Rich,
Try Harbor Freight - 25,000 RPM grinder.
http://www.harborfreight.com/14-in-43-amp-heavy-duty-long-shaft-die-grinder-60656.html
or
http://www.harborfreight.com/electric-die-grinder-with-long-shaft-44141.html
Seems they have two SKU's for this grinder???
I borrowed one from Bud, N7CW and I was able to elongate my holes very
easily. I forget what grinding tool I used, but with the right tool, 8
holes took less that 15 minutes.
Instead of purchasing one, you might call Home Depot and see if they rent
them.
GL,
Ray,
N6VR
On Mon, Sep 7, 2015 at 12:50 PM, <john@kk9a.com> wrote:
> 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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