Library › Mechanisms › Open flat belt and two pulleys

Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

parameter	pulleys
value	Ø40 and Ø80, flanged

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

From the full sheet

Open flat belt and two pulleys (2 : 1): every size, notes, mating features and sources. How do you work out a belt drive's ratio and length?