Map the behavior
Define states, sequence, load cases, constraints, interfaces, and unacceptable failure modes.
Motion, force, and control
Mechanism and Machine Design That Behaves Predictably
I design and refine mechanisms by resolving motion, force, constraint, wear, packaging, safety, and manufacturing as one connected problem.
Signals this work is needed
- Required motion is understood, but the architecture or constraint strategy is unresolved.
- Input force or torque is excessive, inconsistent, or sensitive to variation.
- A mechanism jams, back-drives, rattles, wears, loses position, or fails intermittently.
- Packaging conflicts or moving envelopes are forcing unnecessary complexity.
- A prototype depends on fragile adjustments or cannot tolerate production variation.
What I evaluate
- Degrees of freedom, motion sequence, end states, travel, speed, and interference envelopes
- Force, torque, energy, mechanical advantage, inertia, impact, and return behavior
- Compliance, backlash, clearances, tolerance stacks, and alignment sensitivity
- Shafts, bearings, gears, screws, springs, detents, stops, and counterbalances
- Contact stress, fatigue, wear, friction, lubrication, contamination, and life
- Failure states, stored energy, overload paths, guarding, and service access
Approach
A practical path from uncertainty to a buildable result.
Solve the governing mechanics
Use kinematics, free-body diagrams, force and torque calculations, energy methods, and bounding cases.
Compare architectures
Evaluate simplicity, efficiency, packaging, tolerance sensitivity, safety, cost, and serviceability.
Develop and verify
Size components, control fits and envelopes, create production-intent CAD, and test friction, wear, load, effort, repeatability, and life where needed.
Typical deliverables
- Motion-state diagrams and kinematic layouts
- Force, torque, stress, wear, and life calculations
- Architecture alternatives and trade studies
- Mechanism CAD and purchased-component selection
- Fits, clearances, and tolerance analyses
- Drawings, prototype fixtures, test plans, and supplier packages
Engineering considerations
- Behavior must remain predictable across friction, tolerance, wear, temperature, and user variation.
- Hard stops, overload paths, stored energy, back-driving, and jam states require explicit treatment.
- Low effort cannot compromise holding security or stability.
- Assembly and service must preserve alignment and preload without undocumented craftsmanship.
- Validation should reproduce governing loads, states, duty, abuse, and end-of-life conditions.
A productive fit
- Motion, force, packaging, reliability, or manufacturability controls product success.
- An existing mechanism needs objective diagnosis before parts are changed.
- The buyer is open to architecture changes when calculations reject the current direction.
Usually not a fit
- The request is limited to animation, appearance, or undocumented CAD cleanup.
- A predetermined concept must be preserved despite unresolved feasibility or safety problems.
- No operating states, loads, interfaces, or failure observations can be established.
Questions
Practical details before the first review.
Can an existing mechanism be improved without replacing it?
Often. I isolate the controlling failure or sensitivity, then compare a focused correction with broader architecture changes.
How do you choose purchased versus custom components?
I compare function, ratings, variation, availability, integration, service, supplier risk, and total installed cost.
Can analysis replace a physical prototype?
Not when friction, wear, impact, user feel, or uncertain boundary conditions control behavior. Analysis should make the prototype smaller and more informative.
Direct senior involvement
Turn the product decision into a clear next step.
Share a non-confidential summary, the current stage, and the outcome the team needs.
Discuss Your Project