[TowerTalk] Brackets for Mounting Thrush Bearing and Rotor

[Roger (K8RI) on TT]

On 8/16/2014 9:33 PM, John Pierce wrote:
> I am trying to find reasonably priced Brackets for a Yaesu Thrust bearing
> and for an old  CD 44 Rotor.  I want to mount them to a 4"X4" post.   Any
> Ideas?

The simplest for the rotator mount would be a piece of pipe The old 
CD-44 I had a mast clamp on the bottom.  You removed it to mount the 
rotator on an accessory plate.  The early rotators of this type all came 
with the mast clamp on the bottom. I don't know when it was changed to 
an accessory.  In the early days (over 50 years ago) I dad several small 
tribanders and monobanders (3L) mounted on 20 or 30 foot steel masts.

The thrust bearing could be mounted on a steel plate at the top of the 
post.  Mark out the bolt circle for mounting the bearing and use the 
same center point for the center drill in a hole saw for the mast pass 
through hole. I'd use a piece of at least 2 or 3" angle iron/steel X 
1/8th in thick...or what ever is handt Mount the angles on opposite 
sides using a couple of through bolts. Mount the bearing plate to the 
angle with two bolts each. Use bolts and nuts, or thread the angle for 
the plate screws.  Alignment is not critical, but should be close 
assuming you use 8 or 10 feet of mast between the rotator and bearing. 
Don't forget the bearing and rotator need to be mounted far enough to 
the side to clear the post.

It helps to have access to a drill press and some "C" clamps rather than 
doing this with a hand held drill, but it can be done with only simple 
tools.  How you mount the rotator and bearing is open to a wide 
variation.  I'd use through bolts as the most secure. Threaded rod with 
nuts and washers would also work.  I'm assuming this will be a rather 
short mast and small antenna.

Be careful with power tools and watch out for sharp edges and "burrs"

73 and good luck,

Roger (K8RI)

  John AD2F

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