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Hi guys!
I am looking into building a chassis with HDPE or a similar plastic (what do you guys recommend? I know there are several plastics that are used). My question is, for a chassis, what kind of mm am I looking at? Would 12 be a little measly?
Thanks, I'll post any questions (sorry! :)) I have to do with robots in here.
Ellis
12mm would be good (if youve got the money go 20mm)
Hm. How about 15mm? Compromise! I plan to have the walls as low as possible, in the region of 5cm, so I'm not sure if 20 is really necessary, since the weight and strength baring sides are small and therefore will flex less, right?
I use 15mm at 60mm high and works fine
Well I've just downloaded Google Sketchup. I see everyone making really good CAD stuff and I have always thought it must be super difficult. For a first project I made a to-scale (within half or less of a mm) drill motor!
http://storage.darkdemon.org/16909/1303225355.png
http://storage.darkdemon.org/16909/1303225490.png
Quite proud for a first try! The program is so intuitive.
This means I'll hopefully be able to represent a basic idea for my robot. I think I'll go with 15mm, 20 mm seems like overkill imo.
More messing around with CAD, a few hours and I have this. It's all 100% to scale. Wheels are very small, about 5cm. This doesn't bother me, in fact it gives the bot a lot of push due to gearing. Plus, I'd most likely over volt somewhat, as at 550rpm or so this thing will only just pass 3mph. Volting to 24 I get around 7mph and more torque.
Right? :crazy:
http://storage.darkdemon.org/16909/1303245020.png
http://storage.darkdemon.org/16909/1303245258.png
Was extremely fun making these CAD things, one afternoon and I thought this thing took weeks to learn how to use.
Are you sure you'll have enough ground clearance with 50mm wheels? From memory, the outermost part of a drill motor gearbox is close to 50mm in diameter which, by the time you add on a few extra mm top and bottom for a baseplate/top armour, means you could suffer grounding issues on arena floors.
Why not go for some 75mm wheels with nut inserts from Robo Challenge? They're still relatively small which maintains some torque yet are less likely to cause grounding issues due to increased clearance, plus you'd get a little extra speed too. They also do 63mm wheels if I remember rightly (although not sure if they come with a nut insert - could probably be made up though) if 75mm is a bit too big for your liking.
Overvolting a 12v drill motor to 24v might cause it to burn out. I think people tend to recommend overvolting to 1.5x as a general rule. I'm on 19.2v on 12v drills, but at the uk champs I only moved for about 10seconds :roll:
I would advise against exposed wheels too.
Nice Sketch Up work, I've been playing around with it for a while now, but I really struggle to get any of my 3D models made up of components symmetrical.
i dont think i ever measured or planed anything :D