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Hydraulic Steering made simple.

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CCFBERG

Rock Crawler
Joined
Feb 22, 2007
Messages
567
Location
Ramstein Air Base Germany ...ya Ive been Ramshafte
Ok so for months Ive been working on a comp tuber and in the very begining I told a good buddy of mine "dude wouldnt it be cool to have hydro steer just like the real Crawlers". Well He said it would be cool but that It wouldnt work, and that you probably couldnt build it small enough to mount it on a R/C crawler and have it be reliable on the rocks. Little did he know all he did at that point was light a fire under me to make it happen but at the same time he was probably telling me this because he knows me and knows that I will spend months on something and it will be forever before we crawl together. He was right!! Its been 8 months since I got back from my deployment and Ive spent countless hours at work on my Custom TLT based Comp 2.2, to say the least my good friend isnt happy with me and I recieved a text msg from him the other day saying "HTFU" he he On a good note........I am almost done and will post pics of everything I have done once I figure out what I am going to copyright and what I am not. However because there are things in this world that are of no mystery to some and totaly forien to others I have decided that I am going to post something that I think could be the next best thing to the R/C crawling industry and encourage anyone to improve upon my design, have fun with it and lets see some of the awsome tallent out there!

Hydraulic Steering made simple!

Basicaly it started with "what the hell am I going to use?" Aluminum, Brass, steel,? How was I going to seal it all up, how will I bleed the system? How am I going to make it look scale and will it have enough force for crawling? It has to be rebuildable on the trail!

I am no stranger to hydraulics or mechanics so Ideas started to form very quickly, I took a look at the years of stuff I have acumulated in my shop and was still scratchin my head. But then I decided to start with the simple things.........seals! I took a look at the shocks that come with the tlt kit and decided to start cutting them down on my lathe and parted the sealed end from the rest of the shock thus making a (seal end pack). Once I figured that out it was a piece of cake! So because I am long winded and just realized that most of you probably dont want to read all this I will let the pics and video explain itself!

One more thing remember if your going to do this keep it simple!! Also all this is is a simple closed loop static system (Master and slave) setup just like the hydraulic clutch system on some cars/trucks/heavy equipment. No pumps, no valves just a servo to actuate it!

Enjoy!!! And remember to click on the link to the video and turn you speakers up!"thumbsup"




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for oil I use airtool oil sold at Lowes seems to work well!
 
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WOW:shock:

Simple, clean and effective. I love it!

So... is the amount of torque applied at the TLT knuckle relative to the servo torque specs?
Is there any gain in torque?
Has your setup been reliable?
What about the effects of temperature on the air tool oil? will it thicken up or thin out with the change of the temperature?

I like the idea of being able to mount the servo setup any where in the truck, it frees up more room for other things.:twisted:

Nice work!
 
Thanks man, actualy just finnished it last night! Havent figured out all the math yet but the servo Im using is 146 inoz, I need to find my book with the math equasion in it for this, but yes after testing it for the last week there is a conciderable amount of force aplied to the knuckles so the need for buying a $300 servo is not there. Also this is the product of many failed attempts and revisions so I have worked out all the kinks ( I hope!!!!):roll: and hopefully have covered all the areas of possible failure on the rocks and quick fix items! I would say that just like most oils there will be some thermal expansion and thinning but Im not going to worry about it because of the small scale and emount we are talking about, and as far as cold conditions and the oil thickining up.......... so I lose a little steering speed still cool though!! I did however think a little about using an acumulator setup to compensate for the things you asked but again decided its not needed on this small of scale as well as the need for a static supply tank. Also this oil is extreamly thin almost like water thin but very very slipery.

Thanks again for your comments!"thumbsup"
 
thats really cool, but i think your master cylinder pistons are too long...your going to have to have farly long servo horn to be able to throw those things dont you think..what if you made the cylinders fatter so you could use a shorter piston...just and idea and i may be completely wrong idk...but still very impresive
 
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