Today we'll tackle the problem of coil stability in a new way.
Here is a new 10' section of schedule 40 4" Cantex, ready for cleaning. Scotch-Brite and windshield washer fluid are used to remove small surface nicks and dirt.
The two black plastic brackets holding the tube are called base spacers in Cantex-speak, part number
5355969, and are not very expensive. They come in very handy if you do any work with 4" material.
After cleaning, a protractor is attached to the bell end of the tube.
have two end points for the next step, snapping a chalk line.
Dynaflex 230 caulking compound, purchased from the Home Depot. Please read the instructions on the container. This stuff sticks to PVC and is useful over a wide temperature range. You may want to make a practice run first. Try putting down a bead about 1/10 of an inch in diameter.Then use a latex glove or wrap your index finger in plastic wrap and smooth out the caulk manually. The goal is to make a small adhesive pad for the coiled wire. Give the Dynaflex 5 minutes to set up before removing the tape.
The thin caulk line presents a low profile on the tube. Next, we wind the coil.
Why Cantex ?
Why Cantex ?
Their material is UV-stabilized for weathering strength in the changing climate of Northern Ohio. It also machines and drills consistently. The dielectric constant is the same from piece to piece, and the Cantex compound resists bending. I've filled a dumpster with look-alike parts that failed to survive the coiling process at some point.
See http://www.cantexinc.com for specifications.
The information presented here is accurate and true to the best of the author's knowledge. All recommendations and statements are made without guarantee on the part of the author. The author disclaims any liability in connection with the use of this information.