Globoid worm gearbox (20:1) with ball bearings (backdrivable)
thingiverse
This work is inspired by [RollerDrive by Sankyo-Seisakusho](https://www.sankyo-seisakusho.co.jp/english/technology/technology05.html). BOM: - 683 ball bearing (3x7x3) - 20 pcs - 608 ball bearing (8x22x7)- 4 pcs - M3x10 screw - 20 pcs - M3 nut - 20 pcs - M4x10 screw - 4 pcs - M4 nut - 4 pcs Driving the gearbox: - by a hand - by an electric motor (BLDC, stepper, DC, etc.): + there is a 6 mm hex shaft on the one end of worm + and 5 mm hole (with 4.5 mm flat) on the other side GM3408H BLDC motor is used in the demo video. The gearbox is back-drivable, please note that print quality is very important for this feature. The design had been done completely in FreeCAD Part Design and Part workbenches (and Assembly3), without using any scripting. I used the [LinkDaily branch.](https://github.com/realthunder/FreeCAD/releases)
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