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wiper servo

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Old 01-19-2010, 09:46 PM
  #1
ttr125fan09
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Default wiper servo

ok, i really need the power of a wiper motor for my servo in my build [link=http://www.rcuniverse.com/forum/m_9320096/tm.htm]HERE[/link]
what my question was, is a esc suitable enough to control a wiper motor,
would something like a Evx2 work or something smaller, bigger????
i have a wiper motor coming to me, i just was wondering if a esc could control it properly, i think it should work quite well, i just want some outside input.

EDIT

What amperage esc would work, 25, 30, 40, what?
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Old 01-19-2010, 09:52 PM
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Default RE: wiper servo

You're not gonna be able to run a wiper motor on 6V though....[]
And how are you gonna steer left and right with an ESC????
[&:]



There's a bit more to it when it comes to making a servo from a wiper motor, as covered in [link=http://www.rcuniverse.com/forum/m_9236698/tm.htm]THIS[/link] thread.








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Old 01-19-2010, 09:57 PM
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Default RE: wiper servo

the way i see steer left and right is forwards and back on the esc, but its controlling the steering. and most esc's arent 6v the one i have on my electric 1/8th is 16.8v

EDIT

the reason im not following that thread is because im horribly with circuitry[]
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Old 01-19-2010, 11:01 PM
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Default RE: wiper servo

Quote:
ORIGINAL: ttr125fan09

the way i see steer left and right is forwards and back on the esc, but its controlling the steering.

Yeah that could work I guess.
Dunno how responsive it would be though.

Still....
You might be on to something here.






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Old 01-19-2010, 11:13 PM
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Default RE: wiper servo

i just think it would be worth trying, the only problem i can think of so far is that i don't know if the motor will come back to the neutral position when you let off, you know?

on ebay, you can get 50 amp esc's with reverse for 30usd, so im gunna try one out, and i'll post the pro's and con's (hopefully more pro's)
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Old 01-19-2010, 11:17 PM
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Default RE: wiper servo


Quote:
ORIGINAL: ttr125fan09

the only problem i can think of so far is that i don't know if the motor will come back to the neutral position when you let off
Probably won't, no.....
There is someting you can buy though that will center the steering automatically once you let go.
Saw it done on Scrapheap challenge (UK version of Junkyard Wars) when they RC'd a normal car using a motor form an electric wheelchair for steering servo.

Wouldn't have a clue what it's called though and I think it was pretty expensive too.




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Old 01-19-2010, 11:34 PM
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Default RE: wiper servo

Quote:
ORIGINAL: Dirty_Vinylpusher

There is someting you can buy though that will center the steering automatically once you let go.
i think what you are talking about is a pot, or potentiometer. i think thats it, not quite sure
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Old 01-20-2010, 12:21 AM
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Default RE: wiper servo

The pot you are talking about is there to tell the circuit board where the servo is positioned. Based on the current position, the circuit board tells the motor to spin one way or the other when you steer left or right to go there. Now, if you want to build one yourself using an ESC, you would still need to implement a direction sensor, or else the motor would spin continuously in one direction when you turned the steering wheel. The motor would spin with a speed, and not position, proportional to how far you turned the dial. As a result, this would make driving a bit difficult since you'd have to be the pot and turn left, then right, then left a bit...just to go to one specific location.

Is one of the larger servos, like Tonegawa, or a dedicated board to control the wiper out of your plans?
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Old 01-20-2010, 01:07 AM
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Default RE: wiper servo

Quote:
ORIGINAL: Fabe

if you want to build one yourself using an ESC, you would still need to implement a direction sensor, or else the motor would spin continuously in one direction when you turned the steering wheel. The motor would spin with a speed, and not position, proportional to how far you turned the dial.

True.
There needs to be something "telling" the motor when and where to stop.
Also, there wouldn't be much, if any, holding power unless a pot was involved, correct?


Either way I think you'll get away with using two Quarterscale servos to steer this thing....











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Old 01-20-2010, 10:31 AM
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Default RE: wiper servo


Quote:
ORIGINAL: Dirty_Vinylpusher

True.
There needs to be something ''telling'' the motor when and where to stop.
Also, there wouldn't be much, if any, holding power unless a pot was involved, correct?


Either way I think you'll get away with using two Quarterscale servos to steer this thing....
Since the wiper motor is probably much more capable than a small servo motor, I'd say the limiting factor for holding power is the ESC. Until it burns out, you'd get as much current as it can supply. However, it would be quite awkward to steer since the ESC is designed to control speed and not position of a motor...so dual large scale servos = great idea
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Old 01-20-2010, 02:40 PM
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Default RE: wiper servo

I foregot I had this lying around. Its from an old toy [sm=regular_smile.gif]


The Idea is that the torsion spring (like a servo saver) takes the force but this one also centres it.

