Torque Meter

thingiverse

This a torque meter for indoor free flight models. It's design is based largely on the Flite-Tork meter that was originally developed by Bill Gowen. This meter reads torque in inch/ounces. *UPDATE 8/5/19 I recently replaced the Teflon bushings in my torque meter with roller bearings. I believe the torque meter is a little more sensitive and accurate with the bearings. They're a direct fit replacement for the Teflon, so no modifications to the torque meter are necessary for anyone that wants to upgrade. Simply press out the Teflon, and press in the bearings. I've included links to roller bearings from eBay and McMaster below.* *UPDATE 11/24/17 I've refined a few of the parts, and added a version of the collar that works with 1/8" RC airplane wheel collars that you can find at a hobby shop.* To build the meter you need 1 of each printed part plus a second collar. You will also need the following components: 2 - M3 x 20 screws (mounting 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 you're using wheel collars) 1 - 6-32 x 1-1/16" piece of threaded rod (4-40 if you're using wheel collars) 2 - 6-32 nuts (4-40 if you're using wheel collars) 1 - M4 fender washer (or washer of approximate 7/16" diameter) 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 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". Alternative to Rulon J or Teflon (https://ebay.us/bDHIOt) or (https://www.mcmaster.com/5905k331) See this thread for details on assembly. The second torque meter in the thread details assembly of the current version. http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=22468.0