Joe:
Steve K7LXC told me of his trick to get the bottom section of a
self-supporting tower plumb. The remaining sections should follow along
plumb as a result. I used his method when I built my Trylon in 2001.
Before you pour the concrete around the bottom section's stub legs,
fashion a T with two pieces of scrap wood. The T should be large enough
that you can rest it on top of the legs of the bottom section. From the
center of this T (and the center is NOT the middle of the vertical piece but
closer to the horizontal piece), suspend a weight on a plumb line long
enough to reach the bottom of the first section.
Move to one face of the tower and sight along the plumb line to the leg
on the opposite corner. Use shims to make the leg parallel to the plumb
line. Next move to another face and repeat the process of sighting along
the line against the opposite leg. Shim again. Do this one more time on
the remaining leg. After a few tries the bottom section should be parallel
to the plumb line on all three sides. Add concrete and watch it dry.
73 de
Gene Smar AD3F
----- Original Message -----
From: "Gary "Joe" Mayfield" <gary_mayfield@hotmail.com>
To: <towertalk@contesting.com>
Sent: Friday, July 30, 2010 10:46 PM
Subject: Re: [TowerTalk] Re Plumbing a Tower
> Okay, I'll finally ask. How do you true up the tapered self-supporting
> tower?
>
> 73,
> Joe kk0sd
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Brahmangou@aol.com
> Sent: Friday, July 30, 2010 11:13 AM
> To: jpk5lad@cox.net; towertalk@contesting.com
> Subject: Re: [TowerTalk] Re Plumbing a Tower
>
> The pan of water will dampen the movement of the plumb bob at the bottom
> of
> the string, but will not help the plumb line to remain vertical and
> straight in the breeze. I use a plumb line regularly at work, and they are
> a
> pain outdoors. Here is an easier way to plumb a tower.
>
> I will use the assistance of a picnic table, ice chest, or anything with a
> surface that is easily leveled placed about the same distance from the
> tower as the tower is tall. On that surface place your framing square
> vertically. If you have the surface of the table level, the square is now
> a
> true
> vertical. The first time you will probably need an assistant to hold the
> square. Have the assistant place a magnetic level on the flat fertical
> surface
> of the square to keep it vertical in that direction also. Place yourself
> in
>
> position so that the tower and vertical edge of the square are in
> alignment. Now look down the edge of the square and compare it to the
> tower. You can
> get amazing accuracy with this method, but takes a little practice.
>
> Marty AB5GU
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