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gareywittich2000(at)yahoo
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 Posted: Wed Jun 03, 2009 7:31 pm Post subject: Rod End Bearing Jam Nut - TORQUE |
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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
[quote][b]
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gareywittich2000(at)yahoo
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| Posted: Fri Jun 05, 2009 9:27 am Post subject: ROD END BEARING JAM NUT - Torque |
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For you Experts:
Installed the Rod End Bearings in the Rudder and Elevator 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 (in the Spar channel), it is impossible to get a wrench "squarely" on it = any further tightening of the Nut starts 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's scale are inaccurate. So how do you measure "LOW VALUES" for an AN3 Nut that requires 20 - 25 in/lbs plus Friction Torque of approx 5 in/lbs = 25 to 30 on/lbs TOTAL torque ??
Appreciate your help,
Garey Santa Monica, CA
[quote][b]
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Bruce(at)glasair.org
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| Posted: Fri Jun 05, 2009 9:53 am Post subject: ROD END BEARING JAM NUT - Torque |
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Send your wrist out for calibration. (Sorry, I couldn’t help it.)
Bruce
www.Glasair.org
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sat Jun 06, 2009 4:44 am Post subject: ROD END BEARING JAM NUT - Torque |
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Yes. If that is sufficiently tight for your calibrated wrist and ability to hold wrench on nut, it isn't going anywhere.
Garey Wittich wrote: | Quote: |
. Is this 1/8 turn adequate for the Jam Nut tightness, if NOT how do you turn the Nut (since it is recessed) ????
W
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[img]cid:part1.07050607.08020000(at)aviating.com[/img]
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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n223rv(at)wolflakeairport
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| Posted: Sat Jun 06, 2009 5:24 am Post subject: ROD END BEARING JAM NUT - Torque |
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Why would you not use the standard torque specified for a bolt/nut of the size being torqued?? Like if it is 10-24 then it would be 20-25 in lbs.... Etc
Sent from my iPhone
On Jun 6, 2009, at 8:40 AM, Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)> wrote:
[quote] Yes. If that is sufficiently tight for your calibrated wrist and ability to hold wrench on nut, it isn't going anywhere.
Garey Wittich wrote: | Quote: |
. Is this 1/8 turn adequate for the Jam Nut tightness, if NOT how do you turn the Nut (since it is recessed) ????
W
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<mime-attachment.jpeg>
[b]
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sat Jun 06, 2009 5:42 am Post subject: ROD END BEARING JAM NUT - Torque |
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There are places that no torque wrench and extensions are going to
reach. Experience can get you real close. For example, 3/4 of a turn
from first contact on an oil filter will get you proper torque every time.
Michael Kraus wrote:
| Quote: | Why would you not use the standard torque specified for a bolt/nut of
the size being torqued?? Like if it is 10-24 then it would be 20-25
in lbs.... Etc
Sent from my iPhone
On Jun 6, 2009, at 8:40 AM, Kelly McMullen <kellym(at)aviating.com
<mailto:kellym(at)aviating.com>> wrote:
> Yes. If that is sufficiently tight for your calibrated wrist and
> ability to hold wrench on nut, it isn't going anywhere.
>
> Garey Wittich wrote:
>>
>> . Is this 1/8 turn adequate for the Jam Nut tightness, if NOT how
>> do you turn the Nut (since it is recessed) ????
>>
>> W
>>
> <mime-attachment.jpeg>
*
*
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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khorton01(at)rogers.com
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| Posted: Sat Jun 06, 2009 9:44 am Post subject: ROD END BEARING JAM NUT - Torque |
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If you could get a torque wrench on it, you would want to use a torque
value for a shear nut. E.g., if it was 10-24, you would want 12-15 in-
lb, according to the torque table in AC43.13-1B.
Kevin Horton
On 6-Jun-09, at 09:25 , Michael Kraus wrote:
| Quote: | Why would you not use the standard torque specified for a bolt/nut
of the size being torqued?? Like if it is 10-24 then it would be
20-25 in lbs.... Etc
Sent from my iPhone
On Jun 6, 2009, at 8:40 AM, Kelly McMullen <kellym(at)aviating.com>
wrote:
> Yes. If that is sufficiently tight for your calibrated wrist and
> ability to hold wrench on nut, it isn't going anywhere.
>
> Garey Wittich wrote:
>>
>>
>> . Is this 1/8 turn adequate for the Jam Nut tightness, if NOT how
>> do you turn the Nut (since it is recessed) ????
>>
>> W
> <mime-attachment.jpeg>
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Kevin Horton
Ottawa, Canada
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