Re: Torque meter bearing?

From: Tapio Linkosalo <tapio.linkosalo_at_iki.fi>
Date: Wed, 21 Apr 2010 16:42:37 +0300

Bill Gowen wrote:
> 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.

Andras REE wrote:
> 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.

Ok, I think my problem is the lack of clearance & too much bearing
surface area. Soldered a piece of 2mm OD tubing to the hook, to rotate
in a 2mmID tubing. Obviously that does not work, but should have made
the 1mm hook to rotate in a short bushing.

But before making much modifications, I'll try the digital TQ meter, as
suggested in the link sent by Tony. If I just would find a load sensor,
that I could attach to a handheld computer; it would be nice to get
graphs how the TQ develops during winding. Unfortunately all the piezo
sensors that I have found are rather in the kg than g scale, way too
much load to measure indoor rubber torque...



-tapio-
Received on Wed Apr 21 2010 - 06:43:00 CEST