Re: Stack of 7-10 plates
- From: "Harold and Susan Vordos" <vordos@xxxxxxx>
- Date: Thu, 31 Aug 2006 03:30:41 GMT
"Bill Schwab" <bschwab@xxxxxxxxxxxxx> wrote in message
news:SzrJg.792$v%4.498@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello all,
I think I know what you are going to say, but just in case, here goes.
I need to make a "large run" of mounting plates - for me that means more
than five :) These will be 0.065" Al, about 6.5x11 in with four or five
sets of related holes. This sounds like a great opportunity to clamp a
stack on my mill, with one catch: several of the holes require some
counter sinking. The design is more set than it sounds. I have one
working prototype, but plan to add some hole sets on the theory that
they will end up being useful.
Would you stack, clean up the edges, drill the holes (they need to be
reasonably precise, at least relatively in the different groups), and
then separately do the counter sinking on a drill press? Next up would
to be position stops to allow me to individually re-clamp the plates to
sink each plate on the mill. The only other alterative that I see is to
make the plates separately; I enjoy milling, but have better things to
do, unless that is really the only viable choice.
Recommendations?
Thanks!
Bill
If you get serious about making parts, one of the investments you should
make is a micro-stop for countersinks. They control size very well, and
don't need precision locating, due to the use of a pilot. They can be used
in an inexpensive drill press with excellent results. You can stack drill
your parts, then go back with a second operation and do the countersinks.
You can do the same thing by establishing some simple stops on your mill
table, then countersink the same holes in each plate by going to proper
location. You need not clamp the parts, just bank them well against the two
stops. This setup requires that your parts are all drilled accurately from
common datum points----so try to make your plates identical in size, and
insure that they all locate properly when you make your setup. By
countersinking this way, you can set a spindle stop to control the diameter
(or depth) or the countersink.
Regards part size, I've always made it a practice to hold dimensions
closely, and the parts square. That way you can bank from opposite edges
when necessary, and still hold tight tolerances in hole spacing when all the
holes aren't drilled in the same setup. .
Harold
.
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- From: Bill Schwab
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