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Zenith-List Digest: 44 Msgs - 07/24/07

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joe(at)kfiz.com
Guest

Posted: Wed Jul 25, 2007 6:16 am Post subject: Zenith-List Digest: 44 Msgs - 07/24/07

Here is a link to the AT-6 which landed on a highway outside of Oshkosh with 

an engine failure.



http://ugv.abcnews.go.com/Player.aspx?id=541864

Joe in Oshkosh

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ifly4fun2(at)sbcglobal.ne
Guest

Posted: Wed Jul 25, 2007 4:43 pm Post subject: Zenith-List Digest: 44 Msgs - 07/24/07

[quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Jul 25, 2007 8:08 pm Post subject: Zenith-List Digest: 44 Msgs - 07/24/07

You are right about the size of the square pegs.  !/4 inch will be for small

wrenches and a little device called a torque meter.  Great for torque that

can be attained with a screwdriver size handle.

Next is the 3/8" that is you 20 - 200+ in.lb...   The 1/2 will generally be

10 - 200+ft.lb..



There are a few different types of torque wrenches.  The one that you have

seen in your local car dealership is the click type.  You adjust the torque

required by turning in out a spring inside the handle. At the appropriate

torque you will hear a click designating the torque has been met.  The down

side of this wrench is it really should be calibrated every so often (

annually ) and it cannot be used for friction torque where you add the

torque required just to turn the fibre lock nut on a bolt.  The click style

wrench is handy because it does have a ratchet drive.  Remember to always

release the tension on the spring before storing your wrench.



The next is the digital torque wrench.  This wrench has a load cell built

into the handle.  You tell it how much torque you want to apply and it will

vibrate or beep at you when the torque is met.  Calibration is electronic

and can be checked annually but by and large should be accurate to less than

1% error.  I'm not sure if it can meter the drag for friction torque.



The last is the beam wrench.  This is a larger wrench which has a pointer

attached to the drive end. Torque is measured by the flex in the handle of

the wrench.  It is easy to use this wrench for friction torque and it almost

never will require calibration ( don't drive over it with the pickup!!) You

may find versions of the beam wrench with dial readings etc. generally they

have no moving parts and are there fore cheaper.



Best advice is to get the 1/4 in. torque meter to measure friction torque.

Get the 3/8 wrench either beam or click style to do about 99% of the work on

your plane. And borrow a 1/2" torque wrench when ever you really need it.



Torque wrenches should never be used to remove nuts or bolts only to tighten

them.  Click style should be calibrated and have the tension slacked off for

storage.  When torquing a nut/bolt with the click style wrench as soon as

the click is heard the fastener is torqued.  Clicking two or three times

doesn't help.



Noel

 

 	  Quote: 	
		   

 Time: 07:10:27 PM PST US

 From: "Carlos Sa" <carlossa52(at)gmail.com>

 Subject: torque wrench

 

 Hello, all

 

 

 I am ready to acquire a torque wrench. (Actually, it'll have 

 to be two -

 read on.)

 I took a look on the net and found a wide range of prices 

 (from around $30

 to many hundreds).

 Then I searched the Z-list archives and found several tips. 

 This one, in

 response to a query from Bill Morelli is on top of my list:

 

 *I have two torque wrenches.  One 20 to 200 Inch/Lbs.  The 

 other is 10 to 150

 Foot/Lbs.

 Bought them from JC Whitney $22 for one and $24 (US) for the other.

 

 Leo Gates*

 

 These wrenches are still in the approximate price range, even 

 though the

 posting dates to July 31, 1998!

 http://www.jcwhitney.com

 

 QUESTION: the specs mention 1/4" and 1/2" drive (and some 

 others 3/8").  Is

 that the size of the square "peg" where the socket inserts?

 

 Thanks in advance

 

 Carlos

 CH601-HD, plans

 Montreal, Canada

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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