my push robot

Seen as I couldnt decide on a weapon I have decided to have a 4wd push robot that can drive either way up.

Heres the pic I drew up, I decided 4 12v motors, 100mm wheels, wedge shaped each end, the frame will be made of 20mmx20mm steel box section welded together, stainless steel shell, I have also added the notch between the wheels to keep the frame strong and stop it from looking to boring haha

http://i4.photobucket.com/albums/y11.../robotbone.jpg
http://i4.photobucket.com/albums/y11...robotbone2.jpg
http://i4.photobucket.com/albums/y11...robotbone3.jpg

Im thinking 500mm by 400mm? maybe to big/small?

I have 6000mm of 20x20 box section that weighs 13.5 pounds, I wont use it all tho

thanks for looking

That seems too big really. Remember that in most cases you want to make your robot as small as possible - there's no point putting armour around empty air and it just means that you waste weight you could use for more effective purposes.

The smaller the robot (while still fitting in all the internal parts) the more armour you can have, basically.

What kind of size area am I looking at for 4 motors, 2 batterys, and all the electrical bits and bobs? (not inc wheels) as I dont have any bits yet to measure :cry:

20-20mm box is way to over the top for a feather, you'd be better using 15-15 or mabye even 10-10, not only that but box section is heavy and you'll struggle to get it in weight - i shud no because its all i ever used to use.

i've got a 2 wheel drive box on wheels with a welded box chassis 1 x 12v sla battery and tbh its not go alot of box section in it and thats 8kg with only hdpe armour- you might get it in weight- you'd have to make it as compact as possible and go for hdpe armour as it'll be lighter

ok, what is the weight limit for featherweights in pounds?

Iv already bought the steel box so Im going to have to use it now :lol:

thank you

30lb - 13.6kg.

Thanks you, also what thickness HDPE is best? sorry for all the questions

Thick as you can make it and still make weight!

Your front and back wedges should certainly be metal - toughened steel is your best bet, such as hardox which is pretty popular with robot builders. If you're going to enter events with spinners (the uk championships and uk tag team championships) then you will want something a fair bit beefier than HDPE - hardox, grade 5 titanium or thick 6061/7075 aluminium (and by thick we're talking 20+mm) to hold up to some of the spinning weapons going at the moment.

If you aren't worried about spinners you should be able to get away with 10mm of UHMWPE (tougher than HDPE, bit more expensive though).

ok thank you, are most robots upto the 30pound limit?

I think plastic armor to save weight and only use hardened metal on selected areas for strength

The blue is plastic, Iv also narrowed the robot alittle

http://i4.photobucket.com/albums/y11...vans/jhjlk.jpg