I needed a new base for my WT-51 when I first moved it from Portland to the
OR coast. Looked at the base dwg I had, figured how much time, labor,
material, and new swear words it would take me to build it. Ha, I may be old
but I'm also lazy. Took the dwg up to a local fleet machine/welding shop and
they knocked one out in a day for a little over $200. Included in the deal
was free coffee, a couple of doughnuts and entry to a new set of friends who
have now done a lot of custom work for me at very fair prices. And they are
certified and highly experienced in working with SS's and marine grade al u
min ni um (known as aloom na num to most Americans).
All I had to do was get the hold dug by some young bucks looking for beer
money, build the wood alignment hanger, and pour concrete (from a truck of
course).
Never looked back.
Don W7WLL
-----Original Message-----
From: KJ6Y--- via TowerTalk
Sent: Friday, June 09, 2017 4:56 PM
To: EZRhino@fastmovers.biz ; towertalk@contesting.com
Subject: Re: [TowerTalk] Yet another used W51 (base/foundation) ??? de K6LPM
Well said Chris.
Skip, KJ6Y
In a message dated 6/9/2017 4:43:34 P.M. Pacific Daylight Time,
EZRhino@fastmovers.biz writes:
In the amount of time it took you to type out this treatise, you could
have called Tashjian Towers, ordered a new base, and then still had time
left
over to walk into the kitchen and make a nice turkey and swiss sandwich,
and consume said nutriment.
If you're still wanting to build your own, there is a no-weld solution
that involves anchor bolts set into the wet concrete during the pour, and a
very large piece of 1/2" plate steel with holes drilled for the anchor
bolts.
Then another set of holes are drilled for very large angle, like 3/4"
thick, where one side of the angle bolts into the base plate and the other
side bolt to the tower.
By the time you're done trying to bore a dozen or more 3/4" diameter holes
through steel that thick, you're going to be wishing you had made the
phone call and eaten the sandwich above. Make the call, thank me later.
:-)
Chris
KF7P
On Jun 9, 2017, at 15:50 , southbound suarez wrote:
Seems as if there's a huge proliferation of these towers out there. I'd
dare say probably record production compared to any other Ham/private
consumer tower if you exclude the 25G series.
That said,
Does anyone have any plans or instructions or essentially a how to recipe
for fabricating or securing this old Tri-Ex crankup tower to a foundation?
Ideally some specifications for specific material type selections
(metallurgy) , size/thickness and retail sources for these materials?
Welding
requirement as well as what design considerations or possible critical
failures
that a DYI guy should be aware of?
I am well aware of and respect the fact that this is indeed a critical
application and that there exists some major risks including major
liabilities. The possibilities of a catastrophic failure places strong
risks in the
form of severe property damage,; great bodily injury and possible death.
I believe in good conscious that I have a healthy respect of these facts.
While I am a very handy person with good mechanical apptitude and
experience in construction trades, I know enough that I am far from a
proper
mechanical engineer. I have much to learn of actual loads , stresses and
best
practices.... Experience and hardknocks does have some merit similiarly does
common sense (usually an oxymoron) especially judgement or understanding.
Obviously, "Rocket Science" can be applied to anything and make for great
efficiency, betterment and overall greater safety. (So much better the hit
over miss ratio)
I CAN APPRECIATE THE NUMBERS BEING CRUNCHED! BUT.....
When you look at the designed base of what this tower was shipped when
purchased brand new and even the same with what is being provided by
manufacturer today? Engineering practices and formulations set aside... The
Base
appears as if it is just three 2" wide by 12" long 3/8" mild steel plates.
The
plates tab welded with full bead along there length to about a 24" length
of rebar. Each plate/rebar upright are then welded to a triangular formed
rebar horizontal member. This is then conventionally tie wrapped to the
structual rebar concrete reinforcement... Doesnt seem so exotic or rocket
science to me???
I do understand that there might be some subtle but important things not
so obvious. I consider that there exsists certain forms of weldable rebar
and that heat will anneal steel. Especially mild ductile steel plates.
Certain critical welds must adhere to specific standards...
I fully respect the reasoning for good uniform codes and standards. I
understand about professional peer review and adoption of professional
standards.....
Maybe to everyones benefit we can get a good and educational discussion
going on here. Maybe there's some esteemed slide ruler type that could give
the class a presentation on some of the basic physics and caculations. For
those industrial insiders that govern over the art and practices, how about
a quick review of the most pertinent and applicable sections of the
numerous plethora of codes and overlapping professional disciplines in
which
contribute to the structure of radio amatuers affection. AND..........
Selfishly and ultimately educate me on how to best
construct/obtain/procure the basis (or bases) <pun> for constructing my own
foundation to bolt my
second hand W-51 tower into an upright position that is useful (safe) and
reliable all on my own.....
MY SPECIFICS ....
This will be a non-inspected install with at least 100ft setback in all
directions. No structures or pathways in peril .... simply a private
install
on private land with minimal intrusion by local governing officials...
None the less, I do wish to meet or exceed proper building standards.
Thanks for reading my lengthy and intial posting as a new member of your
excellent and esoteric community.
73,
Brian K6LPM
Brian
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