Name:
uMBX or micro Melty Brain eXperiment
Weight:
~150gram
Length:
90mm
Width:
90mm
Height:
34mm
Drive:
1 x Venom Fireball Micro Speed370P with Banebots 34mm Green wheel.
Controller:
HobbyCity T4A RX with Pololu Baby Orangutan B-328 controller and 250G accelerometer
Battery:
2S 350mAh or 400mAh LiPol
Weapon:
Translational Spinner (~150gram @ 4000rpm) with two Titanium teeth.
Armour:
3mm HDPE and 1mm Carbon Fiber
While I'm still sourcing parts and polishing design bits off for the next featherweight melty brain, I've started work on uMBX, a antweight melty brain. I've taken a rather shine to the antweight class due to the ability to build and battle them on my kitchen table and the parts are so cheap! Once finished, I'm planning to ship uMBX off to the UK for Joey McConnell of Team Picus Robotics to enter into one of the Antweight World Series events.
Today the first batch of parts turned up, so I decided it was worth starting a little build thread.
4 x 350mAh 20C and 4 x 400mAh 20C Zippy LiPol cells.
Just waiting for me next order of parts including hobbycity radio, carbon fiber and Vemon motor.
EDIT:
Decided to turn this thread into an antweights thread since I started a quick "parts on hand" antweight tonight.
_________________ https://www.halfdonethings.com/
Last edited by Knightrous on Thu May 10, 2012 3:46 pm; edited 2 times in total
You didn't mention how if you can get this one to work that hopefully MBX will do more than spin and kill gyros. _________________ Steven Martin
Twisted Constructions
http://www.botbitz.com
Mon Feb 08, 2010 9:42 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Packs nearly finished, just need to workout what connectors and balance plugs I'm going to put onto these batteries.
Sending off quotes in the morning for getting the chassis and carbon fiber parts water jet cut. With some hope, it might be close to complete by beginning of March.
quote:Originally posted by marto:
You didn't mention how if you can get this one to work that hopefully MBX will do more than spin and kill gyros.
New MBX or whatever I decide to name it will use a different control system, I'm using a more mechanical system this time that 'should' be more reliable for translation. The motors will also be able to run 100% flat out all the time, so I won't lose power potential due to low duty cycle. Anyway, new MBX/whatever will get a thread when it evolves past a POP and solidworks renders. _________________ https://www.halfdonethings.com/
Mon Feb 08, 2010 10:55 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
More parts arrived today and the inwards guy at work asked me if I'm importing drugs from China
Pair of 2S 360mah 20C lipol packs, 1mm carbon fiber, 3S 1450mah Lipol TX pack and a HobbyKing T4A 2.4Ghz radio.
While I wait for the water jet parts and my programmer to arrive for building uMBX, I decided to knock up a quick little antweight out of some parts on hand.
Currently 108gram in cardboard + tape config. Should be able to lose another 5-10grams by trimming the plastic off the servos more. Hardox wedge is about 25grams worth, so that leaves me around 15grams for the chassis, which looks do able!
Test drove it earlier, it's stupidly hard to drive, cobra style. Going to have to fiddle with the spektrum rates to tame it. _________________ https://www.halfdonethings.com/
Wed Apr 07, 2010 10:51 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Waterjet parts arrived for uMBX today!
Will see how it's going weight wise when I get home, but should be underweight by a small amount. _________________ https://www.halfdonethings.com/
Last edited by Knightrous on Thu Apr 08, 2010 5:43 pm; edited 1 time in total
Thu Apr 08, 2010 2:49 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
16grams of weight to play with. Just need to make up a pair of teeth, the fet switch for the motor and a different hub for the wheel. Should be able to do that in 16gram . _________________ https://www.halfdonethings.com/
Thu Apr 08, 2010 5:41 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
More work
Glued the two chassis halves together. Then tapped the carbon base, mixed up some glue and epoxied it to the chassis, used servo bolts to tighten it all up while the glue set.
Why didn't you get teeths waterjetted?
Cost much? Looks sexy...
EDIT: and you have the same phone as me, wooo they have like 1 day battery XD _________________ ( •_•)
quote:Originally posted by dyrodium:
Why didn't you get teeths waterjetted?
Cost much? Looks sexy...
EDIT: and you have the same phone as me, wooo they have like 1 day battery XD
I'm still half designing the teeth. working out what materials and stuff to make them from. Cost me around $40 for the whole lot, which is enough parts to make two complete bots. would have been a little cheaper if I didn't have to make the chassis out of two layers of HDPE.
To cut down on the amount of wires, I've designed to mount the B328 board on top of the receiver. So I whipped up a quick adaptor board.
It should all look a bit like this when assembled
Unfortunately the adaptor is a double sided board so I'll need to send it off to BatchPCB to get made, which could take a week or three. There is also the issue of not being able to find the little 250G Sparkfun accelerometer I bought just for this project... $40 to get another one if I can't find the sucker...
Might not be ready for The Edge Workshop at this rate might just have to macgyver a few bits. _________________ https://www.halfdonethings.com/
Thu Apr 08, 2010 9:49 pm
DumHed Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
if you can send me PCB files I can probably make the PCB for you
You'd have to solder both sides of the pins because it wouldn't be plated through though.
Cheap option if you need it anyway _________________ The Engine Whisperer
- fixer of things
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