A sample mechanical designer’s checklist that saves time, stress, and rework

How many times has a design been “almost ready,” only to be sent back from production, assembly, or testing with a list of issues: collisions, lack of tool clearance, poor material selection, unforeseen loads, or documentation that doesn’t match reality? That’s exactly why this checklist was created—so that designers can catch errors before they turn into costly revisions, delays, and unnecessary stress.

In practice, this checklist helps organize the entire design process: from the analysis of forces and physics, through the selection of materials and technologies, all the way to assembly, service, and documentation. This is not a “tick-box list,” but a tool for designing machines that can actually be built, assembled, and used without surprises.

Designer’s Checklist

1. Estimate forces and moments, or take measurements and perform calculations.
2. Define the project’s physical parameters: temperature, pressure, vacuum, vibrations, flow rates, radiation, and convection.
3. Check if you can reuse parts from other projects.
4. Design the part for function, assembly, and manufacturing technology.
5. Check for symmetry if it makes structural sense.
6. Select fits and surface roughness based on the part’s function.
7. Evaluate the part’s manufacturability.
8. Verify strength.
9. Check the part’s weight, and if relevant, plan for transportation and lifting.
10. Select materials based on strength, corrosion resistance, thermal compatibility, and cost.
11. Assemble the parts into a complete assembly.
12. Perform FEM/FEA/CFD/FDEM simulations for key loads.
13. Remove unnecessary parts.
14. Combine small components into larger, more meaningful assemblies.
15. Apply constraints consistent with the actual motion and degrees of freedom of the parts.
16. Check for part interference, positioning errors, and collisions.
17. Analyze holes: distance from edges, welds, washers, nuts, and access for tightening.
18. Set the extreme positions of the components and check for collisions.
19. Verify the assembly’s motion.
20. Check the assembly’s cross-sections in various planes.
21. Analyze the assembly feasibility of the entire assembly.
22. Create 2D documentation.
23. Plan prototype testing: durability, assembly, and functionality.
24. Optimize the design for standard and purchased parts.
25. Analyze chamfers and fillets at contact and assembly points.
26. Evaluate the ergonomics of use.
27. Verify dimensions and weight for transport, service, and use.
28. Check the documentation for missing dimensions.
29. Mark the location of the nameplate and pictograms.
30. Compile a parts list.
31. Conduct an external review, preferably with another designer or team.
32. Assess service access and maintenance.
33. Prepare a BOM for spare parts and wear-and-tear parts.
34. Verify compliance with standards (ISO, PN) and safety requirements.
35. Assess risks and safety issues.

Why It Works?

The greatest value of this checklist becomes apparent at the stage where the most costly errors typically occur: during requirements definition, assembly, and documentation. If the designer checks these points before releasing the model, they reduce the risk of collisions, manufacturing issues, illegible drawings, and post-prototype revisions. This is particularly important in machine design, where an “error on the screen” often translates to real-world costs on the shop floor.

Additionally, this checklist organizes the design process and helps transition from a “pretty 3D model” to a design that makes sense from a technical, cost, and service perspective. That’s why it works well not only for experienced designers but also for those who want to reach a higher level of design more quickly.

Who is this checklist for?

This checklist is for machine designers, mechanical designers, design engineers, R&D personnel, and anyone who wants to reduce chaos in the design process. It is useful for new machines as well as for retrofits, prototypes, and projects that need to move from CAD to production without wasting time. It’s also a good reference point for teams looking to standardize workflows between design, manufacturing, and assembly.

If you want to work with a ready-made framework instead of improvising, use the app on MechSkills and manage your project according to a proven process. It’s a simple way to detect errors faster, document decisions better, and design with greater confidence from the very first sketch.

Login for free and use Mechanical Design Checklist Pro: 35-Step Guide for Machine Engineers

Design Booster — practical toolkit for mechanical engineers

To wrap things up, Design Booster isn’t just a concept — it’s a set of practical tools you can apply immediately in your daily engineering work:

• CNC Price Estimation Tool – Instantly estimate manufacturing costs directly from STP files for turning, milling, and laser cutting — no more guesswork in quoting.
• Business Context & Problem Card – Clearly define the real problem before designing, ensuring your solution actually delivers business value.
• Mechanical Project Questionnaire – Start every project with the right inputs, reducing costly misunderstandings and redesign loops.
• Mechanical Design Checklist Pro – A structured 35-step checklist that helps you catch critical design issues before they become expensive problems.
• Mechanical Strength Calculators (Free) – Quickly validate key strength parameters (tension, compression, shear, buckling, fatigue) without building complex spreadsheets.
• Free Autodesk Inventor Macros – Automate repetitive CAD tasks and save hours of manual work directly inside Inventor.