My thanks for the replies to my queries.
I've learn't a lot about how these masts are assembled. I had the rope and
pulley system figured out, but wasn't sure about the key, particularly how it
was fastened to the tube. The photos from the eBay site were very helpful.
I'd given away welding for two reasons
1) damage to the zinc galvanizing on the tube, and
2) more importantly, the unavoidable curvature which would develop from welding
distortion. The tubes would no longer be straight.
The answer obviously is -- no welding.
Being in a fairly windy locality on a coastline, I'm concerned about both the
lateral forces on the key and it's fastening to the tube, and protection from
corrosion.
I'd be grateful for some information on the size and spacing of the screws
attaching the key, and of the size of the key itself. If I make these too
light or insufficient in number, then I could experience damage from rotation
of the mast by winds.
Is the key galvanized, or has the whole assembly been hot-dip galvanized after
assembly?
I've built the foundation, base, and the tilting arrangement, they're
adequately sized.
Just have to get this project completed.
Thanks de MikeN ZL1BNB
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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