[Moon-Net] metric bolts for RAK
maflynn at theflynn.org
Mon Apr 5 00:10:33 CEST 2021
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
> Well, I will use a 1/2-inch shear bolt this time (equivalent diam to
> 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
> 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
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