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@citlink.net>
To: towertalk@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@yahoo.com>
Subject: Re: [TowerTalk] Rohn 45 Tower Bolts Torque Setting
To: towertalk@contesting.com
Message-ID: <430261.84761.qm@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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