On Mon, 30 Jul 2018 17:35:42 -0400, "Jim Wilkins"
wrote:

"Larry Jaques" wrote in message
.. .
On Thu, 26 Jul 2018 08:35:24 -0400, "Jim Wilkins"
wrote:

"Larry Jaques" wrote in message
...
On Tue, 24 Jul 2018 16:46:23 -0400, "Jim Wilkins"
wrote:


This shows the machine but I didn't find a photo of the center
grinding attachment
http://vintagemachinery.org/pubs/1141/1691.pdf

Why are both guys on the Specs page cutting diagonals? They both
have
a hand on the X and Y axis handles. (Marketing never learns.)

I do that too. The design gives up some rigidity for versatility,
like
a Shopsmith, and tends to develop a visible vibration pattern which
slight zig-zag motion breaks up. The manual suggests that 25
microinches is the best finish you can expect.

So you rest the other hand on the handle to stabilize it? Aren't the
gibs lockable?


The zig-zag consists of a slow continuous feed in or outward with the
left hand's leadscrew while moving the table back and forth with the
right hand's fast rack and pinion feed. It isn't the best way to grind
to a precise dimension but it breaks up the wheel's vibration
resonance and I normally just use the machine to grind below the dings
and rust pits on a block of sheared or flame-cut scrap steel and make
two sides parallel or all of them square enough to clamp before
milling it. The mill vise needs two flat and parallel sides to hold
work securely, the grinder needs only one to start and can grind the
others square or parallel.

Grok that. Thanks.


The better way is to feed in almost the width of the grinding wheel
between passes, to equalize wear across it. I do that for a while
after dressing the wheel until some narrow workpiece job like
sharpening end mills wears it unevenly.

Yes, I see the wisdom in that. Thanks for the Grinders 101. I've
obviously never used one.


Like the rest of my 50's/60's machinery it's better for a small shop
making experimental and prototype one-offs than a high production
environment. I'm far too inefficient to be a job shop. I tend to
redesign the part as I make it.

That's often a good thing when you work for yourself, but
not for others.

Designing and prototyping the packaging was an extra service I could
offer to electrical engineers with minimal mechanical training or
experience. Packaging is very important for microwave circuits. That
largely means sealing your signals in and other signals out.

I'll bet that paid well, in addition to being interesting and fun for
you.


When I worked for others they had the proper shop. I've run CNC and
manual Bridgeports and 15" lathes etc and designed sheetmetal to be
fabricated on 10' vertical press brakes and Strippits. I just don't
have the space or need at home for larger machines.

Understandable.

--
America rose from abnormal origins. The nation didn't grow organ-
ically or gradually from indigenous tribes--like, say, the French
or the Poles--but emerged out of courageous, conscious acts of
will by Pilgrims and Patriots. --Michael Medved, Right Turns