Re: Torque meter bearing?

From: <RLBailey_at_care4free.net>
Date: Wed, 21 Apr 2010 10:56:14 +0100

My torque meter uses the simplest of bearings - one brass tube inside another. Oil regularly with thin general purpose oil (3 in 1 in UK) and the meter works well. If the needle shows signs of not returning properly to zero, get the oilcan out again.

I use a long wire; plenty of needle movement without risk of overloading the wire; essential to maintain consistency of operation.

Bob

----- Original Message -----
  From: Bill Gowen
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Monday, April 19, 2010 4:36 PM
  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_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 Wed Apr 21 2010 - 02:56:18 CEST