Question for CNC Reading
1.) Explain what is CNC? _
2.) What kind of code does it read? _
3.) A milling machine is most closely to which type of drafting.
additive / subtractive
4.) CNC was preceded by NC code. Explain the difference.
The Design Process(Security Doorstop)
Problem I.D. - In these times of heightened security, we have been asked to develop a simple
door stop that can be easily actuated to facilitate the door being locked and remain open wh
Interchangeability of manufactured parts is a critical element of present day production. The
production of closely mating parts is possible but as the fit becomes closer it may also become
economically unfeasible to produce. For this reason,
Types of Fits
Preferred Precision Fits The American National Standards Institute publishes the Preferred
Limits and Fits for Cylindrical Parts (ANSI B4.1-1967) to define terms and recommending
standard allowances, tolerances, and fits for mating parts. Th
Table for Running and Sliding Fits
VALUES SHOWN BELOW ARE IN THOUSANDTHS OF AN INCHES
Clearance Standard Clearance Standard
A mold or mould is a hollowed-out block that is filled with a liquid like plastic, glass, metal, or
ceramic raw materials. The liquid hardens or sets inside the mold, adopting its shape. A mold is
the counterpart to a cast. The manufactu
Categories of Materials
Metals and Alloys
Polymers or Plastics
Organics are or were living organisms
Composed of mostly carbon and
Structure depends on the way cells
develop, not by human manipulation
A manufacturing process where a solid is melted, heated to proper temperature, and is
then poured into a cavity or mold, which contains it in the proper shape during solidification.
Simple or complex shapes can be made from any metal that
Material and Process Justification
Mechanical Engineering Avon High School
Write a paragraph justifying the material and process that you would use for the doorstop project.
Use the guiding questions below.
Based on what you have learned from the material