Sprocket Designer Ver. 1.0.4 · built 2026-10-16 07:26
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    Dimensions
    📂 Import Design

    Every SVG, DXF, STL and STEP file exported from this tool contains its design's settings — both sprockets and the drive. Selecting one here reads them and puts the page back as it was when the file was downloaded.

    Threaded screw holes

    How tight a hole a set screw cuts its own thread into: it depends on your printer and filament, not on the sprocket. It applies to every set screw held by Tapping the plastic, on both sprockets, and is saved with each design; new designs start from your default. Captured nuts pass through a plain clearance hole and heat-set inserts use the hole you enter, so these settings don't change them.

    Looking into an M5 hole: the screw's outer and root diameters over the hole that is cut
    0% = the screw's outer diameter (no grip) · 100% = its root diameter (full thread)
    Hub pin strength

    The most torque the hub pins carry from the tooth layers to the hub. Three things can give: the pins shear where they cross into the hub, or they crush the holes in the sprocket or in the hub. The lowest of the three, over the safety factor, is the maximum operating torque.

    Material values are typical (estimates), for parts printed flat as this app makes them; bearing is taken as the printed walls' tensile strength. Printed plastic creeps under a steady load, so keep the safety factor up for a constant torque. The bore's key, flat or set screw, from hub to shaft, is not rated here.

    ⚠ Report A Bug
    CheapCADTools — Software Design Philosophy
    Don't try to catch every setting that could make a part go wrong. Over-constraining the inputs leads to a poor user experience — for example, typing a number only to have the software reject it with a cryptic message. If you enter a value that produces a strange result, simply go back and try a smaller change.