thanks guys :) over 30,000 views on this build diary now- crazy.
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thanks guys :) over 30,000 views on this build diary now- crazy.
Really good! Congrats!Quote:
Think its the fastest spinning weapon on a featherweight in the UK so far now .. if anyone knows the weight/OD/RPM Of touro feather in the US id like to know... as thats the kinda effect i was aiming for.
Actually, Touro Feather is Brazilian, Rio de Janeiro, but we do compete on the US (Robogames and Combots) besides Brazilian events - which by the way you are all invited to attend!
So about the numbers. The latest Touro Feather spins its 4.3kg drum at 15600 (measured, 16K theoretically). Since 2009 the drum have a single S7 tool steel tooth - about 25mm x 25mm x 190mm - counter balanced by a Tungsten bar. The tooth is profiled like an hourglass and fits on a similar shaped channel on the drum (306 stainless steel), leaving about 12mm out, then everything is welded.
There is a relation between the speed of the robot, rotational speed of the weapon, number of teeth and bite / grinding. It is on the RioBotz Combat Robot Tutorial somewhere... Any way, in 2008 it had two teeth at >20K RPM and lots of grinding.
BTW, this is one of the best topics in all of the forums I participate, congratulations!
Cheers,
Eduardo
Hey Eduardo long time no see!
The latest Touro Feather spins its 4.3kg drum at 15600 (measured, 16K theoretically).
jeez you really raised the bar there! would love to see some pictures of the latest one if possible? I take it you kept having trouble with the ali drum/s7 teeth combination even though you had the teeth dovetailed into the drum?
would love to come to the states to compete... would want to persuade a few more UK roboteers to join me though... traveling to california this year on holiday... so maybe 2014 could be a good year.
On another note.... 360 IS BACK IN ACTION;
http://www.youtube.com/watch?v=H9_fSZ0GVbk
Awesome, you found another ESC that worked?
Hello,
Loving the progress with everything so far.
Have you tried out 720's drive motors yet?
Could you tell me how you perform?
Thanks
Archie
720 has been running for a while.
http://www.youtube.com/watch?v=KiSFeRcQ-Sg
thanks alex but I kind of wanted daves (mouldy is a dave right?)view on them
having not been to many events I don't really know peoples names or faces
when I build a feather weight I will know the look of dissapointment on peoples faces as I smash their robots!
so any opinions on these banebots motors (not to hijack your thread of wonderfully machined robots)
A mouldy is a Dave yes :)
The video that Alex posted kinda answers your quetion? I'm happy with them so far... I've just supported the rear of the motor just incase.
thanks guys.
these will definitely go on the list of concideration
720 has amazing speed and torque!
does its drive run on 5s? (sorry if that's a stupid question)
What motor does 720 use for it's drum?
I believe he is the only person using a brushless In-runner.Quote:
Originally Posted by Mouldy
Drum weighs about 3Kg, on a ~3:1 ratio giving ~13'000 rpm at the drum and about a 2 second spin up time
This Motor; http://www.robotmarketplace.com/product ... N1515.html
This lipo; http://www.robotmarketplace.com/product ... SPP45.html
both of which ive just noticed have been discounted massively since i purchased them :( lol
makes buying replacements better :P
Galactus uses an inrunner.
Touro Feather also uses an inrunner to power it's drum.
Why is it that some opt for inrunners particularly? Smaller diameter? Higher RPM?
I'd have thought the greater torque from an outrunner would be desirable enough to make them steal the show?
@Megamasher
I wouldn't puy an antweight called 90 on your robot wish list' and post on this thread because it is quite likely that dave m will smash it up.
don't say I didn't warn you:)
Its exactly that. Drums need less torque and more speed and discs need less speed but more torque. Beyond that it comes down to space and dimensions. In-runners tend to be long and thin where out runners are squatter and wider; hence their different operating characteristics.Quote:
Originally Posted by Ellis
Archie2000, why would Dave M smash up 90?
Well I know that 99.9% of people on this forum are very nice but
There has been 180(beetle) 360(fw) 540(fw) 720(fw)
I think he wants to complete the family if you get what I mean.
It was meant in a funny way but since I have no sense of humor you probably took it as an offence.
Which wasn't what it was intended for.
Happy Days :lol:
Thanks i shall re-name it (as hard as that is)
Call it 90 if you want mate, i have no idea who this archie kid is, but he's not talking on my behalf.
Just thought I was doing you both a favour
sorry
A 360, 180 and 90 Picture would be cool
And Hypnodisc
Ok, thanks i will call it 90 and try to enter events with it. Just out of interest, when and where is the next antweight competition?
The antweight world series in Reading.
http://robotwars101.org/ants/antweightw ... /index.php
However you can bring it along to RR/RL events and use them in Dave Westons spinner arena
http://i1234.photobucket.com/albums/...psc4fcd584.jpg
What NST did to 720 in the playoff...
That's got to be expensive!
Damage from NST was only a broken belt really and a ding in the drum... was really happy with how it stood up in all honesty... it did its job and it won :)
however, when the belt got pulled of- it yanked on the motor shaft and bent the shaft very slightly... would still work...but i want to engineer out the weak point for next year, i will be totaly re-making the front end of brushless motor, changing the shaft from 5mm to 10mm and supporting it from the other side on bearings soon enough.
