Are these the proper speed 900s? Or the replicas? Because they look real, but I thought the proper ones were £60 not £40. Thanks
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Are these the proper speed 900s? Or the replicas? Because they look real, but I thought the proper ones were £60 not £40. Thanks
I think you've missed the link out.
If its the ones on eBay, then I'm sure they are replicas of some sort. I'm thinking of running two of them on 30a electronizes but I'm not sure whether it's worth the investment seing as I'm running four 18v drill motors at 24v at the moment
i have considered these yet ive found running 12v drills on 18v gives me a bot that's plenty quick enough
I have that setup, and I agree, any faster and it would start getting really hard to control.Quote:
Originally Posted by mattsdragons
Proper ones are £40. Got mine a few weeks ago from Cornwall models
Woops!!!! Its: http://www.sussex-model-centre.co.uk/sh ... sp?id=5438 and i used drills before, but they don't have the strength/speed/ shape/reliability I require, bruiser used drill motors, and it was ok, but nothing better, I wont to build a faster more competitive robot, which can be fast, so it can easly get round the RL/RR arenas, with out boreing the audience...
On the real Speed 900 what is the schematic for the attachment hole positions? Also in the pictures it looks like thee is a small bit that sticks out the front of the the mouuting frame with the shaft. What is the diameter of that and how far does it stick out from the mounting frame?
Or does anyone have a good CAD model of it, preferably solidworks... (Yeah long shot I know)
A speed 900 has a nose of 22mm, 6 long.
Ok, and does anyone know it's touque? Just so I can see if the gear reduction I plan to do is ok
A real Speed 900 does 1.1 Nm@12V in stall
Ok, and how much force would it take to drive a robot? Would 2.5 kg of force per wheel be anough?
Depends on other factors too.
biggerwheels have less roll-resistance, to give one of the variables.
Roll resistance? What is that? And btw, it's 4 wheel drive
Roll Resistance. (Google it please)
The reason why cars are getting bigger wheels over time.
See the difference between an original mini cooper and the new one. And no, it's not a marketting ploy, but a way to get a little better fuel efficiency without investing big loads of money into more efficient engines.
Would it be overkill to use 2 of these motor to drive a disc, I have more than enough weight spare. And what ratio you typically use with these motors?
its not un heard of
not sure on ratio
Drumroll used 2 on its drum originally I think. Also, I think Inertia uses 2 of them to run its disc, so not a bad example to copy :)
2 it is then, with a combined torque of 2.2Nm it should easily spin a 2Kg disk up to some serious speeds!
Yep, I use 2 speed 900's on Inertia XL to power the disc which weighs 2kg. Currently on a 4:1 ratio but I am thinking of changing it to 3:1
Seems to work pretty well
http://www.youtube.com/watch?v=Vas5GiwSXLQ
Ah thats Inertia! So 2 900's it is then. Is the 4:1, if the motor does 6000 RPM the disc is doing 1500 RPM?
If the motor is at 12v, yes. If over volted, that number will increase.
Does any one know the rpm of a speed 900 on 24 volts?
Would it be double with 13,000 rpm? And thanks for the help so fat
If you double the voltage, you double the rpm and quadruple the torque. Or so I believe.
A Speed 900 at 12V gives 6500rpm unladen, so yes at 24V it will be 13,000rpm.
Using two motors won't increase the destructive capability of the spinning weapon (how much energy is stored/dispersed) but it certainly does help with spin-up time and also with keeping the disc or drum turning during/after impacts.
I made a dual Speed 900 drive for a disk a few years ago.
Ended up in Prodigy Evo.
Was rather impressive at 24V.
Ok thanks every one for your help, I think I know what I'm doing now
Are these the speed 900 replicas? If so, has any one got any experience with them? Are they as powerful and as fast as they say? And can they be over volted? Thanks, as this may help up, cheapen your new robot... Or should I stick with the good old reliable proper speed 900s? And any recommend any good speed controlers for it? A know the scorpion xxl would work, and the demention engineering duke thingy (scientific words I know) but is a cheaper alternative? Like a good quality controler? I think electronises are like £60? And I think I saw the scorpions for that price? Thanks
http://wap.ebay.co.uk/Pages/ViewItem.as ... rect%3Doff woops i forgot the link! :/
i originally used speed 900s on 24v with a angle grinder gearbox, old vid attached. it was about 4 years ago.
If your going with a hardox disk, go single toothed, robochallenge balanced mine, much better with 1 tooth.
http://www.youtube.com/watch?v=TlFBuJjI ... rofilepage
Woah, powerful disk... But I was actuly going to use it as drive.... Maybe two of the cheap ones per side, which is 2 wheels, which means if one burns out with unreliability, then I wil still have some drive... And if it gets to heavy, then I will remove one motor...
That was the setup I made with the 2 speed 900's driving a teethed beld trough a custom gearbox based upon 2 anglegrinders .
completely pointless. It won't deliver the majority of the power to the ground and will be wildly uncontrollable with only two wheels and that much power.Quote:
Maybe two of the cheap ones per side
Would it really be to much? I was going to use 8 blue wheels 4 pairs, to give like 4 wheel drive, but with extra grip... I might just go for the proper ones and have 1 per side then....
You can't get the torque to the floor.
Ok, just checking thanks
Quote:
Originally Posted by maddox10
would like another one making :proud:
Can with a steel floor :PQuote:
You can't get the torque to the floor.
Yep, but how many events/arena's with a steel floor are there?