"Dave Hinz" wrote in message
...
On Tue, 05 Jul 2005 13:16:04 -0500, Rex B wrote:
Get the two marked with a sharp punch, then use a compass to scribe the
other two.

I thought of that...right after I drilled & tapped the first two holes.

While I have no further insight into your hole circle problem, I have a
suggestion.

You should consider writting out work plans for your projects, before you
begin them. While this sounds like a waste of time and a lot of work, I
gaurentee you'll have to think about all the processes in the work plan
while you're at the machine (whether you've done a work plan or not).

The bolt-hole circle is a good example of why work plans are a good idea.
You've probably painted yourself into a corner from which you will not
easily emerge (at least with the original piece of material).

At work I see this a lot, although simple mistakes like yours could quickly
cost tens of thousands of dollars to repair as well as threatening the
safety of people on the floor.

Just my $0.02 worth...

Regards,

Robin