[Moon-Net] metric bolts for RAK
donhawbaker at outlook.com
Sun Apr 4 23:15:12 CEST 2021
My SPID has nuts welded onto the pipe. It’s an RAS. Different model. You have to be careful. I have stripped the threads on at least one of the nuts. Someday I will cut it off and weld on a new nut.
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From: Edward R Cole via Moon-net<mailto:moon-net at mailman.pe1itr.com>
Sent: Sunday, April 4, 2021 4:50 PM
To: Andrzej Hoffmann<mailto:sp2fry at gmail.com>
Cc: ak-vhf at mailman.qth.net<mailto:ak-vhf at mailman.qth.net>; moon-net at mailman.pe1itr.com<mailto:moon-net at mailman.pe1itr.com>
Subject: Re: [Moon-Net] metric bolts for RAK
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.
At 02:37 PM 3/31/2021, Andrzej Hoffmann wrote:
>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.
73, Ed - KL7UW
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