FIRST ROBOTICS: Design Strategy Webb Institute 11/03/2013.

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Presentation transcript:

FIRST ROBOTICS: Design Strategy Webb Institute 11/03/2013

FIRST Games Main objective is to score points Usually there are too many tasks for a single robot to complete on its own Usually 2 minutes (time is a problem)

5 Simple Steps to Design 1: Know the game 2: Know your limits 3: Pick your parts 4: Make tradeoffs 5: Work the details

Step 1: Know the Game Read the rules – Read them again Look at every method of scoring – Even the crazy ones Freshmen come up with Look at all means of defense Run practice matches in your mind Develop strategies, then look to defend them Ask how commonly each strategy will be played?

The Easy Win A “Chokehold Strategy” – A strategy that will always end in winning independent of your opponent FIRST does not like this – Look out for the Q & A or rule updates Case Study: Team 190 in Overdrive

Case Study: OverDrive HI

Step 3: “Pick Your Parts” Prior to this you should know: – The other robot types that will exist – The rules……all of them – What is worth doing Prioritize – Scoring, defense, the middle-man, end game Remember: You are an alliance – You can rely on the other robots to do some things – You can’t guarantee an alliance

For What it is Worth…. Is a task worth the reward for accomplishing it? You want an easy task that scores big points How long will it take? Defense is just as rewarding – 10 points kept out are the same as 10 points scored How much weight is dedicated to a single task? Know the ranking system!

Time Analysis

Step Two: Know Your Limits Every Team has them! – Space – Build time – Machinery/ Tools – Knowledge – Cost Simple is Better

Step 4: “Make Tradeoffs” The robot has limits Your analysis should help you with this Speed vs. Power Complexity vs. Durability Pneumatics vs. Motors Motor Placement

Step 5: “The Details” Decide on a drive train Think of materials Begin to sketch and draw your design Get on the same page! – Brief the whole team

Drive Train Selection Choose a system that matches your strategy Think of your programmers, and drivers Mobility Weight Drivability Calculate expected speed

Drive Train Selection WeightTankMecanumHoloSlideSwerve Agility Pushing Motor need Programming Drivability Obstacles Design Work West Coast – Cantilever Butterfly 4 WD, 6 WD, Tank Many more…..

Design Tips Wheel size is important! Shift weight from center Tensioner! Short distance means high speed is less important Guidelines (Robo-Wranglers) – 3 ft/s: pushing – 4-7 ft/s: slow, pushing – 8-12 ft/s: quick with some push – 13+ ft/s: very fast, no push, hard to control

Design Tips Avoid shoulders, grooves or features on active shafts Set screws should NOT transfer load Chain vs. Belt Gears trade speed for torque – Only way to get both is more motors

Design Tips Tweak to improve, not to make work Don’t fix mechanical problems with software Plan where electronics will go Battery has a big impact on CG Limit switches damage easyily….be ready

Alicante, Spain

Wiggle Room Leave a little bit of it… If the maximum width is 26 inches, make the robot 24 inches – You may need extra space for new mechanisms – You must fit in the size-box at competition Leave spare weight – All scales are a bit different (look at tolerances) – You may need to add bolts or even whole pieces – No one likes a Swiss-cheese robot Order materials early

Drive, Drive, Drive! Experience is essential for drivers Drive a similar robot if available Practice turns, corners, & fine-maneuvering Teams that attend two regionals have an edge Practice driving with a coach

The Cool Factor Make your robot “POP” Decorations are important Clean construction Autonomous movement A bright color or stand out feature All of these will help you be scouted!

Inspect Your Robot Print the inspection sheet from the FIRST website and USE IT! From inspections last year: – Wire size (check the CIMs) – BUMPERS!!! – Be inside the bumper-zone – Bumper zone (height/ gaps) – Easy access to main breaker

Say Goodbye Almost time to relax but… Take Measurements – Helpful if you need to make changes – Be smart about your with- holding allowance Take a lot of reference photos Put the bumpers on the robot – Remember doorways! Be careful with your bag….it may tear! Take a break and relax once it is done

More Information Chief Delphi - white papers

Schedule (to lunch) Break-out #1: – Lab-View (basic)…… ALC – Pneumatics………….. AUD – Scouting……………….. LIB Break-out # 2: – Lab-View (advanced)……. ALC – Student Outreach………… LIB – Drive Train (basic)………… AUD