If that's the issue, you may want to look into LiFe/A123 systems batteries if they specifically ban LiPo, they're much more stable and still have decent energy density.Quote:
Originally Posted by Eventorizon
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If that's the issue, you may want to look into LiFe/A123 systems batteries if they specifically ban LiPo, they're much more stable and still have decent energy density.Quote:
Originally Posted by Eventorizon
1) have it run on 2 wheel drive. Scrap the 4 wheel drive option, it will drive better with 2 driven wheels on the same axis as the disc. Gyro forces and all that. Skid plate at the back, job done, around a kilo saved.
2) Use lipo. Don't worry about explosions etc, you seem to have your head relatively screwed on so you should be fine. Regarding the rented accomodation.....don't tell them? Keep them hidden, job done.
i like the video
i noticed in its description it says your a product design student just curious as to where you are studying? as i am doing the same course at de mont fort
alex
I don't think I've ever seen a short hold tenancy agreement that mentions Li-Po's before!
Lots of good suggestions here. Can't really suggest anything on top of them, but the 2WD suggestion is the best by far. Ewan (Gimson Robotics) built a 4WD vertical spinner years ago but I remember reading on his website/through event reports that he then changed down to two wheels as it made driving easier when competing against the gyroscopic forces generated by the disc. Most of the notable vertical spinners, from Robot Wars through to today, all use 2WD, and for good reason. Also, if you can, keep the wheels as close as possible to the disc's line of rotation. Again this helps to decrease the gyroscopic effects.
Regarding lipos, I was hesitant at first as well, partly due to loads of videos of plebs on the web blowing packs up (as well as numerous vids of them going up in flames in American robot fights) but I've heard the following from several experienced people now: lipos are a perfectly safe and usable power source as long as you respect them, their limits and take the appropriate safety precautions with regards to installation and charging/discharging etc.
They're also not too expensive these days either (just avoid the extremely cheap crappy packs). Like Gary said, just don't tell the uni/landlords. Much worse stuff goes on in these places. Our halls had a zero tolerance policy towards drugs but I can guarantee you they were kicking about in one room or another.
Ian Lewis is the equivalent of a combat robot god with Razor and Warhead! Not forgetting Simon Scott and Vini Blood. I had considered shortening it and then powering just 2 with 4 motors but that i think is overkill. However I want it to be able to push (come to think of it, it seems like I want it to do everything but I know it cant!) so that I can keep robots against the disc.
I am studying at UWE in Bristol, that€™s where I make most of the parts and we also have a Laser cutter so that makes prototyping a relatively quick process.
And simply not telling them had crossed my mind but after they found my blow torch (for stone work) and my flat mates flare gun (No idea) they have come down like a ton of bricks€¦ shame really. And neither had I but the owner of the house is a mate and he knew I was into robots. He told his parents about it when he was telling them who would be in the house and they added a load of electronic stuff to the list of illicit items, along with a george foreman grill and funny putty :?
I will look into just 2 wheel drive, though I want it to look different to Inertia€¦ maybe a ramp at the back or something€¦?
I have just ordered a load of things from Ewan, 4 motors being the main thing as well as some connectors and wire so I would be interested to see his 4wd spinner
his 4wd spinner
Lies! All lies I tells ya! We use Li-Po is Bitza 2 because it was the CHEAPEST battery we could find.
If I can somewhat echo what has been said:
I'm inclined to say don't ditch the lifter on the grounds that most FW events in Britain are in fact non spinner. So the lifter is more valuable than the disc really.
So I'm with Gary on ditching the 4WD. Keep the nearest to the disc, scrap the other motors.
Make it smaller by removing the width of the motors & wedge the rear. It might spoil the looks but spinners will aim for those corners. Spinners can't hit what's underneath them.
Also design a replacement flipper that becomes an upward on the front as well. more useful for non spinner events.
Wow, that's a pretty extensive list of things you're not allowed to have in the house! If I were you, I'd move :lol:
That was actually back in 2003/2004-ish I think? I believe he then sold it on once it was changed to 2WD (to a security company if my memory serves?!). Anyway, I have a couple of pics saved from back then:Quote:
I would be interested to see his 4wd spinner
[attachment=1:3lbd0xv1]vertigo (1).jpg[/attachment:3lbd0xv1]
[attachment=0:3lbd0xv1]vertigo (5).jpg[/attachment:3lbd0xv1]
Interesting conversation here, and the CAD's look very nice
I'd personally go for an all-plastic chassis and armour, using rigid plastics like Nylon for the structural parts and lighter ones such as HDPE/Polypropylene for the cladding, this ought to save weight over aluminium. Also go for Li-Po's, they really aren't /that/ dangerous if used correctly and will provide the current you need for the weapon much more happily.
Here's what I built around 2005/6 which had been mentioned:
https://lh5.googleusercontent.com/-2...0/img_1370.jpg
https://lh6.googleusercontent.com/-k...0/img_1395.jpg
https://lh4.googleusercontent.com/-u...9/img_1423.jpg
Contrary to some of the previous opinions I reckon 4WD isn't such a bad idea- The robot above could easily push any other in 4WD and though I opted to go to 2WD to save weight for extra armour/heavier disc I don't think I would have if I'd have been able to use Li-Po's - also this was when feathers were 12kg. It's absolutely up to you though, kudos to you for making something interesting and not a box!
P.S. ahh, seems Jamie found pictures faster than me!