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? |
RE: wiper servo
You're not gonna be able to run a wiper motor on 6V though....[:o]
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. |
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[:o] |
RE: wiper servo
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. |
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) |
RE: wiper servo
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 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. |
RE: wiper servo
ORIGINAL: Dirty_Vinylpusher There is someting you can buy though that will center the steering automatically once you let go. |
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? |
RE: wiper servo
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.... |
RE: wiper servo
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.... |
RE: wiper servo
I foregot I had this lying around. Its from an old toy [sm=regular_smile.gif]
http://i842.photobucket.com/albums/z.../DIYServo1.jpg 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. |
RE: wiper servo
ORIGINAL: Dirty Vinylpusher Either way I think you'll get away with using two Quarterscale servos to steer this thing.... ORIGINAL: Fabe Is one of the larger servos, like Tonegawa, or a dedicated board to control the wiper out of your plans? mrmikey, that may work for a cheap solution, do you know where i could get a spring like that |
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. ;) |
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 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. but thanks so much for having interest in what im trying to do |
RE: wiper servo
On one tread with a servo saver like this (with two shock aborbers) :
http://i842.photobucket.com/albums/z...ServoSaver.jpg 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. |
RE: wiper servo
Something tells me that most wipermotors have a worm gear like this:
http://www.gears-manufacturers.com/gifs/worm-gears.jpg So it wont help if you make a self centering system because it wont be able to move the output shaft from the motor. |
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 |
RE: wiper servo
Sorry to say,but here is a typical housing/motor for wipers:
http://www.thermostats-china.com/ima...iper-motor.jpg |
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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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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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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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.... |
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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