Learn/Shape Generator/Built-in profiles
Sprocket
At a glance
- ANSI roller chain: #25, #35, #40, #41, #50, #60, #80, #100, #120, #140, #160
- Motorcycle/Powersports: 420, 428, 520, 525, 530, 630
- ISO B-series: 06B, 08B, 10B, 12B, 16B
- Custom pitch and roller diameter
- Set tooth count and bore diameter; displays computed pitch diameter and OD
The Sprocket shape (Power Transmission category) generates roller-chain sprocket profiles ready to cut — go-kart axle sprockets, motorcycle rears, conveyor drives. Open the Shape Generator dialog in any workspace and pick Sprocket; choosing a chain standard fills in the pitch and roller diameter for you.
Chain standards
The Standard dropdown covers three families plus Custom:
- ANSI: #25, #35, #40, #41, #50, #60, #80, #100, #120, #140, #160
- Motorcycle / powersports: 420, 428, 520, 525, 530, 630
- ISO B-series (British Standard / DIN): 06B, 08B, 10B, 12B, 16B
Each preset loads its pitch and roller diameter into the Pitch and Roller Dia fields — which stay editable, so Custom is just those two numbers entered directly from your chain's spec sheet. The default is ANSI #40 (0.500 in pitch, 0.312 in roller).
Parameters and geometry
Set Num Teeth (default 16, minimum 6) and Bore Dia (default 0.500 in; set 0 for no bore).
The tooth form is an arc-groove profile: each roller seat is a true arc centered on the pitch
circle, cut at the roller radius plus 0.003 in of running clearance, with straight flanks rising
to the tooth tips. Pitch radius follows the standard roller-chain relation — chain pitch divided
by 2·sin(180°/N) — so the chain wraps at the correct diameter regardless of tooth count.
Tips
- Seats are true arcs and flanks are lines, so the toolpath posts as clean G2/G3 — no faceting.
- Cut the bore undersize and finish it to the shaft; plasma kerf and taper matter more at the bore than anywhere else on a sprocket.
- Need a matching chain guard or mounting plate? Generate the sprocket first, then build around it in the same sketch — see where the generator appears.