I just returned from my shop. Took two 1-2-3 blocks and put them in my mill
vise. Used a 1.25" wide parallel to hold them apart. The I used a
telescoping gage to measure the distance by first compressing the gage. Then
I set it at about a 10° angle and snuged the gage up. I then held one end of
the gage so it could not slide around and moved the other end in an arc. Arc
path is not important because we are dealing with a uniform gap between
The gage compressed to the distance between surfaces and then fell out. A
trial fit of the gage in this distance showed me it was a snug fit.
Behalf Of Mario
Sent: Saturday, June 29, 2013 9:16 PM
Subject: [mill_drill] (unknown)
2d. Re: Telescoping gage per "Der Meister"
Posted by: "Rick Sparber" rgsparber@...
Date: Fri Jun 28, 2013 10:23 am ((PDT))
Say you have two parallel surfaces. You set the telescoping gage so it is
slightly longer than the distance between the surface. The gage is lightly
snug so it can be compressed. Holding one end steady against the first
surface, you swing the other end to the opposite surface. It will make
contact and start to compress. When it reaches the distance between
surfaces, it will stop compressing. From then on, the gage will just fall
out unless it is exactly perpendicular to the surface.
So it seems to me that it would be easier as the diameter increases.
By the way, I retracted the article because my theory about deviation from
the diameter line was wrong.
Yes, so it would seem... but just imagine, as the gage start to
compress because of the friction at the "free end" what keeps the
"stationary end" from reacting (and moving) in the opposite direction?....
and that is assuming everything is happening in ONE plane!?!?
Please don't take this as a challenge to your theory. I am only
pointing out that sometimes the "real world" get's a little more
complicated, and maybe Günther has experienced these 'real world
complications' more than some of us amateurs.
By the way, I could not agree more with your questioning the old world
authoritative, autocratic approach to teaching.... I agree that encouraging
learning is far mor productive than demanding it!
Whenever someone insists they are NOT an expert (meister), I tend to
listen. It is the ones who insist they ARE an expert that I tend to
question. The title is not always reflective of the insight.
When I was a young engineer, a few years out of college, I found
myself, on second shift, on the shop floor of one of the largest, most
modern machine shops in the world. We were building the detail parts for the
first F-15. I was called down to one of the layout tables because the lead
machinist was about to machine the first F-15 centerline pylon fitting, and
had some questions about the blueprint (yes, I said BLUEPRINT!) This was a
part that would have taken a full week to machine on a modern 5 axis
machining center (not to mention the months of programming time), that was
so complex that the designer felt compelled to put a tri-metric view of the
part just above the title block so people would have an idea of what this
part should look like!
When I got to the layout table I saw, sitting on this 3ft. x 6 ft.
granite surface plate, a 6 page J size blueprint and a 12" x 16" x 28" hand
forged titanium billet, painted blue with Dykem with a bunch of scribe lines
on it, and a Brown & Sharpe height gage.
I was introduced to a wonderful gentleman who had been thru the
apprentice program, spent his time as a journeyman and then spent more time
than I had been on this earth, as an "all around machinist" laying out and
machining complex machined parts..... and he was going to ask ME some
questions about how to interpret the drawing, because I was "The Engineer"
Fortunately, I immediately realized that he was a heck of a lot
smarter than I was, so together, over the next several weeks, we got that
part made. And while I did answer a few of his questions, I learned a hell
of a lot more from him than he did from me!!!
As Rick says, "all of us is are lot smarter than any one of us" !!!