[TowerTalk] [Bulk] Lifting a mast off the rotator
Bob K6UJ
k6uj at pacbell.net
Mon Apr 25 11:58:08 EDT 2016
Grant,
Thanks for the video on Nord-Lock.
I am impressed with the product. I was surprised that the lock nut option
didn't secure better in the tests. I always thought this was the most
secure method.
You learn something new everyday !
This topic is very timely for me. I am getting ready to install an
Orion 2800 myself.
73,
Bob
K6UJ
On 4/25/16 7:41 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 at pacbell.net>
>> To: Les Kalmus <w2lk at bk-lk.com>, TOWERTALK at 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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