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Motion control sizing calculators

Use transparent, browser-based calculations to prepare an enquiry. Every tool includes its method, units, an illustrative worked example and the checks it leaves unresolved.

Servo RMS torque calculator

Calculate time-weighted RMS torque, peak magnitude and cycle time from torque-and-time segments. Carry the figures into a motor sizing enquiry.

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Gearbox ratio, torque and inertia calculator

Estimate output torque and speed through reduction gearing, plus load inertia reflected to the motor. Check assumptions before choosing a gearbox.

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Linear actuator force and screw torque calculator

Estimate one upward-motion load case, screw torque, screw speed and mechanical output power. Prepare the figures for an actuator selection enquiry.

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Use the tools in the selection sequence

Start with the mechanism and the movement required. Identify the operating points, force or torque and time spent at each condition. Use the tools to understand individual relationships before selecting a product from the catalogue. A result with the right units is not automatically a complete design.

For a repeating servo duty, combine the known motor-shaft torques using the RMS tool. For a reduction gearbox, explore speed, estimated torque and reflected load inertia. For a screw-driven actuator, estimate one upward motoring load case and the screw torque and speed associated with it.

Keep the assumptions with the result

Replacing an example value with a guessed efficiency or load does not make the calculation verified. Include the source of your inputs and identify uncertain figures when sending an enquiry. Manufacturer curves, mechanical ratings, installed cooling, life and the complete machine requirements still need checking.

Tools do not require an account and make no AI calls. Calculation inputs remain in the browser until you choose to add them to an enquiry and submit your contact details. The examples are hypothetical, not customer projects or engineer endorsements.

Request sizing support · Find checklists and manufacturer resources

UK engineering team · Product sourcing · Supply support

Get the products, pricing and sourcing support you need

Send your part number or describe what the machine needs to do. We connect your requirement with experienced UK engineering and procurement support to help you get the right products, pricing and supply options. Your matched provider can take the enquiry through quotation and ordering to delivery and after-sales support.

  • Source original parts or assess suitable alternatives
  • Get pricing, lead times and a defined supply proposal
  • One enquiry for components, complete axes and ongoing support

No obligation to buy. Choose the quick form below or use the full configurator on this page. Add what you know; an engineer can help with the details.

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Spec builder

Build your specification

Select the products and performance you need. Our UK engineering team can use your specification to help source the right components, pricing and supply options. See your summary before adding contact details.

Already know the part number? Use the quick enquiry form. You can configure a requirement below without registering.

  1. 1Products
  2. 2Performance
  3. 3Environment
  4. 4Volumes
  5. 5Your spec
Step 1 of 5

What are you specifying?

Select everything you need. A motor, drive and gearbox can be specified together as one axis.

Select one or more products

UK engineering input · A route to buying the right products

From your enquiry to products, delivery and support

Specify Motion helps turn a part number or application into a purchasing enquiry. We provide recommendations and connect your requirement with a relevant engineering or procurement provider for product selection, pricing, sourcing and supply.

  1. Tell us what you needSend a code or configure the application, quantities and timing.
  2. Reach a relevant providerAccess experienced UK engineering input and a suitable procurement route.
  3. Review the quotationYour provider confirms the products, price, compatibility checks and supply terms.
  4. Order with delivery and support agreedConfirm delivery, warranty and after-sales arrangements with the contracting provider.
Get pricing and sourcing support →Use the full configurator

You choose whether to proceed with the provider and should carry out your own checks. Website and introduction service terms.