The easiest way to elongate the holes is with an end mill in a milling
machine but since that is not an option that you wish to use, a 1/4 shank
carbide burr in a die grinder works pretty well. Of course wear eye
protection and watch for slivers.
John KK9A
To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: [TowerTalk] Grinding hole in thick steel plate?
From: Rich Hallman - N7TR <rich@n7tr.com>
Date: Mon, 7 Sep 2015 18:33:22 +0000
I had a ¾ inch steel plate made up that will be used to retrofit a HDX589
base
foundation to a HDX572 base. After giving both bases to the machine shop
and
asking them to make sure all of the holes are exactly the same location as
the
base, some of the holes are 1/8 to ¼ inch off. I had a major issue with
this
machine shop so I will not take it back for now.
I wanted to see what others have done to grind out holes in thick steel
plate.
I was looking at the Carbide Burr bits and getting a ¾ inch burr bit to see
if
that would grid enough from the hole so it would then fit the bases.
The holes are pretty close....so I thought grinding them out would be the
best
solution for now.
Any thoughts?
Thanks....Rich
Rich N7TR
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