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Rod End Bearing Jam Nut - TORQUE

 
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gareywittich2000(at)yahoo
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PostPosted: Wed Jun 03, 2009 7:31 pm    Post subject: Rod End Bearing Jam Nut - TORQUE Reply with quote
For you Experts:

Installed the Rod End Bearings in the Rudder and Elevators today.  My local A&P said to tighten the Jam Nut by "Hand Tightening" the Jam Nut as far as it will go, then turn the nut between 1/4 and 1/2 turn more.
I "hand tightened" the Jam Nut (as the A&P said), but could not get it to tighten more than an additional 1/8 turn.  Because the Jam Nut is recessed, it is impossible to get a wrench squarely on it = any further turning of the Nut stars to round the corners of the Nut.  Is this 1/8 turn adequate for the Jam Nut tightness, if not how do you turn the Nut (since it is recessed) ??
What Torque Value is required for the Jam Nut, assuming a Torque Wrench can get into the recessed area - do not see how this can be done.
ANOTHER QUESTION - 
Have a "click type" torque wrench that starts at 20 in-lbs.  From previous posts, the FIRST 1/6 and the LAST 1/6 of the Wrench Scale are inaccurate.  So how do you measure 'LOW VALUES" like for AN3 bolts that require 20 -  25 in/lbs plus Friction Torque of approx 5 in/lbs = 25 to 30 in/lbs TOTAL TORQUE ??? 
Appreciate your help,
Garey Wittich    Santa Monica, CA    
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lrhelming(at)gmail.com
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PostPosted: Thu Jun 04, 2009 4:22 am    Post subject: Rod End Bearing Jam Nut - TORQUE Reply with quote
Fjor experimental aircraft, you might just Put a drop of locktite on it.  Indiana Larry

On Wed, Jun 3, 2009 at 10:29 PM, Garey Wittich <gareywittich2000(at)yahoo.com (gareywittich2000(at)yahoo.com)> wrote:
Quote:
For you Experts:

Installed the Rod End Bearings in the Rudder and Elevators today.  My local A&P said to tighten the Jam Nut by "Hand Tightening" the Jam Nut as far as it will go, then turn the nut between 1/4 and 1/2 turn more.


I "hand tightened" the Jam Nut (as the A&P said), but could not get it to tighten more than an additional 1/8 turn.  Because the Jam Nut is recessed, it is impossible to get a wrench squarely on it = any further turning of the Nut stars to round the corners of the Nut.  Is this 1/8 turn adequate for the Jam Nut tightness, if not how do you turn the Nut (since it is recessed) ??


What Torque Value is required for the Jam Nut, assuming a Torque Wrench can get into the recessed area - do not see how this can be done.


ANOTHER QUESTION - 
Have a "click type" torque wrench that starts at 20 in-lbs.  From previous posts, the FIRST 1/6 and the LAST 1/6 of the Wrench Scale are inaccurate.  So how do you measure 'LOW VALUES" like for AN3 bolts that require 20 -  25 in/lbs plus Friction Torque of approx 5 in/lbs = 25 to 30 in/lbs TOTAL TORQUE ??? 


Appreciate your help,


Garey Wittich    Santa Monica, CA    
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