Roberval Balance with Bearings

thingiverse

This remix redesigns Eckard College's Roverbal Balance, as described in the linked source file.\r\n\r\nTo enhance durability, a 608 ball bearing replaces the joint made of printer plastic. These bearings are widely available; one option can be found at https://www.thebigbearingstore.com/608-2rs-608-zz-radial-ball-bearing-8x22x7-skate-bearing/. Another option is listed on Amazon at https://www.amazon.com/gp/product/B06XTZJDCC.\r\n\r\nWhile the unshielded bearing offers lower friction, it's not necessary for this application.\r\n\r\nAdditional parts enable three modifications to the balance. The first modification uses a bent crossbar, reducing energy when the balance is in its center position, more closely resembling real two-pan balances. The balance remains insensitive to weight placement, but the center position clearly indicates equal masses on each side.\r\n\r\nThe second modification replaces one side with a lever, making it act like a beam balance. Note that the "tee" connector's vertical constraint still maintains insensitivity to mass location, while the "beam" side's precise mass placement determines when the device is in balance, acting as a seesaw.\r\n\r\nThe third modification combines both previous designs, featuring bent-arm construction and a beam-balance side. This version can act like a beam balance and also self-center when in balance.