[Moon-Net] metric bolts for RAK

Martin Flynn maflynn at theflynn.org
Mon Apr 5 00:10:33 CEST 2021


https://www.boltdepot.com/Metric_socket_screws.aspx


On 4/4/2021 4:37 PM, Edward R Cole via Moon-net wrote:
> Well we got as windy day, today.  Only been a week since I discovered 
> the Alpha-SPID set screws loose and tightened all eight of them.
>
> My 6m-eme array is free-rotating in the wind.  Apparently the set 
> bolts loosened up in only a few hours of wind, and the remains of the 
> shear bolt has fully sheared off.  And all because the mfr was too 
> cheap to supply stop-nuts (or lock-nuts) to keep the set bolts tight.  
> I actually tried adding a stop nut but that left too little thread to 
> tighten the set bolts (nut needs to be thinner or bolt longer).
>
> So either try to find longer metric bolts in America or quit and smash 
> everything to H and take up stamp collecting.
>
> Was considering trying eme with the new array pretty soon, but it will 
> cost me another $233 to rent a man-lift just to tighten the bolts 
> (again).
> Well, I will use a 1/2-inch shear bolt this time (equivalent diam to 
> 10mm).
>
> I did test the RAK and its rotating ((evidenced by the change in 
> direction on the indicator) so apparently not a gear failure -just not 
> attached to the antenna.
> Hopefully array will not over-rotate and destroy coax lines in the 
> process.
>
> 73, Ed
>
> At 02:37 PM 3/31/2021, Andrzej Hoffmann wrote:
>
>> Hi Ed.
>>
>> If you have a problem with the metric screws I can send you some. 
>> Write down the length of the bolt you need. The original ones are 
>> probably 25 mm. As far as I know, they are M10 threaded screws.
>>
>> Vy 73
>>
>> Andrzej SP2FRY
>
> 73, Ed - KL7UW
>  http://www.kl7uw.com
> Dubus-NA Business mail:
>  dubususa at gmail.com
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