At 22 October 2005, 12:46 PM, Daniel wrote:
We don't machine parts. We are an assembly shop . We also do panel
layouts and wiring. If we need something smaller then 1 mm
accuracy, then we have someone else do it. We still work off some
drawings and designs from the '50s thru the '70s. As I said the
drawings are in fractions with 1/32 tolerances.
You are the one who frequently makes unqualified statements like
"Products converted from fractional inches can easily within standard
fractional tolerance ranges be converted to whole millimetres without
any loss of precision."
When you start appropriately qualifying your claims, based on
real-life experience and knowledge, then I won't have the
entertainment of correcting your foolish statements.
Some of the machine shops that we had parts done for us must not be
that religious about following tolerances as you insist. Many times
precision parts came back to us wrong. Yes, all these modern
machines can do wonders, but you need to visit a real machine shop
and see most are not 21-st century.
LOL - wanna bet that I've been in far more machine shops than you?
I just wonder how much a machine like in the PDF would cost and how
many Ma and Pa machine shops could afford to own just one.
Why don't you call Giddings & Lewis and find out?
The fact is that a competent machinist on a properly-maintained
50-year-old Bridgeport knee mill can regularly achieve precisions in
the 0.05 mm (0.002") range. The newer machines allow better accuracy
and certainly more automation, but they are hardly required to reach
accuracies far beyond what you apparently ever use.
Not all of us may work in be 21-st century companies like QSI, but
we did have a very profitable year so far. Can we say the same for QSI?
And who do you work for?
Jim Elwell
Jim Elwell, CAMS
Electrical Engineer
Industrial manufacturing manager
Salt Lake City, Utah, USA
www.qsicorp.com
