Go Back   RCCrawler Forums > RCCrawler General Tech > General Crawlers
Loading

Notices

Thread: building my own crawler

Reply
 
LinkBack Thread Tools Display Modes
Old 11-24-2008, 12:35 PM   #21
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default made a platform

made a platform and mounted the 2 motors tonight , the 2 aluminum straps will act as "heat syncs" as well.
buju is offline   Reply With Quote
Sponsored Links
Old 11-24-2008, 04:21 PM   #22
RCC Addict
 
Join Date: Mar 2007
Location: St. Louis (High Ridge)
Posts: 1,279
Default

as tight as your clapms may be I'd still recomend running a bolt with spacers thru the ears on the ends of the gear boxes to keep them from twisting.

wire the motors in series to get to 7.2v. it should help keep them from burning out.
hairba11 is offline   Reply With Quote
Old 11-24-2008, 08:18 PM   #23
Quarry Creeper
 
Join Date: Jan 2007
Location: Ontario, Canada
Posts: 341
Default

If you wire them in series itll be like driving with an open center diff.
HndsWthtShdws is offline   Reply With Quote
Old 11-25-2008, 07:26 PM   #24
RCC Addict
 
Join Date: Mar 2007
Location: St. Louis (High Ridge)
Posts: 1,279
Default

Quote:
Originally Posted by HndsWthtShdws View Post
If you wire them in series itll be like driving with an open center diff.
a.k.a. clodstall. doesn't matter if it is series or parallel wiring. at least not much.
hairba11 is offline   Reply With Quote
Old 11-25-2008, 07:37 PM   #25
RCC Addict
 
Join Date: Sep 2007
Location: Westland, MI
Posts: 1,508
Default

Go to it man. I see potential.
hitman46mod is offline   Reply With Quote
Old 11-25-2008, 11:26 PM   #26
I wanna be Dave
 
Join Date: Nov 2008
Location: Where freedom is earned.
Posts: 2,011
Default

Just a little advice,,,, Your lower links should be lower on the axle, and your top links have too much angle. lower the chassis end of the top links and you'll greatly improve your articulation, they are also too short. connect them closer to the "tub" of the chassis.
I've built many a full size crawler/buggy, and it's all in the geometry.
Google, 4-link calculator, and you'll get the picture.
Nice to see you sticking with the effort, definantly out of the box. I'm looking forward to see how it progresses, should be a good learning experience.
Krakker is offline   Reply With Quote
Old 11-26-2008, 03:59 AM   #27
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default yes it does matter , very much in fact

Quote:
Originally Posted by hairba11 View Post
a.k.a. clodstall. doesn't matter if it is series or parallel wiring. at least not much.
ahh , yes it does matter , very much in fact , because if the motors are wired in series then what will happen is when one motor has load applied to it and slows down amperage will be transfered to the other motor with less load , now if each motor is connect to a axle the following will happen: example:
you are climing a obstical , the front diff gets airborne or gets to slipperly surface as compared to the back , the front wheels start slipping and the rears start loading up in relation to the front , now we have the rears with load and the front with less load , amperage is transfered to the front and they keep on slipping and the rears get less or even nothing , now to get over this obsticle you need the rears to push the fronts forward.

what you actually need is a "reverse" circuit whereby the motor with the most load gets the most amperage . A work around for this is to run the motors in parallel so each motor get the same amperage.

I can setup a test bench , vid it and post if you guys want ...

Last edited by buju; 11-26-2008 at 06:30 AM.
buju is offline   Reply With Quote
Old 11-26-2008, 08:08 AM   #28
I wanna be Dave
 
Big Mike's Avatar
 
Join Date: Oct 2006
Location: Martinsburg WV
Posts: 2,781
Default

I have to applaud this effort. It makes me feel good to see someone take the initiative, use whatever they happen to have at hand and make a serious attempt at a build. This project was obviously driven by a lot of desire and determination. Bravo!!

Even if the end result is not what some of us here would consider "acceptable", the experience gained through a project like this is invaluable.

