Activity7.4Assembly Models

Procedure

Part I.Use the CAD modeling software to create an assembly of the Jack Lift. You will need access to the five parts of the machine: Base, Wedge, and Wedge Screw.

  1. Create a new assembly file titled Jack Lift and save it to your student folder.
  1. Place the Base component into the assembly. This component will be grounded and, therefore, locked in space. Next, place the Wedge and Wedge Screw components into the assembly.

  1. Apply a tangent constraint to the neck of the Wedge Screw component (selection shown in blue) and one of the vertical walls of the open slot on the Base component (shown in green).

  1. Apply a mate constraint to the back face of the Base component (selection shown in blue) and the circular face on the underside of the Wedge Screw’shead.

  1. Apply a mate constraint to the bottom face of the Wedge component (selection shown in blue) and the top angled face on the Base component (selection shown in green).

  1. Apply a mate constraint between the center axis of the threaded hole in the Wedge component (selection shown in blue) and the center axis of the Wedge Screw component (selection shown in green).

  1. Apply a flush constraint to the front faces of the Wedge component (selection shown in blue) and the front face of the Base component (selection shown in green).

  1. Perform an interference analysis between the Wedge and Wedge Screw components.
  1. Revert to wireframe screen mode and perform a screen grab of the image. Print the image out and affix it to a page in your engineering notebook. Make an entry in your notebook that speculates as to the reason why interference exists between these two components.
  1. Save the Jack Lift assembly file.

Part II. Use the CAD modeling software to create an assembly of the Automoblox T9 vehicle (or another Automoblox mode). Use subassemblies as detailed below for parts that are to be permanently connected. Use the image of the assembled vehicle and the exploded assembly view below to help you assemble the vehicle correctly. Save your assembly files (for the complete vehicle and for the subassemblies).

The following should be assembled separately and used as subassemblies in the final assembly drawing.

  • Subassembly 1: T9 Bed, (2) T9 Axles, and T9 One Block Socket
  • Subassembly 2: T9 Front, (2) T9 Axles, and T9 Two Block Socket
  • Subassembly 3: T9 Passenger Section, T9 Two Block Socket, T9 One Block Socket, and T9 Passenger Base

Exploded Assembly of T9 Automoblox

Perform a screen grab of each assembled sub assembly and the complete assembly. Print each image and affix it to a page in your engineering notebook. Label each subassembly and the assembly

Assembly of T9 Automoblox

Conclusion

  1. What is an offset and how is it used?
  1. What is the difference between a mate and flush constraint?
  1. What constraint would you use to place a pin inside a hole? Which degrees of freedom does this constraint remove? Use a sketch to define the degrees of freedom.
  1. Describe a situation in which you would use a tangent constraint. Which degrees of freedom does a tangent constraint remove? Use a sketch to define the degrees of freedom.
  1. What is a subassembly? How is it useful in the assembly of a complex product that involves multiple parts?

Project Lead The Way, Inc. ● Copyright 2012 ● IED – Activity 7.4 Assembly Models– Page 1