Re: Torque meter bearing?

From: Andras REE <ree_at_eik.bme.hu>
Date: Tue, 20 Apr 2010 08:45:14 +0200

Tapio,
Besides to have enough clearance, do not apply grease or other
lubricant. In case you need I can send you a sketch about our solution
which works perfect since 1968 when I made the first one. The 1.5 mm
steel pin is running on two narrow, edge-like cylindrical surfaces, each
is 1 mm wide and there is 10 mm distance between the two. The hole is
1.6 mm. The torsion steel wire diameter for F1D is 0.35 mm, the length
is 120 mm.
Regards
Andras

On 2010. 04. 19. 14:26, Tapio Linkosalo wrote:
>
> 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 - 23:47:18 CEST