it's a built-in RS232 DB9. Nothing enumerates across it.
https://superuser.com/questions/131044/how-do-i-know-which-dev-ttys-is-my-serial-port
suggests "cat /proc/tty/driver/serial" will tell you which ttyS* has
hardware
That brings back memories. The fun of being at Grandma and Grandpa's was
the Popular Mechanics and Popular Science magazines I could page thru when
visiting.
I remember all the pages in the back of the magazine where people were
trying to sell things, I always wanted a VW Bug replica car
Cool!
On a side note, I just finished listening to Walter Isaacson's biography on
Leonardo Da Vinci and wanted to inform you that you're in good company
because he had serious issues finishing projects. Of course, humanity got
the worse end of that by him not publishing his work. But, when you
This one page showing the expected waveform was too big to attach so I've put
it here as a JPG:
http://www.autoartisans.com/MotorDrives/PulsePower3.jpg
I agree it's a PWM motor controller but without a filter on the output. (well
actually the motor inductance acts as a filter of course)
Nothing to unplug- it's a built-in RS232 DB9. Nothing enumerates across it.
I'm baffled where to go. I see there's a port /ttyS0 from the command line.
Launching LinuxCNC from the command line shows text warnings about
Modbus timing out. It's just not communicating. I played with the
In keeping with the off topic theme and since you mentioned CD ignition...
http://www.autoartisans.com/images/igf200.jpg
This one is CD ignition (with that 350V step up) for one coil per cylinder and
multi-point sequential fuel injection for Honda VTEC 1500CC engines used in
homebuilt aircraft
Plug in a loop back plug (pins 2 and 3 connected) and run any
terminal emulator ("screen", and Arduino IDE serial monitor are
two convenient ones available on Linux) to see if you get back
what you type. That will verify the port works and that you are
addressing the correct one. Then check if
I remember a similar model railroad throttle for DC trains published in
Model Railroader Magazine called the TAT IV. I was just a kid and tried
building one. Back then you could make thing for less than what they cost
assembled. My first build was a total failure. A second attempt using a kit
that
In robotics, DC motors are always the hardest to control at the slowest
speeds.The root of the problem applies to model trains too. The
coefficient of friction is different for static friction than for
moving friction.So the sleeve bearing in a motor takes a certain torque
to break free,
14 matches
Mail list logo
