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Name: Nuclear Ferret
Shape: Box with wedge at front
Colour: Black
Speed: 12MPH
Weight: 13.6KG
Armour: 2MM Titanium
Drive: 6 Mini EV motors
Power: ?
Locomotion: 6 wheels
Ground Clearance: 1MM
Turning Circle: 0
Dimensions: ?
Weaponry: An electric linear-actuated lifting arm like Biohazards
Srimech: Invertible
Strengths: A featherweight version of the most successful robot ever, quick, good weapon
Weaknesses: Access denied
Its a good idea. there was one similar. well it had a lifting arm :p Bio-Storm
http://www.roamingrobots.co.uk/?pages=robot&id=1055http://www.roamingrobots.co.uk/?pages=robot&id=1055
also it has 2 Wedge Of Doom style scoops, 1 on each side of the lifter
A featherweight version of the most successful robot ever, quick, good weapon
what Sewer Snake :proud:
Is this a good idea:angry:!, im itching to start
First off, Ben, are you sure that you are entirely ready to start? I mean, a dangerous step in the dark is not a good thing; you really have to know all the safety procedures involved, as well.
Ben do you have any pictures or drawings? Its one thing to read a design on paper but the saying a pictures says a 1000 words is very valid with robots.
I would increase your ground clearance around the machine to around 5mm and have it either zero or 1mm on the scoop. I learned this one the hard way in the arena a while back when the floor was chewed up. That was with hornet 1....back in the day :)
Ben, I would use less motors. 6 motors (7 if you count the one on the lifter) takes up a lot of space.
And with six Mini EV motors youd be looking at six separate gearboxes too, adding unnecessary cost to you project. Go for two drive motors (through gearboxes) and geared down to six wheels, like the setup Pain in the Asp runs
And echoing Garys statement; even on the quality of floor that is the Robochallenge arena, 1mm may well still be leaving you a bit short. All you need to do is get wedged up another robot (even just a little bit) and youre stuffed. Happened to me twice at my last competition, and thats with a 7mm ground clearance.
The whole low ground clearance thing is typical in vapourbots where floors are always seamless and as smooth as baby bottoms. :)
For a real featherweight Ben, try to keep only the scoop to the floor and leave some space at the sides and back, or you will get beached from time to time.
Driving robots over babies bottoms? There has to be a law against that :proud:
Theres no mention of it in the FRA rules. :mrgreen:
Right, going to use 2 S28-150 Magmotors or 2 Ame 12V blower motor, both weigh about the same as the first motor setup
Q: Which motor and gearing should i use
A: Please fill this box
speed 900 on an 8:1 ratio
2 magmotors for drive in featherweight?
Ben I dont mean to sound patronising (spelling?) but is this a vapour bot or a real feather?
I struggled to fit a magmotor into hornet 2 to power the disc with the battery and speedo requirements of such a motor. Then there is the cost. Can you afford to potentially have 2 magmotors destroyed or damaged in the arena?
Magmotors for drive are far too powerful and will only needlessly spin the wheels. Go for a proven drive train, 2 or 4 drill motors with wheels attached to the ends. I use it in hornet 2 and apart from a plastic gearbox taking a direct hit and needing replacing i have yet to have any serious problems.
vapour gary. its not the first time he has done a thread without any intention of building a robot.
Ive been skeptical about Bens motivation towards building an actual robot from the beginning. :P
No, I am going to build it
Ben, even dicounting what Gary said about not being able to put the power down in 13.6kgs, I with a full cnc workshop wouldnt try to build a gearbox for a mag in a feather. To build one capable of delivering the power to the wheels in an acceptable weight would be very difficult.
But if you are insisting on trying then MOD1 gears minimum. Plus you would be better off with golds, astros or speed 900s much better for feathers.
im putting some mags in drive for my heavy and that will still spin the wheels with all the weight on them, so on a feather you have no chance it will just spin up like pillow torque used to.
even if you could get a gearbox in weight etc, the gears would after be bored and pocketed so much they would brake with the power of the mag
The featherweight Battlekits seem to be able to make 2 S28-150s work, to be fair - admittedly they use chains rather than gears, but its not an impossibility.
I do think though youre not taking reality into account when planning this - you seem to not have made any considerations for budget or indedd practicality.
I think it would be a good bet just to buy 2 cordless drills Ben, then you get the motor, batteries and drive train (?), and its cheaper too
BTW Joey wahts a featherweight battlekit?
http://www.robotmarketplace.com/products/battlekits.htmlhttp://www.robotmarketplace.com/prod...attlekits.html
Size: 10X35X45
Have you actually taken into account where youll get the parts for this? Or how youll afford them?
ben what parts for your feather do you actually have just out of interest. also you said you were going to build a heavyweight robot too so you really have got your work cut out.
none, and I have given up on the heavyweight,
Also, whats the best way to make a chassis for a feather?
The best way to build a feather if your starting out ..havent much engineering experience and little money has been posted numerous times.
I think this is rapidly becoming a fairly pointless thread.
I grant you that a Mag powered feather is not impossible, but it would be an extreme technical challange even for a very experienced engineer, and then the result would be very questionable with regard to chassies strength and armour.
As Woody quite rightly states, to your last question, this subject has been done to death elsewere.
Mr Read, do you wish this thread to be closed and removed?
Ben, if you dont have a full machineshop at your disposal, you have a weight/money issue
Were doing the 1 shop stop in this. Robot marketplace is a suitable webbased shop.
2 magmotors S28/150. 3.5kg Pricetag £322
2 gearboxes capable handling the power with a suitable gearratio,
http://www.robotmarketplace.com/products/TW-TWM3M.htmlhttp://www.robotmarketplace.com/products/TW-TWM3M.html
Weight 4.4 kg pricetag £492.5
To get the power to the motors, you need batteries that can deliver at least 200amps without transforming into magic smoke.
2 sets of the 24V 2400 mAh NiCD Battlepacks should be capable. £133 weight 2.4kg
For the same weight you can have the NiMH 3300mAh packs, but then you pay £150
Speedo, Roboteq is going over 100A (and the mag S28/150 can draw up to 280A). £274 weight 1.4 kg
Grand total. 11.7 kg without wheels and £1222
To compare, the KOS Astroflight motor/custom build planetairy gearbox/motor in wheel setup with Sidewinder speedo and 13.1V A123 cells is the same pricetag, for 4.5kg all in.
And the Speed900/MSR gearbox combination with 13.1V A123s and Scorpion XXL speedo is £500 for less than 4 kg.
I think i might use 6 drill motors
(Message edited by neontetra23 on August 30, 2008)
Youre not taking this seriously at all, are you? :P
I am!
6 drill motors is a hell of a lot, you know. Its not impossible to design a featherweight with that many, but it would definitely be more complex than with less motors, not to mention more time-consuming and money-consuming. Can you seriously say you would be up for something like that? :P
ok what about 2 speed 900s
Ah, the motors that I wanted but never got... :P
Those are in deed some good motors, and Im sure people here can tell you all about those Speed 900s if they havent already.
2 speed 900s at a good ratio will give you a seriously good drive and just belt drive to 6 wheels gear boxes are easy to make aslong as the ratio isnt to high
thinking of using 2mm diamond plate as armour
Are there any featherweight crushers?
Yes
Ben, seriously try out with a rammer first; much easier than other FWs.