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For the Classroom - Machine Screws

Objectives:
Familiarize students with the various types of machine screws, along with some of the things to consider
when selecting screws for specific applications.

Discussion Topics:

miniature screws chartMachine Screw Slide Charts

Screws:

  • Metric vs. Imperial (Inch)
  • Fine threads vs. coarse threads
  • Miniature Screws
  • Drill and tap information
  • Different bolt grades, materials (Steel, Stainless Steel, Aluminum, Brass, Plastic, etc.), and finishes (Black Oxide, Galvanized, Zinc Plated, Nickel, etc.)
  • Purpose of lock nut, lock washer, Loctite
  • Advantages and disadvantages of one type of screw over the other (Allen vs. Phillips vs. Slotted vs. Tamper Proof) or (Button Head vs. Socket Head vs. Flat Head)

 

Drilled Hole Tolerances ChartClearance Holes Screw Chart

Holes:

  • Blind holes, clearance holes, and tapped holes
  • Thru. vs. C’bore vs. C’sunk
  • Drilled Hole Tolerances

 

 

Tools for installing and removing screws and the advantages and disadvantages to each:

Screw Chart Wrench Clearance Sizes

    Hand tools

    • Wrench Clearances
    • Wrenches (open and box) vs. Sockets
      (6 - 8 - 12 point, shallow & deep, universal, 1/4 - 3/8 - 1/2 - 3/4 drive)
    • Allen keys
    • Ratcheting screw drivers and wrenches
    • Torque wrenches
    • T-Handle

    Power tools

    • Electric drill, pneumatic ratchet, and impact

Advanced Topics:

  • Tensile & Shear – Stress area and general equations
  • Stripped screw heads — How to remove a screw with a stripped head
  • Broken Taps—How to remove a broken tap from a hole

Classroom Practice (with other supporting materials):

  • Drill and tap a hole in a piece of aluminum or steel
  • Show examples and/or pictures of how different screws are used
  • Hands on - Show examples of various screws made out of different materials, with different finishes and sizes
  • Hands on – Use some of the various tools for tightening and loosening screws, paying attention to wrench clearances, lock washers and lock nuts, ergonomics issues
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