Problem formulation and analysis
Manufacturers' torque curves and specification sheets
Power loss in battery, wires and other components
Review of motors from a previous Kit of Parts
Deflection of beams
Deflection of beams
When a beam with a straight longitudinal axis is loaded by lateral
forces, the axis is deformed into a curve, called the deflection curve of
the curvature of a bent beam can determine the normal strains an
Fasteners are used in manufactured
products for several basic purposes:
They simplify manufacture.
They simplify repairs.
They provide safety.
When selecting a fastener for a
particular use, consider these factors:
Strength: Will it hold the
HW 4 available, due 2-7
Fundamentals Exam will be in class on 2-21
Nature of fatigue failure
Starts with a crack
Usually at a stress concentration
Crack propagates until the material fractures
Springs used as mechanical elements:
The Three Main Types of Springs: Helical Compression, Extension and Torsion
Produce a pull, a push, or a twist (torque) force when displaced.
Store or absorb energ
Rolling Contact Bearings load is transferred through
rolling elements such as balls, straight and tapered cylinders
and spherical rollers.
Journal (sleeve) Bearings load is transferred through
a thin film of lubricant (oil).
Rolling Contact Bea
Design and Development :
How does your machine work
Write some instructions for its safe use
How is it different from your initial concept
What are the most likely ways it could fail
What are the most likely ways it could hurt
What can be
What do you already know from previously
about the process of design and the steps
What is machine design?
Application of science and technology to
devise new or improved products
Product is any manufactured item including
BLOCK AND TACKLE
Compound Drive Pulley Trains
Pulley are wheels and
axles with a groove
around the outside
A pulley needs a rope,
chain or belt around the
groove to make it do work
Lifting Pulleys in transmission