Hi,
I don't have a Ham IV, but I have a little experience with keeping bolts
tight that are threaded into aluminum. The solution for aluminum heads on
racing engines (VERY expensive) is to tap all the threads for heli-coils and
then thread the bolts into them. They're not really that hard to install
either...
You won't ever have to worry about having the rotor apart enough times to
wear one out.
This would beat finding pieces on the ground...
You can take a look here
http://www.emhart.com/products/helicoil/Default.htm
73,
George / KF9YR
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of David O Hachadorian
Sent: Tuesday, November 06, 2001 2:09 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Ham-M IV Refurb?
On Tue, 6 Nov 2001 19:32:53 -0700 "Steve/n0tu" <n0tu@webaccess.net>
writes:
>
> Tower is going up soon. What's the drill on refurbing the Ham-m IV?
> I'm not sure this unit really needs any work as of yet.
If it's not broke, don't fix it. Every time you remove those
four self-tapping screws that hold the two halves of the
housing together, a little bit of aluminum comes out of the
upper housing with the steel screws. Eventually, the screws
will loosen to the point that they can work themselves out of the
housing. It's rather embarrassing to find the four bolts lying on the
ground, the lower housing sitting stationary on the rotor plate, and the
antenna, mast, and upper housing freewheeling in the wind. Those
self-tapping screws are
a weak point in the design of the Ham-IV, and are a major reason
to use a T2X instead, which uses steel nuts and bolts to hold the
housing together.
> I have a run of almost 300' to the tower, and I thinking of mounting
> the
> rotor starting cap in a junction box at the base. Thoughts?
Not a bad idea, then you can use two runs of Romex for the other
six wires.
Dave Hachadorian, K6LL
Yuma, AZ
K6LL@juno.com
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