Torque Meter

thingiverse

This is a torque meter designed specifically for indoor free flight models. Its design is heavily influenced by the Flite-Tork meter, originally developed by Bill Gowen. This meter measures torque in inch/ounces. UPDATE 8/5/19: I recently replaced the Teflon bushings in my torque meter with roller bearings, which have made it more sensitive and accurate. The roller bearings are a direct fit replacement for the Teflon bushings, so no modifications to the torque meter are required for anyone who wants to upgrade. Simply press out the old bushings and press in the new bearings. I've included links to roller bearings from eBay and McMaster below. UPDATE 11/24/17: I've refined some of the parts and added a version of the collar that works with 1/8" RC airplane wheel collars, which can be found at hobby shops. To build this meter, you'll need one of each printed part plus an extra collar. You'll also need the following components: 2 - M3 x 20 screws (for mounting the load cell) 3 - 1/8" stop collars (McMaster P/N 6432K17) or 1/8" RC airplane wheel collars 2 - 6-32 x 3/16" set screws (4-40 x 3/16 set screws if using wheel collars) 1 - 6-32 x 1-1/16" piece of threaded rod (4-40 if using wheel collars) 2 - 6-32 nuts (4-40 if using wheel collars) 1 - M4 fender washer (or a washer with an approximate diameter of 7/16") 1 - 2xAAA battery holder (McMaster P/N 7712K16) 1 - TBBSC 200g scale (Amazon) 1 - 1.75" long piece of 1/8" music wire or shaft (McMaster P/N 1257K83) 1 - Piece of music wire for the hook 1 - Piece of 1/4" OD Rulon J bearing sliced in half (McMaster P/N 6377K48) or 1/4" OD x 1/8" ID Teflon tube 2 - Needle roller bearings, 1/8" x 1/4" x 1/4". An alternative to Rulon J or Teflon is available at (https://ebay.us/bDHIOt) or (https://www.mcmaster.com/5905k331). For detailed assembly instructions, refer to this thread: http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=22468.0