Blog · Siemens NX · 14 October 2026

Parametric bicycle in four sizes with Siemens NX and Teamcenter

A saved skill builds a bicycle in Siemens NX 2306, a journal makes it expression-driven, and four sizes (1,366 to 1,847 mm) go to Teamcenter with drawings.

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A saved skill built a bicycle in Siemens NX 2306 with Teamcenter, a journal made it fully expression-driven, and four sizes were generated and saved as Teamcenter items with a drawing each. Overall length runs from 1,366.13 mm for the kids size to 1,846.76 mm for the XL.

What was asked

One request starts NX in Teamcenter mode and builds the bicycle from the saved skill called Parametric bicycle. The skill holds the recipe and its inputs, all as NX expressions: wheel diameter 660, wheel base 1050 and frame size 450 mm.

What the agent did

NX part window mid-build with the frame tubes and a Model History list, chat on the right — The frame and lugs appear in the NX part navigator as the recipe runs.

SphereHarness launches NX in managed mode, creates the part and works through the recipe: frame, lugs, stays and fork, saddle and bar, and both wheels with hubs, spokes, rims and tyres. Each feature shows in the part navigator and every CAD call is listed in the chat. When a step does not come out as expected, the agent says so and fixes it. At the end it reads back the measured bounding box, 1720.56 by 441 by 920 mm, and the overall length matches its own expression.

Finished bicycle in NX with red frame, gold rims and black tyres — The finished bicycle with the colours set from the NX palette.

It then saved the bike as a new Teamcenter item in a folder that did not exist yet, creating the folder, placing the item at revision A and checking that the folder lists it. NX colours come from a palette, so the agent read the palette by index, found medium orange, medium steel and charcoal grey, and set tyres, grips and saddle black, hubs, spokes and bar grey, and rims orange.

Teamcenter rich client with a Quick Open results list of bicycle items — The same items found in the Teamcenter rich client.

In the Teamcenter rich client the agent signs in with the username typed and the password filled from the Windows credential manager. The video states that nobody sees it, not the viewer, not the chat and not the AI, which only names the saved entry.

Journals for what has no command

There was no ready-made operation for reference sets, and the datum triads cluttered the view. The agent wrote an NXOpen Python journal that creates a model reference set with exactly the 38 solid bodies and blanks every datum coordinate system. The first bike followed the recipe but not every placement was tied to the expressions, so a second journal built the whole bike from expressions.

Expression-driven bicycle in NX in an isometric view — The expression-driven version, saved as a new Teamcenter item.

What we measured

With the kids values 508, 850 and 300, the measured overall length became 1,366.13 mm, and back at the adult values it returned to 1,720.56 mm. A variation template then held the three driving expressions with four rows: kids, youth, adult and XL.

Chat table of four sizes with new item numbers and measured lengths of 1366.128, 1599.760, 1720.560 and 1846.760 mm — The size family: four Teamcenter items with measured lengths.

Each size became its own Teamcenter item: kids 1,366.13 mm, youth 1,599.76 mm, adult 1,720.56 mm and XL 1,846.76 mm, measured with GetBoundingBox on each saved item.

What did not work

The chat in this frame carries a caveat: the generate step reported verified:false for all four items, because NX does not report per-feature rebuild state. The lengths were verified from the measured bounding boxes instead.

NX drafting sheet with side, top and isometric views of a bicycle and a title block — One drawing per size, stored in Teamcenter.

Each size also got its own drawing with side, top and isometric views and dimensions for wheelbase, overall length, tyre diameter and width over the bars. The kids sheet shows 850 and 1,366.1; the XL sheet 1,100 and 1,846.8.

Try it yourself

The NX page is at /nx, and the first-run steps are in /help/getting-started.