i'd still be leery of using a servo for steering (unless someone is using
an off the shelf r/c vehicle).
i did see this:
http://www.servocity.com/html/vertical_shaft_worm_drive_gear.html
i'll have to see how it might compare to the wiper motor that currently
turns the turret as it's repla
This site has hacked and externally geared servo setups.
http://www.servocity.com/html/robotzone_servos.html?no_redirect=true
Look around the site for many other solutions.
Mike B
> On Mar 30, 2014, at 9:03 PM, odysseyslipw...@aol.com wrote:
>
> lol, that is how i was designing it - use the bel
lol, that is how i was designing it - use the bell crank (if that's what
they are calling that part in the center) to act as a buffer (of sorts) and
to increase the throw/torque just a bit. that and with using ball link ends
it'll help smooth things out (specially when in motion) the rest of
That must be why the concept is used by most cars, RC racing or otherwise;
its a conspiracy by Futaba to sell replacement gears...
Look up bell crank steering. Its mechanically simple, resists bump steer
very well and keeps the wear off your servos.
Heres a great picture of the implementation:
h
it is possible not very practical as it'll put some serious strain on the
servo and gears
chris
In a message dated 3/30/2014 5:17:12 P.M. Eastern Daylight Time,
panthergol...@gmail.com writes:
Unfortunately its more complicated than that... for example, how long are
the steering arms (
Unfortunately its more complicated than that... for example, how long are
the steering arms (im assuming your using some variant of Ackerman
steering)? Even the weakest servo with a seriously long lever could give
some harsh torque...
On Sun, Mar 30, 2014 at 5:07 PM, wrote:
> 8" - 10" wheels a
8" - 10" wheels and aprox 50 - 100lbs and the ability to turn the wheels
while sitting still
In a message dated 3/30/2014 5:06:05 P.M. Eastern Daylight Time,
panthergol...@gmail.com writes:
It depends on your specific needs, which in turn requires doing math...
On Sun, Mar 30, 2014 at
It depends on your specific needs, which in turn requires doing math...
On Sun, Mar 30, 2014 at 5:03 PM, wrote:
> i started looking at the (big/jumbo) servos but i just don't think
> they'll be big/strong enough to handle anything i'm doodling or anyone else
> would build in larger scales.
>
>
i started looking at the (big/jumbo) servos but i just don't think they'll
be big/strong enough to handle anything i'm doodling or anyone else would
build in larger scales.
In a message dated 3/26/2014 11:05:36 A.M. Eastern Daylight Time,
panthergol...@gmail.com writes:
You can for ~ 3
Nice video explaining servo's and steppers.
https://www.youtube.com/watch?v=5thxBgew7N0#t=996
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a person such as myself would most likely go for the servo solution vs
trying to figure out the separate goodies placed before them to do the same job
chris
In a message dated 3/26/2014 2:15:57 P.M. Eastern Daylight Time,
panthergol...@gmail.com writes:
A servo would probably be simpler
interesting, i will have to take a look
chris
In a message dated 3/26/2014 11:05:36 A.M. Eastern Daylight Time,
panthergol...@gmail.com writes:
You can for ~ 30$ on _hobbyking.com_ (http://hobbyking.com/) buy servos
with 30 to 40 kgcm of torque; the one i got for my turret zenith has
thanks for the links Steve, i'll look at them later tonight when i get back
online again.
i was looking at some threads on where some where talking about using wiper
motors and hacking servo's but they didn't say anything about an amplifier
(i may have missed that due to skimming and saving
i have seen a few (some talk of some board - i forget the name and where at
the moment, i think one person said it wasn't available any more, but that
could have been an older piece of equipment first used for this) and still
need to read them more in depth (when time becomes available), but
i was thinking, if it needs some sort of mechanical device, what about
something like a linier (i know stat isn't the right word, a pot maybe?) that
one could be set up to both sides of center on the of the worm gear that
when the gear turns and moves the tab (or what ever you want to call th
The subject of using stepper motors for wheeled vehicle steering has been
brought up. I'm not going to assume that everyone on this list knows what
a stepper is so I'm going to tell you. A stepper motor is a type of
electric motor that increments in one direction or another in very precise
in
You fell right into Mr. Tyng's trap ;-)
By definition, as soon as you add feedback of any kind to an "open loop"
controller (aka. non-feedback controller), it becomes a "closed loop"
controller.