Id also like to keyway the pulley onto the shaft rather then just a grubscrew which kept coming loose.
360's disc worked well... but the upgrade to 6s has meant it kept cutting out... so the scorpion xxl will be going, and some botbitz will be going in.
720's fights
http://www.youtube.com/watch?v=nG0Yc_fzU9c
http://www.youtube.com/watch?v=WcVWoG91BmY
http://www.youtube.com/watch?v=c-TA3ZSm6AU
http://www.youtube.com/watch?v=0DTzcBk_J2U
http://www.youtube.com/watch?v=JsgFYHUEX4c
http://www.youtube.com/watch?v=76F2MY8WOwE
http://www.youtube.com/watch?v=oejfLz3Q73c
http://www.youtube.com/watch?v=lXy265pB4LI
http://www.youtube.com/watch?v=3sH-9KClEJA
360 demo (drive kept cutting out- do'h)
http://www.youtube.com/watch?v=0GhbP6EjDXA
Designed a new front plate for the motor which keys into the motor can and acts as a mounting also, its held on with 6 bolts now as aposed to 3, ive also knocked out the shaft and made a larger diamater one which ill finnish of soon...
The front plate also has holes for the new M8 as aposed to the original M5 mounting holes, so i can tighten it right up;
http://i685.photobucket.com/albums/v...ps56ca5ff5.jpg
next step is to put a keyway on it, and assemble it fully- theres no rotor internally in this picture... then ill be putting a support bearing in the bulkhead of 720 and mounting a new pulley to the shaft... i cant see this new assembly falling apart.
Old shaft next to it for referance... Thanks to Dennis for machining the aluminium.
What does the faceplate mount onto in the can? Just wondering how you managed to double the amount of bolts from 3 to 6. Or was there enough 'meat' in there for you to just tap out 3 more?
Looks good though! Are you going to support the rear of the motor also?
With that amount of support there will be little need to mount the motor rear. Nice looking bit of ali that :)
It seems that in the more extreme cases all brushless could do with a bit of work to make em more robust.
I would happily pay to have that mod done to the brushless that is going in Conker 3, cos then I would be almost certain that it would never break! Still cant choose between the Sensored Inrunner or the standard Outrunner...
Which would you have?
http://teamnovak.com/shop/index.php?...roducts_id=459
OR
http://www.scorpionsystem.com/catalo...5/HK-4035-800/
Both would do the same top speed and the sensored element should allow the in-runner to match the spin up time of the out-runner despite it having less torque.
PJ- theres not much point in supporting the back, as theres no shock going through it, the 6 bolts on the front are only to stop the can falling of through vibration now really... as the shaft will be supported on both sides, all the force just goes into the bearings...having said that i might be putting an armour mounting plate in that kind of area anyhow so i might kill 2 birds with one stone just to stop the motor ever being able to fall apart even if all the bolts should fall out.
Alex- id probably go with the scorpion just because its a good motor out of the box.... and just because a motors an in runner... doesnt mean the spinup time will be pants... look at 720/galactus for examples of that.
If your going to the trouble of getting your bulkheads machined from alu like you showed me before- id suggest making your mounting for the motor the same as the one i made for 360 ages ago... so it supports the entire front cap of the motor, with its own bearing.
I knew it wasn't going to be pants but I get your meaning. I am intending to have them done out of Al, though I am having support issues at them moment. The 2mm Ti 2 base doesn't seem to be thick enough to stop what is mounted to it from twisting. I will get some images up after the hand in on Thursday. [Might have to go thicker or pay out for grade 5/6 Ti]Quote:
Originally Posted by Mouldy
Do you have any shots of the mount on 360, just so I know what I am aiming for?
http://www.fightingrobots.co.uk/thre...pnodisc/page19
push the shaft out and put a larger dia one in, pretty easy to do theres probably online guides on how to do it.
Found a few tutorials which explain it but lacking on tools. The shaft on yours was only 6mm wasn't it? The Hk-4035-800 can have an 8mm shaft. If I support it in the same way as you did on 360 then it should be fine. Might work out a way of supporting both ends.
Edit: Also cos of the way a Brushless is assembled, I don't think you can widen the shaft very much. It might be better to just give it good support.
Been ages since I put anything on here...
Started to machine a complete new drum out of a solid 3inch grade 5 titanium bar and started to machine new teeth for it too from Hardox 500... Both take ages to machine... And I don't have much time spare at the moment due to just buying a house... But when I get chance ill stick a picture up of the progress... The main advantage of the titanium will be more energy in the weapon... And the Hardox teeth should stay sharper for longer. I was only running soft stainless steel teeth at the champs :)
The new motor end cap/mount combo with larger supporting bearings has been finnished... Thanks again to ed Wallace for doing a bit of the machining at work... As it had to be mega accurate...
http://i685.photobucket.com/albums/v...ps869f1822.jpg
Kinda hard to see how much works gone into it from the picture... But this coupled with the new drum should give 720 even more reliability and 37% more energy in the drum for next year (not that it needs it lol)
Not doing things by halves then eh?