A joint is a junction where structural elements meet without applying a static load from one element to another. When one or more of these vertical or horizontal elements that meet are required by the design to have be fixed

Permanent fixed joint – joints that can not easily come apart. Permanent fixed joints should be used when the detail parts or assemblies being joined have low or no repairability requirements.

  • Welding
    • Useful method of joining materials
    • Strong joint if welded properly
    • Joint is susceptible to fatigue failure, so make sure the material is think enough to withstand the number of cycles you are expecting
      • A cycle could be something like there will be 40 joint flexures per match, the team expect 100 matches so make sure the joint could withstand 40 x 100 x 2.5 = 1,000 or 10^3 joint flexures for the season
      • Weld fatigue life calculator
    • Only weld in properly set up designated areas with a trained professional while wearing the correct safety gear
  • Adhesive
  • Rivets
  • Mortis & Tenon
    • Use only if fabricating robot parts with wood

 

Temporary fixed joint – joints that can easily come apart. Temporary fixed joints should be used when the detail parts or assemblies being joined have high or mandatory repairability requirements.

  • Bolts & Nuts

    • FRC team should standardizing parts to reduce the number of tools needed, to reduce confusion, speed up repair times and reduce weight.  Here are the bolts we recommend;
      • 8-32
        • Use socket head for FRC application
        • Come with protruding and flush head configuration
      • 10-32
        • Use socket head for FRC application
        • Come with protruding and flush head configuration
      • 1/4-20
        • Heavy weight steel fastener that is very strong
        • Use only when absolutely necessary
        • Use socket head for FRC application
        • Come with protruding and flush head configuration
    • Bolt size selection guide
    • Nuts
  • Screws
  • Pins

 

Additional Resources