You're already into the crawling cycle - concieve it, build it, drive it, break it, fix it, improve it, repeat as needed. You're off to a great start IMO. The more time you spend here the more you'll learn...
Big Mike is offline   Reply With Quote
Old 11-28-2008, 03:32 PM   #29
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default ver 2






here is a video

http://s267.photobucket.com/albums/ii319/buju357/?action=view&
current=28112008.flv
buju is offline   Reply With Quote
Old 11-28-2008, 03:34 PM   #30
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default

Quote:
Originally Posted by Krakker View Post
Just a little advice,,,, Your lower links should be lower on the axle, and your top links have too much angle. lower the chassis end of the top links and you'll greatly improve your articulation, they are also too short. connect them closer to the "tub" of the chassis.
I've built many a full size crawler/buggy, and it's all in the geometry.
Google, 4-link calculator, and you'll get the picture.
Nice to see you sticking with the effort, definantly out of the box. I'm looking forward to see how it progresses, should be a good learning experience.
thanx , will check it out , although it does articulate right up to the end of the shocks.
buju is offline   Reply With Quote
Old 12-02-2008, 12:30 AM   #31
I wanna be Dave
 
Join Date: Nov 2008
Location: Where freedom is earned.
Posts: 2,011
Default

Your main articulation is due to the springs/shocks being mounted closer to the center of the chassis. If you move them further out, you will gain more stability. You don't need that link in the middle either, yank it out and you'll be fine. Leveling your link angles will help it to move up and down as well as "flex"/articulate. With out the shocks it should sag to the ground wit no binding.
Keep refinning it, you're learning things fast that take most people YEARS to figure out. And your staying busy instead of playing XBOX and turning into a 30 something loser living in your parents' basement.
Krakker is offline   Reply With Quote
Old 12-02-2008, 03:09 AM   #32
Newbie
 
Join Date: Oct 2008
Location: Chicago
Posts: 7
Default

That's definitely crazy looking. Weird suspension geometry...But if it works, it works.
b00sted is offline   Reply With Quote
Old 12-02-2008, 09:09 AM   #33
Rock Stacker
 
Join Date: Nov 2008
Location: charlottesville
Posts: 66
Default

you never know what works and what doesnt until you try. i applaud the effort he has put forth. where would we be now if no one thought outside the box? ill be waiting on a vid after its completed.
trackman is offline   Reply With Quote
Old 12-02-2008, 10:46 AM   #34
No idea what I'm doing
 
Join Date: Oct 2008
Location: Underground, CO
Posts: 4,529
Default

I think you chose the wrong screen name......you should call yourself McGyver! I can't wait to see how this turns out for you. Good luck and keep the pictures coming! I'm subsrcibing to this one for sure.
C*H*U*D is offline   Reply With Quote
Old 12-03-2008, 12:50 PM   #35
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default

quick update , traxas diff installed in the front with drive shaft , still lots more to do...
buju is offline   Reply With Quote
Old 12-03-2008, 12:58 PM   #36
RCC Addict
 
Join Date: Feb 2008
Location: Hiatus..sutiaH
Posts: 1,620
Default

Ok, I have held back any negative comments as I don't feel they are needed. I am glad I did because I like what you have made. Good job man - the execution is too original to not like.

But what we all are needing is video of it in action. That will dispel all rumors either good or bad.
O.C.D. is offline   Reply With Quote
Old 12-03-2008, 01:02 PM   #37
RCC Addict
 
Join Date: Sep 2007
Location: Westland, MI
Posts: 1,508
Default

May I make one small recommendation, move the lower ends of the shocks out near the ends of the mounts. It will make for a more stable platform.
hitman46mod is offline   Reply With Quote
Old 12-04-2008, 08:28 PM   #38
Newbie
 
Join Date: Feb 2007
Location: Earth
Posts: 47
Default

Dude, I love your ingenuity! Post up a vid ASAP!
David is offline   Reply With Quote
Old 12-09-2008, 03:07 AM   #39
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default

http://www.youtube.com/watch?v=JCWMuLMoQPw

http://www.youtube.com/watch?v=UWbaCFP4rU8
buju is offline   Reply With Quote
Old 12-11-2008, 02:40 AM   #40
Rock Stacker
 
Join Date: Oct 2008
Location: South Africa
Posts: 58
Default

buju is offline   Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 05:53 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com