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

Your design reminds me very much of Team Shock's old FW Lightwave:

http://www.roamingrobots.co.uk/?pages=robot&id=1008

Nice design, hope to see it in action soon.

Word of advice, screwing into HDPE is generally not a good idea, you should have some manner of bracing between plates.

Cheers dave, hopefully I'll be getting 4x 12v motors, 4x 100mm wheels, 2x speed controllers, 2x 7.2v 4500 batteries, black and red silicone wire and a removable link this weekend so I can finally get started :lol:

I hope I'll be able to start making my frame in my mates bodyshop this weekend to as I need to use his welder. :P

fit a weapon

similiar to my first robot prodigy, i used cheap box section from b&q, i had 5mm mild steel scoop, 10mm hdpe bolted to the sides and back, 4mm hdpe lid, 2mm stainless base. Was a really simple design you can build one in a good afternoon lol, think i built about 4 versions including a clusterbot.

(going off memory here)

it ran on 4 drill motors, with a sabertooth, and 2 x 9.6v packs. was my most successful in competition, most reliable and easiest to fix.

I was never bothered about sticking it in with any spinner, had a few spinner fights and never lost one. all you needed was a file and hammer to fix the knocks, and u were ready to go again.
great first robot, but for me I soon got bored of not causing damage to others and just recieving it :lol:

my first ever fight with it, and it was against 2 spinners!

http://www.youtube.com/watch?v=Z-BLc9ZjOyE


testing my old spinner out on prodigy chassis

http://www.youtube.com/watch?v=TlFBuJjIh9A

http://www.youtube.com/watch?v=sAQ--9z2BQM

not sure where prodigy is now, did sell it to jack orr i think??, got a 6 wheel drive version here but i havent bothered to finish that one at the moment, its gathering dust on my shelf.

As mentioned above you are going to have weight issues without a doubt, you are gonna have to drill alot of holes to reduce the weight!!, you will be surprised when you put 4 drills,wheels, batteries and speedos on a set of scales how heavy it will be.

yes i have it, was in the middle of fitting some speed controllers before we came down to the island, now iv got the others out the way i can get it all sorted :)

also, that design looks good, liking the funky curves ^^ dont tap HDPE it will fail pretty soon, (check out the how to section on my site for more details) it should be a nice platform to start on! get it down to a few events and enjoy!

jack

Hello guys thanks for all your comments, I will post some pics soon :proud: