effective prototyping - first · effective prototyping paul ventimiglia – frc254 / aptyx designs...
TRANSCRIPT
Effective Prototyping
Paul Ventimiglia – FRC254 / Aptyx DesignsDan Richardson – Ri3D
Andrew Rudolph – FRC233 / Ri3D
The Experts• Paul Ventimiglia
– 254– Former 190– 2006
• Dan Richardson– Ri3D– Former 1902– 2002
• Andrew Rudolph– Team 233 & Ri3D– Former 1902– 1999
Why Prototype?• You can’t think of everything• Real world physics• Start the iteration process early• Save resources
Why Prototype?• Geometry Details
– Find “gap” or “compression” for rollers/shooters
– Shape of “claws”• Friction/Physics
– Surgical tubing, conveyor material, urethane wheels, COTS wheels
• Performance• Programming Testbed
Why Prototype?• Performance
– Reliability testing, “shot percentage”– Speed of intaking– Ease of use
• Programming Testbed– Seeing if it can be adjusted– Playing with sensors early– Strategy and design changes?
Good Prototypes…• … are made fast.• … meet basic specs needed.• … don’t have to work the first time.• … don’t have to be pretty.• … we learn from.
How I Prototype (Paul)• ½” Plywood & 2x4s
– Can be cut with Jigssaw, chop saw, band saw.
– Drilled by hand, or drill press– Wood Screws (Impact gun!)
How I Prototype (Paul)• Sprockets & Chains
– Allows for quickly changing ratios– Driving motors located out of the way– Easily slide motors to tension
• #25, 10T, 16T, 18T, 22T
How I Prototype (Paul)• Hole saws
– 1 1/8” popular size for Thunderhex and standard ½” ball bearings
• C-Clamps, Bar Clamps– Allow for readjustment
How I Prototype (Dan)• CAD
– Motion / Structural studies– 3D printing– Faster polished designs
• CAD can “lie”– You still have to do the math– Physical prototypes
• Printing CAD sketches for mockups• Use what you have available
How I Prototype (Andrew)• Start simple
– Paper, cardboard, Lego– Thumbnails
• Use what you have– Wood– Foam Core– Hot Glue– Plastic
Robot in 3 Days• Goals
– build an 80% performing robot– use commonly available materials/tools
• Some prototypes made it onto the final bot
2014 254 Prototypes• Shooting tests
– 2 Launchers, 1 Flywheel
Skystalker• Built within Week 1• Shooter tested extensively
– Fixed position, repeated shots– Location and angles tested
• Tested as a complete unit only for a few days
Skystalker• 3 separate prototypes
– Shooter, intake, “popper”• Direct geometry copied for final robot
design– Moment of inertia for flywheel, wheel testing
• Strategy testing