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chris Sinfield
Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia
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 Posted: Sat Jun 05, 2010 3:29 am Post subject: AN-3 nyloc nut torque |
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people
what torque are you doing these little nuts up to with the .125 th spar plate?
on the AC43-13B it talks about 25"lb. Zenith construction standards the same. Problem is they are still loose when the torque wrench clicks, not bottomed out, loose.
some one suggested adding the friction TQ of the nut. to the published TQ
The good book AC 43 said max 40"lb. So what have others been using as the TQ value?? At 40 its firm and you can still move the whole bolt and nut a little with a spanner if u rotate the head.
the A4's are OK just the little A3's that worry me, logic says you should not be able to move the bolt when done up to the correct torque.
Am I over worried?
Chris.
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Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
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| Posted: Sat Jun 05, 2010 4:01 am Post subject: AN-3 nyloc nut torque |
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Hi Chris
I used the info from Zenair's construction standard CS#407, which says:
| Quote: | Drag torque. Run the nut down to near contact with the washer and check
the friction drag torque required to turn the nut. Add the drag torque to
the desired torque. This is referred to as the final torque which should
register on the indicator or setting on the torque wrench.
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And, as you note, CS#407 specifies 20-25 in-lbs for AN3's with AN365 nuts.
The problem is, I do not see any way to measure the drag torque with a
"click" type torque wrench. So I chose a "beam" type wrench, the Park TW-1,
IIRC. It is actually sold as a bike tool, ~$40 USD.
With my bolts, nuts, and wrench, I measure a drag torque of ~4 in-lb, so I
torqued my AN3 to between 25 and 30 in-lb. That nut and bolt seem to be
plenty tight to me. Perhaps your click wrench is not accurate in the low
in-lb ranges.
Terry
At 04:29 AM 6/5/2010 -0700, you wrote:
| Quote: | people
what torque are you doing these little nuts up to with the .125 th spar plate?
on the AC43-13B it talks about 25"lb. Zenith construction standards the
same. Problem is they are still loose when the torque wrench clicks, not
bottomed out, loose.
some one suggested adding the friction TQ of the nut. to the published TQ
The good book AC 43 said max 40"lb. So what have others been using as the
TQ value?? At 40 its firm and you can still move the whole bolt and nut a
little with a spanner if u rotate the head.
the A4's are OK just the little A3's that worry me, logic says you should
not be able to move the bolt when done up to the correct torque.
Am I over worried?
Chris.
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Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail & flaps are done;
Upgrading wings & ailerons per the AMD Safety Directive
http://www.mykitlog.com/N47TP/
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_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
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floyd wilkes
Joined: 11 Jun 2007
Posts: 39
Location: spring branch, tx
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| Posted: Sat Jun 05, 2010 4:38 am Post subject: AN-3 nyloc nut torque |
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Chris,
Make sure you have the correct length bolt. If the bolt is too long, the
nut will hit the shoulder and not allow it to become tight. You are correct
you will not be able to move the bolt if all is right.
Floyd Wilkes
601XL
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Floyd Wilkes |
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