FIRST Mechanical Design

cypriotcamelUrban and Civil

Nov 29, 2013 (3 years and 10 months ago)

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FIRST Mechanical Design

Presented by:


Andy Baker

BSME
-

University of Evansville

Mark Koors

BSME/EE


GMI (Kettering)

Mechanical Engineering &
Mechanical Engineering Technology


Product designers


Everything


Manufacturing engineers


Any type of manufacturing… equipment and
process support and design


Plant engineering


Schools, power plants, factories

… a good foundation for other types of
engineering

TechnoKats mechanical design


Design history


TechnoKats designs


Great FIRST team designs


Design process


Prototyping


CAD design


Sketching / drawing


Component sizing and specification


Detailing


Pick
-
up

ME example


2 FIRST robots each weigh 130 lbs. (Wr)


A 2002 goal weighs 180 lbs. (Wg)


Both robots have same treads, with
friction coeff. = 1.2 (u)


Both robots have same motors pulling
the robot


1 robot can lift one side of a goal by 4
inches.



Which robot wins a tug
-
of
-
war
and by how much?

R1

Goal

R2

Force R1 = (Wg (.3) + Wr) x u


= 220 lbs.

Force R2 = Wr x u


= 156 lbs.

Force R1 = Force R2 + difference

Difference = 64 lbs., Robot 1 wins!

Materials


Metal


Steel, stainless steel


Aluminum


Titanium


Bronze


Plastic


Polycarbonate (Lexan)


Acrylic (Plexiglas)


Acetal (Delrin, Nylon)


Flouropolymer (Teflon)


Rubber


Neoprene


Urethane


Latex


Cable


Nylon


Polyester (Spectre)


Steel

Cable

Plastic coated
steel cable

Polyethylene
cable

Fasteners

Screws

1.
Socket head screw

2.
Button head screw

3.
Flat head screw

4.
Lag bolt

5.
Shoulder screw

6.
Thumb screw

7.
Wood screw

7

6

5

4

2

3

1

Fasteners

Nuts

1.
Wing nut

2.
Nylon nut

3.
Nylock not

4.
Regular ol’ nut

5.
PEM nut

6.
T
-
slot nut

7.
Drop
-
in t
-
slot nut


1

2

3

4

5

6

7

Fasteners


Velcro


Rivets


Cable ties

Fasteners

Washers

1.
Flat

2.
Fiber

3.
Hard

4.
Lock

5.
Nylon

Spacers

1

2

3

4

5

Fasteners

Welding

1.
Aluminum

2.
Steel

Adhesives


2 part epoxy


Super glue


PVC cement

(not shown)

1

2

Fabrication

Band saw


Wood/plastic


Metal

Fabrication


Sander


Grinder

Fabrication


Drill Press


Mill

Fabrication


Lathe


Arbor Press

Fabrication


Break


Shear

Tools


Pliars & Wrenches


Allen wrenches


Socket wrenches

Tools


Cutting tools


Screwdrivers

Tools


Files


Taps & die


Mill bit, drill bit, hole saw,
reamer, step drill bit

Tools


Hammer, rivet gun,
hack saw


Lubricant, cutting
fluids, PVC cement

Tools


Measuring tools


Power tools

Mechanical parts


Bearings


Collars & couplings

Mechanical Parts


Springs

Extension

Torsion

Compression

Constant
Force

Mechanical Parts


Gears


Pulleys

Mechanical Parts


Sprockets & chain


Timing belt w/ pulley

25 series

35 series

Master
link

Mechanical Parts


Latches


Motors

Seat

Globe

Drill

Fisher
Price

Johnson