Vasa Ergometer Pulley Upgrade

thingiverse

Upgrade your Vasa Ergometer drive and rewind pulleys to smoother, lower friction pulleys. This upgrade improves rewind cord responsiveness and reduces localized drive and rewind cord wear. If your ergometer is over a year old, this upgrade can significantly smooth its operation. Stock bearings are simple metal sleeves that experience increasing friction as they age. Even with cleaning and lubrication, stock sleeve bearings quickly degrade in functionality compared to roller bearings. This pulley upgrade provides several key benefits: - A larger diameter drive pulley reduces drive cord flex. - Real ball bearings replace worn-out stock sleeve bushings. - Lower friction pulley bearings allow the entire rewind cord to stretch rather than just a portion of it. - Longer service intervals are achieved at reduced friction levels. - Improved pulley profiles match round cords for smoother operation. Additional parts required: 16 x R4-2RS (1/4" x 5/8" x 0.196") bearings - available on Amazon at https://www.amazon.com/gp/product/B077SPSVD1 6 x 608-2RS (8mm x 22mm x 7mm) bearings - available on Amazon at https://www.amazon.com/gp/product/B07C6FL8TW 2 x 1/4 inch bolt, 3/4 inch length 2 x 1/4 inch nut 4 x 1/4 inch washers with a diameter of 1/2 to 5/8 inch Sanding of the drive cord bracket pulley is easier using a combination of a 3 inch x 1/4 bolt, washers, and nut along with printed sanding clamp ends. For a complete pulley system overhaul, print: Preferably in polycarbonate or nylon: - Drive cord bracket pulley (2 needed) The remainder of the parts can be printed in PETG: - Drive cord pulley sanding clamp end (2 needed) - Rewind stack pulley (16 needed) - Rewind director pulley (2 needed) - Rewind stack spacers (20 needed) - Drive cord bolt sleeve (2 needed)