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Topics - Ravi_B

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1
Event Videos / Bot Brawl Event #1
« on: November 02, 2015, 12:21:56 pm »

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North America / Great Canadian Bot Brawl
« on: April 29, 2015, 10:59:50 am »
This is a new entity in Canada.
Our first event will be September 19th 2015 in Kitchener, Ontario.
This single day event will be a public exhibition at a much larger maker based event. I cannot announce the location or host event just yet but I'm sure you can figure out what 'maker based event' means.

Our first event will feature 150lb and 30lb sumo robots. The format will be very similar to dragoncon, weapons are permitted but only to a certain extent.

http://botbrawl.blogspot.ca/

Check us out. We hope to build and grow a local community of builders, hopefully moving into combat type events.
While we have a forum set up for our purposes there is a direct to SPARC.tools on the welcome page.

3
Progress Reports / All Black Robotics
« on: March 20, 2015, 04:51:14 pm »
Really this is all to keep me honest and progressing. Those who know me understand I have a fatal flaw where I begin a bot...do some work...then ignore it the week before the event and just generally bung it up.

That said, I'm building for NERC's Franklin RIGHT NOW!!

I implore you to poke me when progress slows.

So....K-onstant
A spring powered hammer 30lb sportsmen.

Did a proof of concept build 2 years ago and generally things worked. The system uses a compression/extension spring to store power which is used to swing the hammer. The spring is then tensioned through a retracting mechanism and latched in place.

*cool note: The hammer head is cast steel! Because I work at a steel foundry and its awesome. Plenty strong, cast iron sucks.
Theres a mold design image below for the new hammer.

Attached is a picture of the proof of concept.

A big issue with the previous design was there was too much involved to manually re-tension the system while in a fight. So I have since built a little automation rig and the fire-tension system is all handled through an Arduino. The arduino waits to see if the hammer has fired (external signal from TX) then resets automatically after 1 second (timing may change). It will continue this process until a failsafe condition is reached (signal from TX or RX signal failure). There are a few sensors on the system for feedback, for precision a set of stepper motors (I know) are utilized to run the mechanism which is cam based.

The New Build

The whole thing is drawn up (pictures attached) and I've already cut the frame rails from UHMW. According to solidworks it sits at 28.6lb without wires and a few fasteners. I will be utilizing a few FIRST/VEX parts in the build including TalonSRX esc's (Team Canada's new standard).

Drive:
-CIM mini motors (1 per side)
-Talon SRX esc
-2.5:1 gear ratio (#25 chain)
-4" Diameter hex bore colsons
-4 wheel drive

Weapon:
-Mystery spring (for now)
-Hammer
-Self tension system

Some images are attached, a few things have changed in the CAD since these pictures.
The build begins.


 

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