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building a mini rock crawler from scratch- need help!

Old 04-11-2005, 04:46 PM
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jadster
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Default building a mini rock crawler from scratch- need help!

I am building a mess around mini rock crawler from scratch out of plastic sheet and t maxx springs! so far i have built the hole chassis and installed the turning servo but i have reached a problem, my speed control will not work so i need a way of connecting 4 motors to a reciever, since you connect servos straight to the reciever i thought it could be done, anyone got any ideas? thanks
Old 04-11-2005, 09:30 PM
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thumpin15s
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Default RE: building a mini rock crawler from scratch- need help!

not gonna happen man. I am kind of confused though, why do you have 4 motors??? ANd, how small do you mean by "mini", like 1/18 scale? or what?
Old 04-12-2005, 10:22 AM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

about 1/18 i supose i will try to post pics if i ever find out how to! its only a fun one so i have a motor for each wheel saves drivelines etc all I need to know is if you can link a motor straight to the reciever or do you need a esc?
Old 04-12-2005, 10:36 AM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

actualy its alot samller than a tlt rock buster thing its just bigger than my hand.
Old 04-12-2005, 01:16 PM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

i really need help you see i had the idiea of glueing a wheel straight onto the motor but the problem is the motors all go in the same direction so two wheels go 1 way and two go the other is there any way you can solve this? plz help asap
Old 04-12-2005, 01:54 PM
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UtahRacer13
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Default RE: building a mini rock crawler from scratch- need help!

Reverse wire 2 of the motors.
Old 04-12-2005, 02:57 PM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

ok i got that working, what about the speed control? can i connect the motors straight to the reciever?
Old 04-12-2005, 06:18 PM
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WillRRoberts
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Default RE: building a mini rock crawler from scratch- need help!

no you will have to run two evx's, then run a y-harness to connect them to the reciever
Old 04-13-2005, 04:57 PM
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Default RE: building a mini rock crawler from scratch- need help!

whats a evx? and whats a y-harness lol got any links? also is there a battery pack just a bit lighter than a full 7.2v stick because i was planning on using 2x four AA battery packs but for some reason if you connect 4 AAs to the reciever and a ESC to a recieaver the batterys start smoking??? o yeh i found a new speed control but would still rather connect straight to the reciever.
Old 04-14-2005, 10:24 PM
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WillRRoberts
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Default RE: building a mini rock crawler from scratch- need help!

2x Traxxas EVX - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXAJD6&P=ML]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXAJD6&P=ML[/link]
1x Hitec Y-Harness - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXWB69&P=7]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXWB69&P=7[/link]

- thats all you need to run 4 engines(minus batteries,etc...)
Old 04-15-2005, 10:04 AM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

the motors are really small not 540s not sure quite what tho maby a 280?? i got them out of an old tyco rc toy car do i realy need 2 EVXs?
Old 04-15-2005, 09:24 PM
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freddyg
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Default RE: building a mini rock crawler from scratch- need help!

jadster, you cant connect the motors directly to the reciever, but you can run the motors off of a servo controller board. however, with what i'm assuming you experience level is, i wouldn't suggest that, its pretty involved. if you're really careful about how you wire the motors, i would reccomend a spy esc from novak http://www.teamnovak.com/products/ES...erse_index.htm. to wire this controller to your motors, and not smoke it, you would have to wire the motors in series, that is : from speed control pos to motor1 pos, motor1 neg to motor2 pos, motor2 neg to motor3 pos, motor3 neg to motor4 pos, and motor4 neg to speed control neg, although you'll have to swap neg and pos in there somewhere. basically its a huge pain.
btw, you do have a gearbox on each motor right? if you dont have some sort of gear reduction i highly doubt that you'll have much luck with the truck.
Old 04-16-2005, 04:40 PM
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Default RE: building a mini rock crawler from scratch- need help!

ok... my idea was... just to link all the motors together and solder 8 wires into 2 and then solder some connecters on the end then connect that to a no limit speed controller then just connect a 7.2v stick to that and then connect that to the receiver oh yeh and a servo to the receiver too, and no the wheels are glued straight onto the motor pinions, do u think it'll work?
Old 04-17-2005, 01:06 PM
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Default RE: building a mini rock crawler from scratch- need help!

Youre saying the wheels are glued directly to the motor? No gear reduction? If so, your going to have a pretty hard tire crawling without any gear reduction.
Old 04-19-2005, 02:15 PM
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Default RE: building a mini rock crawler from scratch- need help!

About using both Reciever batteries and esc

Can you somehow use both - or by using 2 ESC do you Double the voltage goin to the Servo's as i am currently running thinkin about running 4 wheel steering which will require 2 serov's obviously not using the link provided just added itself
Old 04-20-2005, 12:06 AM
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Default RE: building a mini rock crawler from scratch- need help!

you can use both an esc and reciever batteries, but you have to disconnect the power wire coming from the esc to the reciever, (you can find instructions all over) also with dual esc's you need to disconnect the power wire from one of them. dont worry about the power supply for the servos on that small of a vehicle.
i think i would look into some gearing for those motors, otherwise it just wont work very well.
Old 04-22-2005, 05:03 PM
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Default RE: building a mini rock crawler from scratch- need help!

ya you will have no torque hardly at all with the wheels directly on the motor shaft
Old 05-04-2005, 11:51 AM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

but power is lost between motors and gearing...so i wud of thought this would be more effective?
Old 05-04-2005, 01:47 PM
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Default RE: building a mini rock crawler from scratch- need help!

if there is any power lost, its not noticable. Running through gears will give you more torque. (well, depending on the gearing) But...no offense, from what your talking about, you'd be better off just starting with something like a TLT and learning a little more before trying to do something like this. I mean...it just seems like its going no where fast, and that its not really gonna happen.
Old 05-04-2005, 03:10 PM
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Daveyboy2oo1
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Default RE: building a mini rock crawler from scratch- need help!

chk this out they use servos for motors http://www.fastboy.pwp.blueyonder.co.uk/truckpics.htm
Old 05-04-2005, 03:46 PM
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SuperCrawler
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Default RE: building a mini rock crawler from scratch- need help!

Is this guy even serious?
This is the worst thing i have ever heard.

I even saw a thread about this thread, laughing about the idea on
rccrawler.com
Old 05-08-2005, 04:44 AM
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jadster
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Default RE: building a mini rock crawler from scratch- need help!

as i said before this i not a serious crawler just a bit of fun and the main part is making it my self for basicly nothing....so why would a buy a TLT?
well when i get my camera developed I will show you a pic of it!
Old 11-05-2007, 02:46 PM
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Default RE: building a mini rock crawler from scratch- need help!

try hooking them up in seies(daisy chain the motors) and hook em up to a cheap mechanical speedo,,DONE!
Old 11-05-2007, 02:49 PM
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Default RE: building a mini rock crawler from scratch- need help!

Its a bit late for that now, and parallel would be more effective.
Old 11-10-2007, 04:04 PM
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Default RE: building a mini rock crawler from scratch- need help!

pics?

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