I have 4 Prosistel rotators in use and all masts slipped whatever I torqued
the screws.
So I decided to drill through the masts and used fitting bolts to fix that.
I used an electrical hand drill with tungsten-carbide drills and drilled
while on the tower.
Masts are not cromoly but S355J2+N steel and drilling was done much easier
then expected.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
john@kk9a.com
Sent: Mittwoch, 29. Juli 2020 14:55
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Mast slippage
Unfortunately there are a lot of poor quality tools being sold to
consumers, I do not know what kind of steel they are mode out of. I
bought a metric tap once at Northern Tool and it twisted up on the
first hole. Heat treated high speed steel tools will not twist with a
hand tapping wrench. If you really want quality drills go to the
industrial sites like MSC Direct. HSS drills should be fine for most
steels. If you buy carbide tipped drills make sure that they are for
drilling steel and not concrete, which has a different point style. Be
careful not to jam the bit and break the carbide point.
John KK9A
K9MA wrote:
After recently ruining several drill bits trying to drill through a cast
iron fence post, I discovered there are carbide tipped bits for drilling
metal. I haven't tried them on anything, let alone cro-moly, but they
might work.
73,
Scott K9MA
--
Scott K9MA
k9ma at sdellington.us
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