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 Hexxus beetleweight in progress

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Koolaid64
Camden W
SamM
Dan Curhan
FingerTech
Cody
Evan Steeves
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

Hexxus beetleweight in progress  Empty
PostSubject: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 19, 2011 10:37 pm

So after coming dead last at robogames in the beetle class...

im out for revenge! Heres what im working with:

Chassis: 1/4 6061 with topographic cuts after components are placed

Electronics:
b16's with timing belts driving two inch wheels
fingertech tiny escs for drive
castle hv50amp esc for weapon motor
e flight power 15 outrunner for weapon motor
thunderpower 850mah 45c 3s lipo

Overview:
It's going to be a horizontal bar spinner to put all of these verticle discs in check Rolling Eyes
so im going to overdrive it from the outrunner to my bar pulley by about 10% so under load with the 8" bar im shooting for 10k rpm
so the bar weighs 7oz
if I spin it to 10k with an 8" dia I have 238mph or 349 fps
applying these two I am left with
1069joules or 785 foot pounds cheers


heres where im at so far

8" long 1-1/8" wide by 1/4" grade 5 titanium bar
7075 aluminum hubs
22mm bearings
8mm grade 5 titanium deadshaft
Hexxus beetleweight in progress  Hexxus1



and the rough layout with the bottom plate
Hexxus beetleweight in progress  Hexxus2
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Cody
2000+ club
2000+ club
Cody


People Skills : 7784
Registration date : 2009-03-16

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 19, 2011 10:39 pm

Cross bracing is the key to that style frame. Take a look into Thomas Kenny's Misdirected Aggresion for some ideas
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 19, 2011 10:50 pm

thanks cody I had seen a hobbyweight that looked similar to last rites but wow that beetle is badass I like how he used his motor mouts as frame struts

I was going to use a little bit of woodworking tricks to get the frame stiff like cutting pockets and threading into the side and top but he seems to have gotten away with only using top and bottom mounting the plates scratch

research i must....
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeFri May 20, 2011 12:08 am

good point alex i vaporized a magnet in my 400 motor testing it against a brick with my old ant forgetting the magnets are factory stamp licked in place... also i noticed e flight switched to a lower grade neodymium on thier outrunners Sad my old park 480 produces 278 watts on a 3 cell with a 10x5 prop
the new one produces 247 Evil or Very Mad

so for my power 15.... idk yet I dont have the right prop to meter it yet but im ready to be sad, if i can make weight I have a mean old power 25 that I know makes a real 700 watts on 4s
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeFri May 20, 2011 12:19 am

I was testing with 4s before combat and competed with 3s i used the 6110e and ran one fingertech with a bec and one without and also ran the bec from my castle hv50 so i had something like 4-5amps to the reciever at 6 volts pwm output i should have disable one of the tiny escs bec but i overlooked it and it didnt seem to hurt anything thankfully
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeFri May 20, 2011 12:28 am

lol yes ice 50 I get all the casle air stuff mixed up.

what did you and kurtis figure out?
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeFri May 20, 2011 12:39 am

ahhh interesting.... i usually disable the bec's on the tiny escs and use the castle esc bec so I never had that quirk but I can totally see how that would make for some gremlins.
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FingerTech

FingerTech


People Skills : 4739
Registration date : 2011-04-29
Age : 42
Location : Saskatoon, Saskatchewan

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSat May 21, 2011 11:04 pm

I wish people would post what setups they used in the website reviews. I'd love to compile a list so that we could say "your setup matches the one this guy has, except for that one component" and thus figure out what combinations cause trouble and why!
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http://www.FingerTechRobotics.com
Evan Steeves
great contributor
great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun May 22, 2011 12:46 am

FingerTech wrote:
I wish people would post what setups they used in the website reviews. I'd love to compile a list so that we could say "your setup matches the one this guy has, except for that one component" and thus figure out what combinations cause trouble and why!

of course kurtis Very Happy
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Dan Curhan
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Dan Curhan


People Skills : 6339
Registration date : 2009-03-14
Age : 32
Location : Sarasota, FL

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeMon May 23, 2011 12:41 am

TADA!

Hexxus beetleweight in progress  Cimg0010
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http://666bots.blogspot.com/
Evan Steeves
great contributor
great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeMon May 23, 2011 10:46 am

A BIG thanks to dan for helping finish my blade hub !!!! Very Happy
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Evan Steeves
great contributor
great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeTue May 24, 2011 10:01 pm

made some more progress today,

cut 20 something inches of 1/4 6061 with a jigsaw and a dull wood blade it wasnt fun but the results are nice after some dremeling.

