[TowerTalk] [Bulk] Lifting a mast off the rotator

[Les Kalmus]

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 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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