Video:

[youtube]http://www.youtube.com/watch?v=wu0tLuOUOxw[/youtube]
(Sorry for the blurry pics and video)

This used to be wired into a spaghetti junctions of wires ect.
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Old 01-20-2010, 06:23 PM
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Default RE: wiper servo

Quote:
ORIGINAL: Dirty Vinylpusher
Either way I think you'll get away with using two Quarterscale servos to steer this thing....
The only problem i have with this is i dont have to money to buy 2 quaterscale servos, i already have a wiper motor, and im just looking for a cheap way to control it

Quote:
ORIGINAL: Fabe
Is one of the larger servos, like Tonegawa, or a dedicated board to control the wiper out of your plans?
i really cant afford to put out enough money to buy a Tonegawa, but if i could buy or try to make a board to control the wiper for 30-40usd then i could do that, but other wise no it wouldn't be in my plans


mrmikey, that may work for a cheap solution, do you know where i could get a spring like that
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Old 01-20-2010, 08:25 PM
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Default RE: wiper servo

1/4 scale servo's aren't that expensive though....
If you're prepared to spend 30-40 bucks on something that may or may not work, maybe it would be worth saving up another $40 and get something like this?
[link=http://www3.towerhobbies.com/cgi-bin/wti0093p?&C=MAG]CLICK[/link]


At least then you know it'll work straight away.


Not trying to downplay your ideas, as you know I'm all for home made stuff, but sometimes one has to bite the bullet and fork out a couple of extra bucks.









That was my $0.02


Free of charge.














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Old 01-20-2010, 09:50 PM
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Default RE: wiper servo

i understand you completely dvp,
and i may just save up and order one just in case the idea doesnt work,
you have an extremely good point
Quote:
If you're prepared to spend 30-40 bucks on something that may or may not work, maybe it would be worth saving up another $40 and get something like this?
CLICK
At least then you know it'll work straight away.
for right now im trying to keep it as non-production as possible, but if all else fails then i will defiantly get a servo capable of what i'll need
but thanks so much for having interest in what im trying to do
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Old 01-22-2010, 10:40 AM
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Default RE: wiper servo

On one tread with a servo saver like this (with two shock aborbers) :


Tho this wouldn't actully center it after so it would need to be apdapted.

I have an Idea but I find diagrams are better than words... I'll be back later.
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Old 01-22-2010, 11:24 AM
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Default RE: wiper servo

Something tells me that most wipermotors have a worm gear like this:


So it wont help if you make a self centering system because it wont be able to move the output shaft from the motor.
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Old 01-23-2010, 10:52 PM
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Default RE: wiper servo

thats a cool servo saver setup there,

and im not quite sure if wiper motors have those gears, if they do, then i'll have to do something electronically
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Old 01-24-2010, 11:12 AM
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Default RE: wiper servo

Sorry to say,but here is a typical housing/motor for wipers:
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Old 01-24-2010, 08:36 PM
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Default RE: wiper servo

well then i guess electronically it the way to go, unless i got rid of those gears, hmmm........., i wonder if it would still have enough torque
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Old 01-25-2010, 12:32 PM
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Default RE: wiper servo

Maybe hard to imagine,but the motor inside this housing have a high range of rpm,but how many rpm's there is i dont know.So without using the worm gear setup this motor is useless.The torque lays in the gearing if you see what i mean
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Old 01-25-2010, 06:00 PM
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Default RE: wiper servo

i was even thinking, change the type of gears, so that a return spring could work, also so you could maintain the gear ratio
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Old 01-25-2010, 06:34 PM
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Default RE: wiper servo

im thinking electronic is the way to go...

if you can find a 6volt gearhead motor thats strong enough to turn your wheels then this circuit is the simpliest

http://130.94.182.150/servo.jpg

a 6volt system is easier than a 12 volt system....
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Old 01-25-2010, 07:21 PM
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Default RE: wiper servo

da mad maori
what exactly does this do?
does it return the motor to center, with a pot?
or does this control the motor and return it?
can you explain this to me, and also what would i need to make this?
could you also explain some of the symbols

are these what the the circles with letters in them are
[link=http://www.alliedelec.com/search/productdetail.aspx?SKU=9357044]HERE[/link] and [link=http://www.newark.com/jsp/search/productdetail.jsp?SKU=31C3584&CMP=AFC-GB100000001]HERE[/link]
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