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chromating bolts

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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by Dave Klimas
Correct me if I am wrong, but shouldn't the final torque value be
from the torque tables for hardware in use plus the torque required
to move the elastic stop nut?


In regard to chromating bolts, no-one makes mention of chromating the
threads of the bolt and nut. Tightening bolts without lubrication can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

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Ramona, CA
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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by Doug Martin
DO NOT lube lock nuts.

At 12:46 PM 1/30/2000 -0500, you wrote:
In regard to chromating bolts, no-one makes mention of chromating the
threads of the bolt and nut. Tightening bolts without lubrication can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

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Doug Martin
greyghost@powernet.net
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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by Peter & Monica
In regard to chromating bolts, no-one makes mention of chromating the
threads of the bolt and nut. Tightening bolts without lubrication can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

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between builders and owners of Murphy Rebel aircraft.
Archives located at:
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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by Wayne G. O'Shea
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Hi Peter,
Torque values given for different sizes or bolts are for clean, dry
hardware. They are not supposed to be lubricated on the threads. Would
defeat the purpose of having a lock nut. Chromate the underside of the head
and the shank to protect the bolt, until just where the threads start. Then
install the washer, nut and torque. You could then coat the outside of the
nut/washer area to keep the water out also, if you wanted too!

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

-----Original Message-----
From: Peter & Monica <capete@sympatico.ca>
To: murphy <murphy-rebel@dcsol.com>
Date: Sunday, January 30, 2000 12:50 PM
Subject: chromating bolts

In regard to chromating bolts, no-one makes mention of chromating the
threads of the bolt and nut. Tightening bolts without lubrication can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*




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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by T L McClary
Couldn't help but check AC 43.13-1A, though I don't have the latest
edition. In Chapter 5, Aircraft Hardware, 227.e. Torques

1. Calibrate the torque wrench periodically to assure accureacy; and
re-check frequently
2. Be sure that bolt and nut threads are clean and dry (unless otherwise
specified by the manufacturer.
3. Run nut down to near contact with the washer or bearing surface and
check "friction drag torque" required to turn the nut.
4. Add the friction drag torque to the desired torque recommended by the
manufacturer, or obtain desired torqued as shown in figure 5.2. This is
referred to as final torque which should register on the indicator or the
setting for a snapover type wrench.
5. Apply a smooth even pull when applying torque pressure. If chattering
or a jerking motion occurs during final torque, back off and re-torque.
6. When installing a castle nut, start alignment with the cotter pin hole
at mminimum recommended torque, plus friction drag. If the hole and nut
castellation do not aligh, change washers and try again. Exceeding the
maximum recommended torque is not recommended.
7. If torque is applied to capscrews or boltheads, apply recommended
torque plus friciton drag torque as determined in step (3).
8. If special adapters are used which will change the effect length of
the torque wrench, the final torque indiciation or wrench setting must be
adjusted accordingly. Determine the torque wrench indication or setting
with adapter installed as shown in figure 5.3. Figure 5.2 is a composite
chart or recommended torque to be used when specific torque is not
recommended by the manufacturer. The chart includes standard nut and
bolt combinations currently used in aviaion maintenance.

Well there it is from the FAA. Looks like the correct value is running
torque ("friction drag") plus desired torque recomended by manufacturer.

Terry
Rebel #666

On Sun, 30 Jan 2000 12:58:11 -0800 Dave Klimas <drk@cts.com> writes:
Correct me if I am wrong, but shouldn't the final torque value be
from the torque tables for hardware in use plus the torque required
to move the elastic stop nut?


In regard to chromating bolts, no-one makes mention of chromating
the
threads of the bolt and nut. Tightening bolts without lubrication
can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to
end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
Dave & Bert Klimas
Rebel #472
Ramona, CA
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
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chromating bolts

Posted: Fri Feb 17, 2012 5:40 pm
by T L McClary
After I sent the excerpt from the AC I checked the "Standard Aviation
Maintenance Handbook." It has 2 charts for self-locking nuts, one with
fine thread and the other with coarse. Give me the sizes you are looking
for and I will put the values on the list.

Terry
Rebel #666

On Sun, 30 Jan 2000 12:58:11 -0800 Dave Klimas <drk@cts.com> writes:
Correct me if I am wrong, but shouldn't the final torque value be
from the torque tables for hardware in use plus the torque required
to move the elastic stop nut?


In regard to chromating bolts, no-one makes mention of chromating
the
threads of the bolt and nut. Tightening bolts without lubrication
can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to
end
up with the proper torque.

Anyone have any comments on that?

Peter Kopasovic
SR003

*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
Dave & Bert Klimas
Rebel #472
Ramona, CA
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
________________________________________________________________
YOU'RE PAYING TOO MUCH FOR THE INTERNET!
Juno now offers FREE Internet Access!
Try it today - there's no risk! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*




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