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Engineering calculations / The reasoning behind the design

Show the work.
Shape the design.

Give the next design decision a method people can follow. Bring assumptions, equations and units together, then carry selected values into the model with the reasoning intact.

Explore the calculation workflow
Stepped drive shaft and bolted coupling, connecting cyan engineering construction lines to shaded machined metal
METHOD · DESIGNReasoned design.
The role of engineering calculations

Engineering questions.
Answerable methods.

Use mathematical relationships to investigate a design before—and alongside—detailed modeling. Size a component, examine an operating condition or compare alternatives with a documented basis for the decision.

ReachLoad
An adjustable arm. A question of reach and load.
Calculation to design

From torque to a diameter.
Keep the relationship in view.

Follow a solid shaft’s torsional sizing method. Choose a perspective to see the conditions, the equation and the selected parameter that a CAD model can use.

Explore the sizing workflow
SOLID SHAFT / TORSIONAL SIZING
Applied torque
T
Material shear limit
τlim
Design factor
n
Selected design parametershaft_diameter

Start with a defined load case.

Identify the applied torque, material shear limit and design factor. This torsion-only method assumes a solid circular shaft; other loads and geometry need their own checks.

Keep units with the equation.

Relate torque and allowable shear stress to a minimum diameter. Choose consistent units, document the factor and check how the assumptions affect the sizing decision.

Pass a selected value deliberately.

Map the worksheet output to a named Creo parameter. Update the intended inputs, push the selected output and review model regeneration and the surrounding interfaces.

Explore the connected CAD workflow
Choose where the calculation belongs

Two workspaces.
Different places for the math.

Compare engineering calculation workspaces
WorkspaceWorking contextNext step

PTC Mathcad Prime

Standalone calculations

Write, solve and explain engineering math in reusable worksheets. Mathcad Prime brings natural notation, units, numerical and symbolic calculations, plots and documentation into a dedicated workspace.

Explore Mathcad Prime

Creo Engineering Notebook

Calculations inside Creo

Keep a Mathcad-powered worksheet with a Creo model. Map designated input and output regions to model parameters when a calculation should inform geometry.

Explore Creo
What should we check before connecting the notebook?

Confirm the Creo release, package and supported workflow. In Creo 12.4 and later, Engineering Notebook requires the included feature in Design Advanced (T2) through Design Engineering Professional (T5); a standalone Mathcad license does not enable that notebook. Embedded worksheets are accessed through Creo.

Discuss your software environment
Your TriStar discussion brief

A focused first discussion.
Built around your work.

Bring a representative calculation and the software environment it needs. We’ll use them to scope a useful evaluation.

What to bring

  • One calculation

    An existing worksheet or spreadsheet, the question it answers and the method behind it.

  • Relevant design context

    The model, parameters, Creo release and supporting data the work depends on.

  • Review and reuse

    Who checks the work, how it is reused and what stays with the selected design.

Talk with a TriStar specialist
Your next engineering decision

Make the reasoning
part of the design.

Let’s discuss the calculation work your team needs to carry forward.

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What would you
like to connect?

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