Tapio,
Check out this interesting torque meter idea on this discussion:
http://www.hippocketaeronautics.com/hpa_forum/index.php/topic,3650.25.html
Should be right up your alley. A 1" long rotating wire arm set perpindicular to the main shaft (on bearings) contacts a digital gram scale so that torque in in/oz can be read off directly. Anyone have any experience with something similar?
Tony
To: Indoor_Construction_at_yahoogroups.com
From: tapio.linkosalo_at_iki.fi
Date: Mon, 19 Apr 2010 15:26:15 +0300
Subject: [Indoor_Construction] Torque meter bearing?
I have two torque meters, both constructed from different diameters of
brass tubing to house a torque wire. The larger for F1M and similar is
built by a friend and works very nicely, but my copy for F1D is not as
sensitive as I would wish it to be. It is somewhat difficult to make
sure that the zero level is as it should be, and also I have concerns
about the accuracy vs. sensitivity. Looks like a brass tubing rotating
in another one has too much friction for the small forces we are
measuring here. I even tried to dremel the inner tubing so that it has
the bearing surfaces at the very ends of the tubing, but it did not help
much.
So any suggestions for improving the bearing? Would teflon or nylon make
a more sensitive bearing, or should I replace the sliding bearing with a
ball bearing?
The other end is no problem as I use O-rings and have that fixed; do not
need to have the meter for unwinding rubber.
-Tapio-
Received on Tue Apr 20 2010 - 05:57:45 CEST