Associate | ~3 hr.

Model engine project 5: Crank


Model, program, and machine a crank as a part of the model engine assembly.


Using the model and engineering drawings provided, set up and program toolpaths for the crank.

Project scenario:
A customer has asked your company to redesign a model engine assembly and to machine a prototype. They have provided engineering drawings of the original crank. This project requires you to model and redesign the crank while maintaining the standard features, bolt location, and internal engine clearances.

Begin with the supplied engineering drawing if you're going to model the original part or use the provided resources to model a custom design. Use the engineering drawing as a reference for the crank shaft diameter, bolt location, and overall dimensions of the part. Consider various stock sizes and shapes to incorporate your unique design.

The company also provided engineering drawings of the original part as well as a CAD model of the crank. They would like to prototype all components of the engine assembly. This project requires you to set-up and program toolpaths for the crank provided. Begin with the supplied engineering drawing and the CAD model. Use the engineering drawing as a reference to plan tools required and work out any work holding requirements. 

The crank requires the use of a soft jaw, which is supplied. For more details on designing soft jaws, please refer to Model engine project 4: Crank soft jaw. Consider various stock sizes and shapes and think about the number of operations required to machine the part. 
Sample process plans, setup sheets, cutting data, and inspection reports are provided but use your judgment, the tools, and machines you have available, and your knowledge to complete the project.

Instructor resources

Teaching this project to students in the classroom? 
Use this instructor guide to incorporate this and our other model engine projects into your lesson plans. You'll understand how to use CAD and CAM workflows to combine this and other projects into a model engine assembly. Then, machine the model engine using standard stock sizes.  

Want to create custom learning playlists to share with your students?
Share modules and courses using Playlists. Once you create a Playlist, share the URL with your students and they can sign into their Autodesk Account to access. Choose and share the modules that best fit your curriculum using the links below.

  • To create a Playlist, select [+] 'Add to list' from the banner above.
  • To share a list with others, set the list visibility to Public and share the link.

Need to teach the skills covered this project? 
Send your students to our Introduction to CAD, CAM, and Practical CNC Machining for Milling self-guided course. They can learn at their own pace, track their own progress, and earn a certificate of completion when they get 75% or more on the final test.

Download resources

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