Agree with Bill. While Teflon is low friction, clearance to any material has negligible effect on accuracy and is KISS and cheap.
H
To: Indoor_Construction_at_yahoogroups.com
From: wdgowen_at_gmail.com
Date: Mon, 19 Apr 2010 11:36:46 -0400
Subject: Re: [Indoor_Construction] Torque meter bearing?
I've got a really crude bearing on my torque meters and have never had a
problem. I think the key is that you need a loose fit on the bearing. The
needles on my meters vibrate while I'm winding. I take this to be a sign that
the bearing isn't interfering with the reading. I also use long torque wires.
I'm not sure what difference this makes but it seems to work well.
----- Original Message ----From:
Tapio
Linkosalo
To: Indoor_Construction_at_yahoogroups.com
Sent: Monday, April 19, 2010 8:26
AM
Subject: [Indoor_Constru ction] 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-
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Received on Mon Apr 19 2010 - 15:37:24 CEST