Date: Sun, 24 Apr 2016 20:05:13 -0700
From: Grant Saviers <grants2@pacbell.net>
To: Les Kalmus <w2lk@bk-lk.com>, TOWERTALK@contesting.com
Subject: Re: [TowerTalk] [Bulk] Lifting a mast off the rotator
Les,
On a used 2800 I acquired the prior owner had secured a cut off box end
wrench on the center bolt with a screw through the wrench handle and
threaded into the Orion plate about 2" out from the bolt, oriented so
the split mast clamp clears the wrench. Now I know why he did that.
Grant KZ1W
## slick idea, but it wont work if the optional m2 self centering 1/2 inch
thick,
triangular chunk of AL is used. When the self centering device is use, a really
long 1/4-20 SS bolt is provided.... to get from top of self centering
block....
all the way through the block, then to the threads in the steel base plate.
## I have 2 of the OR-2800 rotors.... and the self centering block is only
required
if a 2 inch mast is used. And even then, its really not required with a 2
inch mast.
## The self centering block is pyramid shaped, and the entire block fits
inside a
2 inch mast. Dunno if it will still fit inside a 2 inch mast, that has a .375
wall thickness.
## If a 2 inch mast used, the clamp would normally be adjusted so its just a
bit bigger
than 2 inch. If 2 x thrust bearings are used, the self centering device is
def not required.
## I would not use it. Instead use the shorter 1/4-20 bolt.... but use
some blue loctite
on the threads. Purple locite is slightly weaker than blue loctite..and will
also work. Or at
least use a SS split ring lockwasher on top of a SS fllatwasher, below the
bolt head.
## the scissor jack is a good idea. The simple bottle jacks will also
work, but have a limited
amount of vertical lift distance. Cheap, and available from 1/2 to 20 ton.
The issue with bottle jacks is:
you can precisely control the lifting function..... but when u go to let it
down, it comes down quickly.
Jim VE7RF
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