Practically speaking, a true open loop stepper controller would be a
very poor steering controlle
A servo would probably be simpler but more expensive
On 2014-03-26 2:14 PM, "Derek Engelhaupt" wrote:
> Sounds complicated...lol
>
> Derek
>
>
> On Wed, Mar 26, 2014 at 12:43 PM, isaac goldman
> wrote:
>
>> 1) because in the specific case of a stepper motor you can operate open
>> loop. So long
Sounds complicated...lol
Derek
On Wed, Mar 26, 2014 at 12:43 PM, isaac goldman wrote:
> 1) because in the specific case of a stepper motor you can operate open
> loop. So long as you know where you started and how many intervals youve
> gone you know where you are...
>
> 2) any microcontroller
1) because in the specific case of a stepper motor you can operate open
loop. So long as you know where you started and how many intervals youve
gone you know where you are...
2) any microcontroller these days can drive a stepper motor. Appropriate
control would ideally constitute a way to "zero"
"And as an aside you dont need a closed loop system; a stepper motor with
appropriate controls will work fine"
Since Chris is looking for self-centering, care to elaborate on why closed
loop would not be needed? Also, for those that may not be as well versed
in stepper drivers, care to list th
You can for ~ 30$ on hobbyking.com buy servos with 30 to 40 kgcm of torque;
the one i got for my turret zenith has 40 kgcm or almost 3 ft-lbs. You no
longer need to custom make a solution.
And as an aside you dont need a closed loop system; a stepper motor with
appropriate controls will work fine.
Chris,
For wheeled steering, no matter the mechanics (linear or rotary actuation),
you will want to implement a closed loop control system. In other words,
an R/C servo setup. If you take a servo apart, you will have a control
board, a motor, and a feedback potentiometer (or pot). It's this
There is a website that describes using a servos electronics to make a wiper
motor act like a giant servo. Can't find it at the moment though.
Sent from my iPhone
> On Mar 26, 2014, at 6:54 AM, isaac goldman wrote:
>
> It wont, or at least not open loop. Youll need some sensor to tell it when
It wont, or at least not open loop. Youll need some sensor to tell it when
it centers...
On 2014-03-25 10:38 PM, wrote:
> so anyone have any idea on how to make it self center?
>
> In a message dated 3/24/2014 7:13:17 P.M. Eastern Daylight Time,
> odysseyslipw...@aol.com writes:
>
> recently du
so anyone have any idea on how to make it self center?
In a message dated 3/24/2014 7:13:17 P.M. Eastern Daylight Time,
odysseyslipw...@aol.com writes:
recently during one of my boring moments sitting here on line, i saw a
some of sketches for a wheeled vehicle i work on from time to time
Im not saying it is a bad thing per say; the bad thing is you lose the
additional safety margin of having the motor spin and the steering slop
rather than having all the energy go into bending the tie rods and king
pins. Whether you need or value that safety margin is entirely a design
decision.
not sure i quite understand why you would think that the wheels not being
able to back-drive (as you call it, do you might mean back-feed?) the
linier drive would be a bad thing?
for taking a hit that hard to the wheels/steering i don't think there's
anything you can do, (beefed-up or not)
They offer the two edged sword that the wheels cant backdrive the steering
motor. On the upside that means your wheels point where you tell them. On
the downside if you hit a bump or the like that forces the steering to the
side something else has to give or everything has to be stronger because
yo
recently during one of my boring moments sitting here on line, i saw a
some of sketches for a wheeled vehicle i work on from time to time and
continued the thought.
i all ready worked out the basics for the upper and lower control arms, how
to make them pivot, i worked out how i would m
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