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Originally Posted by sanddrag
If you are going to take jumps, you should make the car as light as possible, but don't sacrifice durability. For the role cage, do you have access to a welder? Even just a small arc/stick welder should work. If not, maybe an oxy-acetylene torch for brazing? If not, then perhaps a simple roll bar (as opposed to a full cage) would suffice. Find some tubing that has a hole the right size to tap for a machine screw/bolt. Then bend a hoop (leave the ends straight) and tap both ends. If it is aluminum, it is possible that you could just cold forge the threads using a Grade 8 socket head cap screw.
What is the car going to be based on other than the pocketbike engine?
Basically, what off the shelf parts are you using and what are you making yourself? I'm insterested in exactly what the frame, suspension, driveline, and steering are going to be and roughly what the overall dimensions are going to be.
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pretty much everything will be made by be or i will be peying someone to machine, we have a cnc mill at skool that i can use that i will most likely make parts on.
suspension-
i am not sure on yet, i may wait til after the wholething is made to have suspension so Iknow what to buy, in terms of strength because i dont want suspension on it fomr a mountian bike if it is like 100 poyunds, buit i also dont know what the force for max compression is on the T-MAXX suspension is.
Drive Train-
-either a weed wacker, chainsaw or pocket bike motor
-when i make suspension i will have to make drive shafts with U-joints in them, or buy alot from socket sets
-the main drive shaft i don't know yet because i dont have a engine, when i buy one i will update
-the differential, i may not start out with one because of the intial cost
-to control the throttle i will use a servo
for a clutch i will use a centrifugal clutch made for the motor i will buy(mostlikely the pocket bike motor), the only problem is i think they only come with a sprocket on the output, which wouldn't be a problem but those sprockets are weird because i bought one once and it didnt fit #35 chain, so i will have to machine that down to a cylinder and weld somthing on or just weld it to the sprocket so that it is a longer perimeter which will make the stress on it less and which will reduce the over all stress because of the larger diamter
Brakes-
i doubt i will have them on when i first finish it but WILL eventually add for saftey
Control-
i will use a T-maxx/E-maxx/Traxxas model TQ3 am wire controller, the only problem is that i dont know the maximum range of it, this will be the first item i buy because if i have no way on controlling it there is no use in making it
Steering- the steering will be based on the T-maxx/E-maxx/Traxxas steering system, i may start out with off the shelf parts but will eventually upgrade to machined aluminum part because of the forces on turning at high speeds, especially on uneven ground and in the dirt/sand
Frame-i will most likely use 1/16" walled 1/2" square steel tubingfor the first frame then upgrade once everything is in working order and i have added what i wanted( i have like 30 feet of it in my basement and i made my robot frame out of it which remind you i must is very very strong)
then i will probally use 1/8" walled 3/4" walled square aluminum tubing or use one 1/4" plate to mounted everything too kinda like the T-maxx frame but thicker
i have access to a welder on at home, which is a 90 amp chicago electric gasless flux cored mig welder(i know it doesnt sound like much but I welder the frame for my robot with it and it works wonderfully not to mention the frame hasn't broke yet after me jumping on it and throwing it around
also at school I can use our dynasty 200 tig welder
also one last thing I wanna add, is that once skool start i will most likely have an internship at a machine shop where i know the owner, i would have had it last year but our conselor is a different story
anything else you would like to know?