Hi Rich, be prepared to spend an hour or two per hole as it is a slow
process. I had to enlarge a three inch diameter hole in a 3/8" thick bearing
plate about .125" last year and it seems it took three or four hours to do
that.
If you live in or near a large city, you might find a company that does cnc
flame or plasma cutting. The precision that can be achieved is amazing and
the cost is dirt cheap (at least here in the Dallas area it is). Perhaps
they can rework your base.
I can purchase flame cut pieces from them for little more than the raw
material cost from a steel supplier.
Watch out for the metal slivers from the burr. They are like millions of
tiny needles.
73,
Gerald K5GW
In a message dated 9/7/2015 1:33:46 P.M. Central Daylight Time,
rich@n7tr.com writes:
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
ex KI3V, N3AMK, WB3JOV
www.n7tr.com<http://www.n7tr.com>
http://www.qrz.com/db/N7TR
Telnet: dxc.n7tr.com N7TR DXCluster
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