A spur gear with a DIN 6885 keyway, in about half a minute

Modelling a gear by hand means drawing an involute tooth, patterning it, and then looking up the keyway for the shaft. We gave Genie one sentence:

A spur gear, module 2 with 30 teeth, 12 mm face width, a Ø12 bore with a DIN 6885 keyway, and a Ø32 hub 10 mm long on one side.

What came out

• The gear: module 2, 30 teeth, so a 60 mm pitch diameter and about 64 mm outside, 12 mm wide, with a Ø32 hub 10 mm long. 22 mm tall overall.
• The keyway, from the standard: Genie used the DIN 6885 row for 12 mm shafts (a 4 × 4 key, hub depth 1.8 mm), so the slot is 4 mm wide with its floor 7.8 mm from the axis.
• Measured by the kernel: bore Ø12, keyway 4 mm wide, keyway floor at 7.8 mm, hub Ø32, hub top at 22 mm. All five match what was asked.
• Four features: the gear profile, the gear, the hub profile and the hub. Change the tooth count or the module later and the gear rebuilds.

Genie also said what it didn’t check separately: the tooth profile and the face width.

Why it helps

• Standards are looked up, not remembered. Keyways, clearance holes, bearing sizes and screw sizes come from the standards tables, and Genie names the row it used.
• Engineering parts in seconds. Gears, pulleys, shafts, bushings, flanges and brackets are quick to ask for and quick to change.
• Ready for the next step: put it in an assembly, mate it to a shaft, or run a stress study on a tooth.

Try it: ask for a gear by module and tooth count, and add the bore and keyway you need. A matching pinion is one more sentence: the same module, and the tooth count your ratio needs.