Very interesting Grant. Thanks.
The 1/4" bolt sits on a split lock washer on top of a 1/2 tall spacer
which rests on the drive plate. The centering block is a later style
that has a recess that sits over the 1/4" bolt.
Do you think the Nord lock will work on this spacer? The spacer is free
to rotate with vibration and I think it's bound to come loose again.
Or... a Nord lock above and one below the spacer? Where can I buy just a
few SS 1/4" Nord locks?
Of course, the other option is to not use the centering block but it
makes getting things in alignment very easy.
Les W2LK
On 4/25/2016 10:41 AM, Grant Saviers wrote:
The used OR-2800 was driving a 3" mast, but I have one driving a 2"
without a centering block w/o problems (so far) but a bigger load is
going onto the 2" mast shortly.
Medium strength Loctite is a good idea if the internal threads can be
degreased. Instead of a split ring washer, I use Nord-Locks for
critical fasteners. Check out their video re locking fastener tests.
http://cdn.nord-lock.com/wp-content/uploads/2015/12/Nord-Lock-Junker-test-HD_1280x720.mp4
Grant KZ1W
On 4/24/2016 21:00 PM, Jim Thomson wrote:
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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