Yeah, mine is gonna be 100 grams over weight when it's built... So I'm going to get a smaller battery...
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Yeah, mine is gonna be 100 grams over weight when it's built... So I'm going to get a smaller battery...
Since this thread has been rather quiet for a while I thought I'd upload a test drive of Spinza.
http://www.youtube.com/watch?v=4nujd67nH0I
Rabbits not included.....
So that's what happens if you sit on a beetleweight :PQuote:
Originally Posted by PJ-27
Eh?
How are other people's Beetles coming along?
almost done, just need front armour and the weapons.
armour is 12mm hdpe and 6mm polycarbonate
weapon is a lifty graby thingy
Any news on the arena?
my beetle is also going quiet well, armour and frame is pretty much complete, and i have neally found the parts for a pnumatics flipper system, but it looks like its going to be over weight... :sad: so i may need to stick a basic walker system on the back, so i get the extra weight alowence...
Hey alex Ive got a walker mechanism we could use and also check your pm's
What motor is 180 using to achieve 17k rpm?
The brushless in Spinza does about 6000 rpm with a 3:1 reduction and I'm right on the weight limit.
I was wondering if any one is taking there beetle to Worthing? Because it would be nice to have some proper Beetle fights!!!
yep
Video of a spin test of Spinza:
http://www.youtube.com/watch?v=7iE6VN8MhZU
And a couple of photos of it assembled:
http://i1228.photobucket.com/albums/...inzaTopOff.jpg
And the blade assembly:
http://i1228.photobucket.com/albums/...adeAsembly.jpg
Looking good guys, nothing like spinning up a weapon with a brushless motor to scare the brown stuff out of you!
Out of interest, what brushless motor are you using? There are so many available that could work in a BW that I don't really know what to go for, so a benchmark from another robot would be handy :)
Also, you still having problems with the torque of the MFA motors struggling to turn Spinza? I've ordered some of the 1000rpm gearmotors from eBay to replace the MFA motors in Paws* so it'll be interesting to see how they compare and whether they're powerful enough to be a good alternative for your drives (plus they're cheaper than the MFAs, just take a bit longer to arrive)
*I'm not changing mine due to performance, they're just easier to mount with the chassis design I have in mind :)
Looks cool!!, how big is the robot??? looks twise the size of 180 :)
@Jamie:
Thanks!
I never used brushless or Li-Po before, let alone both together! So was a rather scary moment. Currently on a 2.7:1 reduction and it doesn't spin all that freely (watch how short the spin down is) so I think I can get a little more out of it.
The motor is this:
http://robotbirds.com/catalog/product_i ... ts_id=4527
It's the most powerful they had in stock for that price and size.
The MFA's aren't great. I solved the problem a little by adjusting a mixing quirk of the Sabertooth, but it still struggles and I have to keep the electrical tape on the tyres. I think the odd wheel placement and fat tyres are the main problem, since straight line speed is pretty good, not as nippy as I'd liked though.
Let me know what the gear motors are like, if they're more powerful then I may look into changing.
@Kenny:
Cheers!
Its 520mm at the widest point and the blade is 320mm. Having not seen anyone else BW in reality I dunno how that stacks up.
It's right on the weight limit, and I think the last few nuts and bolts are going to tip me over.
Any news on the arena?
im thinking of using one of these for a BW FBS but im not too sure how i could do it
[quote=@Kenny:
Cheers!
Its 520mm at the widest point and the blade is 320mm. Having not seen anyone else BW in reality I dunno how that stacks up.
It's right on the weight limit, and I think the last few nuts and bolts are going to tip me over.
Any news on the arena?[/quote]
180 is only 230mm long inc the disc and is only 40mm tall, how tall off the ground is the blade?? also is they armour covering the parts?
the arena is in storage until me or tom have the time to finish it, we need to get the polycarb for it but considering the polycarb will be around 800-900 pounds its not for abit, also the arena isn't being built to put on shows its only for roboteers to have ago at building and destroying stuff in a safe environment and isn't being done for profit
Spinza is 100mm tall and the blade sits about 10mm off the ground (its upside down in the tests, but runs in inverted).
Yeh there's a HDPE cover that sits over the top/bottom as armour.
Be-jesus! That's a fair emount....Quote:
the arena is in storage until me or tom have the time to finish it, we need to get the polycarb for it but considering the polycarb will be around 800-900 pounds its not for abit,
Sounds perfect. Will it be brought to events then?Quote:
also the arena isn't being built to put on shows its only for roboteers to have ago at building and destroying stuff in a safe environment and isn't being done for profit
Looks good, nice and original. True about the hugeness of it though! =p
Haha, we seem to make a habit of making our robots too large.... I may have the shave some weight off somewhere, I think once all the nuts and bolts are in place it'll be 100g over.
How much does the disk on 180 weigh?
Yes it will be brought to events when its done,
disc on 180 weighs 650g and the chassis with everything also weighs 650g :)
650g!
My motors, esc's and battery weigh more than that! How on earth did you make a running robot with chassis and wiring for 650g!
What's your chassis made of? Might want to use plastics for that size. Also the MFA's are pretty heavy if I remember correctly?
i know its a rule to not have a weapon but ive seen that you need to have the intent for damage so what about using those motors that PJ is using for his spinner for a full body hammer? how would that go down?
My chassis is 1.9mm Ti, grade 4. Weighs around 250g I don't think I could do that any lighter given the shape and size.
The motors are 80g each which doesn't sound like much, but could do with being more powerful.
@Matt the Brushless I'm using has an impressive RPM but not much Torque so I don't think it would fair well for drive, plus bi-directional brushless ESC's are expensive.
then spinner it is :)
Ah ok, nothing's going to touch your chassis then, OK well maybe 180. Is it invertible as-is?, hard to tell from the picture with the blade on.
@Matt, how many robots are you planning on building?!
The HDPE may be a little vulnerable and the wheels are exposed, infact I think it's weakness will be horizontal spinners (so 180..) but as long as the blade is spinning hopefully nothing will get near.
Yes it is invertible, at the moment the bolt the blade is mounted onto is too tall so when the bot is upside down / right way up, this touches the floor before the wheels. I wanted to keep it that way for the test so I could get at least 2 nuts on and reverse crank them. Really didn't want to blend the cat....
But for the finished version I'm putting a split pin through the top nut so I can trim it down. The whole structure chassis and blade is shorter than the diameter of the wheels. I'll upload a photo soon of it fully assembled.
ive got a few in mind. ive got 2 fw's, probably a third, then maybe a bw, thats all im planning for now
All!!?
i dont spend my cash on much else other than my reptiles so why not :)
How many of these are finished? Pictures?
one is finished, one is near compleat and the other two are just designs right now
If it's gonna cost £800-£900 for the polycarb, and it's us roboteers that are going to be using it, I think a whip-round could be in order. Everyone who plans on fighting with beetles in a beetle arena chuck in £20-£30 or so towards the cost of polycarb and we can get some battles going :proud:
Quick question: I bought some of these.(Click here) What sort of batteries should I be thinking about for them? The robot shall be having a servo powered lifter as a weapon.
And if I got something roughly looking like a beetleweight going, I would be more than happy to give some cash for the Polycarb.
Matt, beetleweights must have an active weapon so not a ram bot. A rambot wouldn't be effective anyway in the current arena.
ah ok, it seems a very spinner dominated catagory though
that's because spinner is the mot effective weapon for use in the current arena
They do the most damage I guess :lol:
Yes, but mostly because there is no arena to full out of, so you can just pin-ball around inside a polycarb box. Plus the scale factor is immense!