mini dozer!?!?!?

[r97]

wasn't sure to put this in the general discussion area or off-topic section, but what ever. also, i regret to warn you that i will most likely not be able to build this soon, maybe the summer if at all.....

that aside, i was surfing the web and saw this thing,

http://www.youtube.com/watch?v=Kei_ByF9DDE

looks sweet!

any way i found some more info on it, i think its powered by a gx270, geared for about 3 mph, and over 1000lbs pushing the thing along!

i was thinking if i could make the tracks using some conveyor chain, and some flat bar or even some channel.

then i could use the 2/5 scale sherman tank drive system.

http://www.youtube.com/watch?v=BWHAfaC-pPg

more info:
http://www.magnatrac.com/download/RS...ctSheet_NP.pdf

[fowler]

it actually says it is tensoiner clutch style so the serman tank drive would work

i have wanted to make sothing similar but havnt found the time

we have so many spare hydro motors and hydrolic gear that id power it with a 20hp honda pump that is superseded and make it hydrolic drive and operation

but when can we see one from u

[r97]

either around this summer, or after i get a job, and then retire, LOL. 20 hp in this thing would be crazy! i was thinking i would use a 13hp clone, i ran some numbers, boosted the power from 1000lbs, to almost 1500lbs. i'll go run the numbers for 20 hp !

EDIT: 2300 pounds!

[redsox985]

3 MPH!? Talk about serious reduction. Just by playing with our speed calc, 15" tread drivers (if I'm thinking clearly it would be like 15" tires), with a governed clone and a 50:1 reduction would achieve 3 MPH. I would use 2 jackshafts to get that ratio. Say motor to JS1 5:1, JS1 to JS2 also 5:1, then JS2 to axle 2:1.

[fowler]

it isnt 20hp direct it is 20hp though getto hydrostatic

how would u do hydrostatic with no electronics
u really need a pump connected though a touque converter

[r97]

heres what i got:

Engine HP 13 hp

Engine Rated at RPM 3600 rpm

Engine RPM Max 3600 rpm max

Chain Pitch .5 inches

Engine Clutch Sprocket # Teeth 10 teeth

Clutch Pitch Diameter 1.618

Drive Axel # Teeth 400 teeth

Drive Gear Pitch Diameter 63.662 inches

Tire Diameter 12 inches

Max Speed @ 3600 rpm 3.27 MPH

Force from engine pushing cart 1492.46 pounds

Chain Tension 281.3 pounds



what you saw in that video was with 1000lbs of force, think what 1500 could do, if i find an old riding mower with a 16hp or larger engine, and i build this thing, i could probably tow my house around! lol

[r97]

hmmmm.....
http://boston.craigslist.org/sob/grd/2229638211.html

i was just thinking how awesome it would be to put a diesel in this thing! muahahahaha!

[r97]

anyone remember that 4 cylinder i think 23hp military engine i found a while back? if only i could still buy it!

also check this stuff out, i like both of the roller chain options. the second option would be great, but i would need to figure out where to buy the chain..... probably not cheep . the first roller chain option would be cool if i could get it too work, probably cheep too! thoughts on welding roller chain? maybe i should see how the guys on "howe and howe tech" make tracks.

heres some links
http://www.rctankcombat.com/articles/track-systems/

[redsox985]

I like the studded conveyor belt. If you got a skip tooth sprocket, or just ground off every other tooth (so the bolts and teeth don't hit), you could bolt the belt to a chain and drive it off sprockets.

[r97]

kinda like a blend of the 2/5 scale tank, and the "bicycle chain tracks" (in the link i posted above). that could work well, i could probably make the track pads by having a piece of rubber on top of some flat bar, bolted through both, then through the belt and the chain.
would have to find some conveyor belt stuff.

[redsox985]

Bolt pieces of flat bar to the chain then just pull the bolts and install a few pieces of conveyor belt over that flat steel and tighten it down. So it's stacked bolt head, rubber, rubber, rubber, flat steel, chain, nut.

[r97]

don't you think it would be good to have little track pads to get extra traction on snow, gravel, etc

[Doc Sprocket]

Originally Posted by fowler

how would u do hydrostatic with no electronics
u really need a pump connected though a touque converter

Engine, pump, reservoir, 2 directional valves, 2 motors, hose. Basic.
What's the TC needed for?

[fowler]

i have the perfect cheap track

in a harvester there is the broard elivator which is basically 4 chains with a pad welded across the top and bars bolted to it so it can pull the crop though

we have to replace ours every second year and because every harvester regardless of brand uses it, it will be at any machinery sevice place and they will either sell it to u for dirt cheap or theyll pay u to take it away

we have hundreds of metres or this stuff at or dump so ill snap a shot

EDIT
u posted seconds before me toystory

if u just have 2 2 directioal valves then u have flat out or stop

realy u dont need the tc but what it will do is start pumping faster and faster as u throttle up

[fowler]

cheap tracks

u could cut the sid walls outta a small tractor tyre or do the same with a truck tyre ( i think u call them 18 wheelers)

or use 2 strips of the broad elivator and bolt them to a peice of conveyer and bolt blocks of hard plastic to the out side

only problem with conveyer is it is very dificult to cut and drill though