Engineering Tools

Work the numbers before you send the drawing.

These are the checks an engineer does when a drawing lands. Running them first is the difference between a quote and a question, and between comparing two offers on unit price and comparing them on what actually lands.

Every tool is rule-based: it works from the numbers you enter and the capability data on this site. None of them pretend to be CAD analysis, none of them quote a price, and each one says so on the page.

Enquiry

Engineering

DFM Precheck

Run a rule-based manufacturability check on a feature list and see which of eleven common problems your design is exposed to, with the standard fix for each.

Outputs

  • Per-rule risk assessment
  • The fix a machinist would apply
  • What to change before quoting

Unit & Metric/Imperial Converter

Convert length, cutting speed, feed, mass, force, pressure, temperature and roughness units between metric and imperial, on exact definitions rather than rounded tables.

Outputs

  • The converted value
  • The same value in every unit of the group
  • What not to convert

Tolerance Calculator & Converter

Read a tolerance written as a ±, a limit pair or a unilateral allowance, turn it into a band in mm, µm, inches and thou, and see when it crosses into grinding.

Outputs

  • Min/max material condition
  • Band in mm, µm, inch and thou
  • The equivalent ±
  • A cross-check against the published machining limit

Surface Finish Converter & Selector

Convert a surface roughness between µm and µin, see which operations actually reach it, and get a target when you are starting from what the surface has to do.

Outputs

  • The value in both units
  • Operations whose typical band reaches it
  • A target for the requirement
  • Where the value crosses into polishing or lapping

Thread & Fastener Calculator

Turn a thread designation into its pitch, tap drill and clearance hole, and find the nearest equivalent in the other thread system.

Outputs

  • Pitch and threads per inch
  • Tap drill in both systems
  • Clearance hole
  • Nearest metric and inch equivalents

Hole & Shaft Fit Calculator

Enter the four limits from the drawing and find out whether the parts assemble by hand, need a press, or lock - and which side of the tolerance to tighten.

Outputs

  • Clearance or interference at both extremes
  • Clearance, transition or interference fit
  • Which side carries the tolerance
  • What the assembly will need

Machining Time Estimator

Turn feed, speed and setup into a cycle time and a batch time, and show how much of the batch is the setup rather than the cutting.

Outputs

  • Feed rate
  • Cycle time per part
  • Batch time including setup
  • The setup share of the batch

CNC Process Selector

Describe the part - shape, size, quantity, tolerance, material and features - and see which process would make it, with the rule that decided it and the operations it will also need.

Outputs

  • The primary process, with the reason
  • The operations the part also needs
  • Where the part is likely to cost more than it looks

GD&T Reference

Look up what each geometric control actually controls, whether it needs a datum, and what it does not say - which is where drawings usually go wrong.

Outputs

  • What the control controls
  • Whether a datum is required
  • The misunderstanding that costs money
  • What the modifiers change

CNC Design Rule Checker

The rules a cutter actually obeys - corners, pockets, threads, datums, burrs - each with why it exists and what to do instead, plus what we publish about our own capabilities.

Outputs

  • The design rules, with the reason for each
  • What to change instead
  • Our published capabilities, each classified
  • The modifiers that matter

Materials

Commercial

Total Landed Cost

Turn a unit price into the number that actually lands: tooling, inspection, packaging, freight, insurance and duty, plus the per-unit share of each.

Outputs

  • Line-by-line landed cost
  • Per-unit landed cost
  • The share of the total that is not the part price

Lead Time Estimator

Read the lead time we publish for a product family or a material grade, add your own finishing, inspection and transit, and see the total in working days.

Outputs

  • The published range, and where it comes from
  • The range in working days
  • Your adders and the total
  • The published MOQ for the family

CNC Cost Driver Calculator

Rank what is actually driving the cost of a part - material, tolerance, batch size, features, finishing, inspection - and see which one to change.

Outputs

  • The drivers, ordered by influence
  • Why each one costs what it costs
  • What to change to move it
  • Where the price is concentrated

BOM Cost Estimator

Roll several parts - each with its own price, quantity and one-off tooling - into one total, and see which line owns the money.

Outputs

  • Line cost, line share and tooling share
  • Parts and tooling subtotals
  • Grand total with freight and duty
  • Where the spend is concentrated

Incoterms Cost Calculator

Compare two Incoterms 2020 rules segment by segment - who pays export clearance, freight, insurance, duty - and see where risk turns over against the cost.

Outputs

  • Which party pays each of seven cost segments
  • Where the two rules differ
  • Where risk passes, and where cost does
  • What each rule is commonly misused for

MOQ & Quantity Economics

See the published MOQ for a family against the quantity you want, and what the extra parts in a price break actually cost - which is not the same as the unit price.

Outputs

  • Whether you clear the published MOQ
  • The unit price fall
  • The cost of the NEXT part
  • Whether the break is real or arithmetic

This is the first set. The Tool Center is being extended with tolerance and unit converters, thread and fit calculators, a machining time estimator, a surface-roughness converter and an Incoterms calculator, each one built and published the same way: rules stated, limits stated, no invented numbers. Tools that are not listed here do not exist yet.