Hexxus beetleweight in progress  Hexxus3


things changed
1. no more heavy b16's instead I will be running silver spark motors
2. wheels wont be direct to motor shaft but instead will have thier own shaft and bearings
3.motors will have 3rd bearing blocks incorperated into mounts and will drive wheels through inverted timing belts to reduce shock loads

things left to do...
1. lose 6-8 ounces on each 15 ounce plate
2. make bearings blocks for wheels and motors
3. cut delrin for motor mounts in conjunction with polulu mounts
4. isolate weapon motor with thin carbon fiber so theres no rotating belt near my electronics in case the belt gets cut
5. make side plates out of aluminum or lexan
6. shock mount all electronics
7. mount belt tensioner
8. drill and tap 40 something m3 holes
9. if I still have weight I will use a 1/16 s7 plate to armor the sides and the front pulley

and heres a new rough layout teaser
Hexxus beetleweight in progress  Hexxus4
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SamM
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People Skills : 5356
Registration date : 2009-12-22

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeWed May 25, 2011 12:32 am

Looking good. I look forward to fighting(and watching) the horizontals this coming GCRS.
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Evan Steeves
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great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeWed May 25, 2011 9:58 pm

SamM wrote:
Looking good. I look forward to fighting(and watching) the horizontals this coming GCRS.

thanks sam im drawing some of my inspiration from lefty with the pully running directly on the motor can, it's almost foolproof with how simple it makes things.
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SamM
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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 26, 2011 4:36 pm

I should warn you that one of the problems we're running into is magnet survival. We went through two cans at NRL nationals on Brain which has a nearly identical set up to Leftie. Filling in between the magnets as Alex suggested may help with this.
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Evan Steeves
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People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 26, 2011 10:29 pm

Did the can flex? And did the magnets come unglued or sheer ?
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SamM
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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeThu May 26, 2011 11:56 pm

As best I can tell, the can flexed and the magnets hit the stator. Some shattered and some just came unglued. While the simplicity is nice, if the survivability problem isn't solved it may not be a good way to do things. That being said it likely depends alot on the construction of the motor, and your motor is the same diameter and shaft size that we're running in The Brain but in a 3lber.
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Evan Steeves
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People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeFri May 27, 2011 12:08 am

well that makes me feel somewhat better.... ill still 24hour epoxy the magnets for good luck.

the brain hits freaking hard for a motor with a 5mm shaft affraid
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Evan Steeves
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People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSat May 28, 2011 11:50 pm

made some more progress tonight. I mounted the weapon motor and the deadshaft and did a small spin test, well at 1/3 throttle im at 4700 rpm so im thinking it may be alot smoother through the air than I anticipated leaving me with a higher top speed cheers

everything spins super smooth too im really happy with how this is working out


Hexxus beetleweight in progress  Hexxus5
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Camden W
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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun May 29, 2011 4:27 pm

wouldn't it suck to drop your camera while it was spinning? tongue
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Evan Steeves
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People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun May 29, 2011 9:38 pm

it definatly would lol its scary just to be around I wont even try it beyond 1/3rd throttle incase it explodes Laughing
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Koolaid64
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Koolaid64


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Registration date : 2009-07-05
Age : 33
Location : PA

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun May 29, 2011 10:30 pm

ha i tested a version of szalor like that before, took it to full throttle fine, when i let off it freaked out, flexed and ate the frame. my bar dead stopped in the cf about 1 1/2" in =P

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Evan Steeves
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People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun May 29, 2011 10:41 pm

Koolaid64 wrote:
ha i tested a version of szalor like that before, took it to full throttle fine, when i let off it freaked out, flexed and ate the frame. my bar dead stopped in the cf about 1 1/2" in =P


thats exactly what I was afraid of when I let off the throttle the belt started jumping I can totally see how it would try to eat itself if it was just a little faster I shure as hell dont want the 9oz titanium bar flying off my worktable at those speeds that would need some serious super glue and peroxide attention for the puncture it would leave in my leg lol
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Evan Steeves
great contributor
great contributor



People Skills : 5091
Registration date : 2011-02-05
Age : 33
Location : towson md

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun Jun 12, 2011 7:58 pm

made some more progress this afternoon i broke out the jigsaw and some fresh blades, some saftey glasses and went to town...


kitty for scale Very Happy


Hexxus beetleweight in progress  Hexxus66
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Jamo_G

Jamo_G


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Registration date : 2009-07-12

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PostSubject: Re: Hexxus beetleweight in progress    Hexxus beetleweight in progress  I_icon_minitimeSun Jun 12, 2011 10:06 pm

No pulley on the motor can? Looks great!

-Jamo
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