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Topics - roybrox

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Because things didn't go badly last time and I can't learn from my mistakes, we'll be having our 6th MassDestruction in two years at the end of January!

The Charles River Museum of Industry has been hankering to have robots for a while and now thanks to Connecticut Yankee Screw Machine Salesman, you can display and fight your electrical toys right next to steam-powered machines that pre-date transistors! The very cool museum has dozens of antiquated but still running tools and toys from automatic scraping beds and model T's to watch lathes and ride-on trains!

We'll be coordinating via Facebook again, and expect a registration via Eventbrite to go out soon:

https://www.facebook.com/events/149911915489892

Spectators are as always welcome, although you will have to pay admission to the museum in the first place.

Robonerds - I should have the Eventbrite up today or tomorrow. Catagories are once again:
1lb
1lb Plastic
3lb
12lb Sportsmans
Please see NERC for generic rules (http://www.nerc.us/rules.html).

MassD Unique Rules:
Plastic Ant: The vast majority of construction elements in your robot must be made of plastic. This goes especially for weapons and armor. Carbon fiber, kevlar, and fiberglass are not plastics so you should not put them in your robot. 3D printing is heavily encouraged, but not required. No fiber or epoxy reinforcing allowed on prints though, or chopped-suey carbon fillament!

12lb Sportsman's: To continue to see the growth of this class, the active weapon requirement and anti-wedge clauses are once again removed. However, kinetic energy weapons are still limited and you'll totally get more points if you do have an active weapon and no wedges AND if you hastily make everything from Harbor Freight parts the night before. What good are the points? Not really much, maybe to avoid the....

Wheel of Misfortune: I'm bringing this back but better this time. If your robot is marginally overweight or somehow offeneds me, the judges, or the audience, we will make you spin the "Wheel of Misfortune".

All standard NERC rules will still apply, and we will try to have a testing box in the pits. Let's keep being safe here!


Tournament Structure:
We will once again be running our modified-Swiss style of competition, ensuring every 'bot gets to fight at least 4 times. Highest-scoring four will be entered into a short double-elimination tournament to crown our winner and King (or Queen) of Denmark!

Tournament structure is subject to change without reason, but time-permitting you will be able to fight your robot at least 4 times if it's up to the task!

Scheudle is shamlessly copied from previous events:
8:00 AM Doors open. Come in, Get check in and inspected
9:30 AM Check in for combat Ends
9:45 AM Drivers meeting and match schedules distributed
10:00 AM Round one of fights start
1:00 PM Approximate lunch break for combat
6:00 PM Approximate Semi Finals period
6:30 PM Arena break down

As always, we'd appreciate any help we can get from kind volunteers showing up the night before for arena assembly or who want to serve as judges/staff for the event! We will be sending out a volunteering form in the weeks ahead for you cool people!

Any questions or concerns? Feel free to leave them on this page, or contact EOs directly at massachusetts.destruction (at) gmail. We're really looking forward to seeing you all again!

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Hey all!

We'll be starting MassDestruction Quarterly again in Boston, Massachusetts! Our next event will be at Artisan's Asylum in Somerville, MA on November 12th. Weight classes are 1 and 3lbs, $25 registration fee and unlimited spots (for now!). Event details are on Facebook:

https://www.facebook.com/events/324137631264560/

Registration will be up in the next week or so. If you have any questions, please post them here or email the EO's directly at massachusetts.destruction at gmail.

Thanks, and we look forward to seeing you!
Fred

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CAD Zone / Big Guy Motors
« on: December 11, 2015, 11:51:03 am »
Here is a CAD file for an NPC Black Max
https://dl.dropboxusercontent.com/u/32861468/Black%20Max.x_t

And here's one for a Motenergy ME0708 (E-Tek)
https://dl.dropboxusercontent.com/u/32861468/ME0708.x_t

Will update this list with a short/long mag as soon as I steal them from Charles next week. Also taking suggestions.

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For Sale / Wanted / Antweight/Saifu-esque Drum for sale
« on: June 11, 2015, 01:17:04 pm »
I was a little over-ambitious when designing my antweight "Praise Helix" and needless to say the whole design is brutally crippled by one really really bad design decision I made at the beginning (never use worm gears for drives, kids). The one thing that functioned was the weapon, and I'd like to pass on my blood sweat and tears to you.



The drum's a hollow 7075 cylinder of nominal outer diameter 1.7" (43mm) by 1.6" long with flats and tapped holes for M8 class 12.9 bolts. I went with the shiny blue ones from McMaster because they're awesome. They're about 7.5mm long and there's four in the alternating inside/outside pattern. The weapon motor is the same as Saifu's, the SK3 2822-1740kv and it is nice and properly goop'd in place (done on a lathe, so it's pretty centered on-axis). Total weight is 160g.



The design is heavily inspired by Pete Smith's Saifu v1 but I did modify the dimensions to make it suit my purpose.  It will probably not plug and play with a Saifu kit, but if you bolt it onto an RC car you might have an acceptable vertical spinner for an ant.



Asking $50 + S&H. I'll throw in a nice big handful of spare bolts and entertain any reasonable offers.

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Questions / TinyESC- Possibly Blown?
« on: January 28, 2015, 05:48:01 pm »
Hi All,

I've got a pair of TinyESCs enclosed in a pretty tight metal cylinder right up next to a pair of SilverSparks, 1 ESC per motor. I was just putting this whole thing back together when I noticed than one of the ESCs, even though it would flash with power it would not 'recieve' a signal from the receiver (R415x) and continue to blink slowly red in 'Standby' mode. I isolated the signal pin and it looks like it's connected and there's no breaks in it. Also, the BEC works just fine and it can give power to the radio. No amount of goading will get it to send signal to the motor (or even look like it's receiving). I also tried re-calibrating, but it doesn't seem like that did anything.

It looks like there's a small brown spot over Pin 7 on the H-bridge, but that could just be discoloration/wear and tear. Is there a chance that my battery shorted through the TinyESC and killed it? Has anyone had this problem before seen these symptoms before? I know there was a brief frame-grounding issue with my bot, but I was pretty sure I grabbed all the loose ends before trying to put it together this time with this new ESC.

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