"scratching the surface"

[Jon Smith]

Spinner x motors.jpgSpinner x motors top.jpg

[Jon Smith]

my only concern with prop drives is that they are not robust enough for the stresses of being a spinner, What's your opinion?

[Jon Smith]

what 100mm wheels are suggested to give the best speeds. Metal construction with rubber is my preferred option.

[maddox10]

my only concern with prop drives is that they are not robust enough for the stresses of being a spinner, What's your opinion?

That I rebuild them with ease, simpler than brushed motors with a pressed metal can.

[Ellis]

I can't see any benefits over electric power. The torque an electric motor provides is essential in all things robots, pretty much. Plus, unless I'm missing something, I see no way of getting a proper melty brain drive out of an engine. Also, clutches? Fuels? Exhausts? I'd stick to the proven!

edit: see you edited that post :P

You'll generally find ESCs cost more than motors, unless you're including gear reduction into those price figures.

There are hundreds of options to look into, brushless-wise. I have no idea about ESCs, though. In conventional tank-steering robots, whilst as Mario said, brushless motors are ready, speed controllers that are suitable are hard to find.

There are one or two brushed motor options. The larger Dewalt motors, such as these, for example, have been the drive behind powerful featherweights (even lightweights) for years.

edit: as for wheels, "Banebots" 98mm wheels are popular. They can be found on www.technobots.co.uk, though Banebots are actually an American company.

oh and yes, custom wheels are very possible. Again, videos on how we made ours are on the channel linked in my sig.

[maddox10]

what 100mm wheels are suggested to give the best speeds. Metal construction with rubber is my preferred option.

I like HDPE with screwed on bike tyre. But other people did experiement with cast polyurethane foam, and that seems to work as well. Just a lot more expensive.

[Jon Smith]

So Maddox do you have some specs for the MSR 16-50 motors and gears including dimensions and weight and are they available for sale?

[Jon Smith]

Right now im thinking MSR 16-50 motors if I can get them and some BotBitz 85AMP ESC's. For power I would be looking at a 6s lipo to juice things up.

[maddox10]

Jon, You have a PM

[plargen]

i do like the design but i can see 1 problem how are you going to keep the sloped edge against the floor on both sides without it effecting ground clearance and traction, the easiest way i can think of is to have a hinged blade with a spring/elastic holding it down

also you could try using a couple of 2 speed drills for the drive as long as they put out 2000rpm it should do 23mph ish

[Jon Smith]

Yep I would most definitely get some form of helicopter effect giving a large ground clearance. as you can see from my early HW designs im using bracketed plates to cover the ground clearance. I will include these details in more advanced CAD drawings later. I would need to get all the internal components before I can settle on final design because of clearance issues and component placement.

[plargen]

oh yes i forgot about that ...... i also was thinking whether a 2 stage wedge would flip other robots better eg a shallow to steep angle, as ive seen most robots just glide over the top of most wedge designs or get end up on top

i did a 2 stage scoop/wedge on my 4wd and when i drove it at full speed into scruffy in testing it rolled it over

[Jon Smith]

That's a good idea, Loading up CAD as I type this. Thanks!

[Jon Smith]

Spinner x motors wedge ajust.jpg

[Jon Smith]

Like that?