[TowerTalk] Rohn 45 Tower Bolts Torque Setting

[hanslg at aol.com]

 Yes, I would also worry about the stretch of my tower bolts if my tower was jumping up and down 6500 times a minute.

If you want to be that precise you have to worry about the exact hardening of the bolt as that will affect the force-stretch curve. The exact diameter also comes in as a factor too. Huu!

Again, the only time I know about a need to know the force a bolt was applying was when the friction between the two fastened pieces were important (which is not the case with our towers, at least not mine). That also required an established routing to prepare the two friction surfaces. (I only seen this once and believe it was not used much due to the rather complicated procedure and possibilities for errors.)

Anything more?

Hans - N2JFS

 


 

 

-----Original Message-----
From: Robert Chudek - K0RC <k0rc at citlink.net>
To: towertalk at contesting.com
Sent: Fri, Apr 30, 2010 1:04 pm
Subject: Re: [TowerTalk] Rohn 45 Tower Bolts Torque Setting


There is an interesting article about this, here: http://www.carcraft.com/techarticles/116_0609_using_rod_bolt_stretch_tool/index.html

I'll have to check my tower bolts to see if they have the "dimples" on both ends 
for centering the gauge.

73 de Bob - KØRC in MN




Message: 1
Date: Thu, 29 Apr 2010 13:39:27 -0700 (PDT)
From: Steven Kerns <n3fti at yahoo.com>
Subject: Re: [TowerTalk] Rohn 45 Tower Bolts Torque Setting
To: towertalk at contesting.com
Message-ID: <430261.84761.qm at web43135.mail.sp1.yahoo.com>
Content-Type: text/plain; charset=us-ascii

Mark,

Using torque measurement is not accurate because of friction related to 
different surface tensions of the fasteners and the difference in lubricants.

To get an an accurate measurement you should read the bolt stretch with a dial 
indicator using a bolt stretch gauge.  One can be purchased here:  
http://www.summitracing.com/parts/ARP-100-9942/  ;-)

Steve, N3FTI
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