Hi Don

Thanks for telling me I’m over thinking this thread. Unfortunately I do that I lot nowadays.

I looked around and I don’t know what a thumbnail sketch is.
You site a TP page two, so I will have to google that one.
I looked at both thumbs on my hands and didn’t see any sketches on them either. 🥴

I looked back into the site you placed and as my wife says, I have a big problem with not scrolling up or down.
I don’t know why I cannot get it my head that there’s more is just below the bottom of the screen out of sight. Sometimes it’s just a half inch.
I guess I’m not as easily enticed to do better as it pays far less @ 73.

After taking a scroll … I saw that it said “show more.”
Now it explains why I was having so much of a problem with the revisions numbers missing let alone the P and the J’s being on one illustration.
Must have been a transition production over a few years?
What is on that site though shows me that yes, they had lots of engineering changes as I suspected.

As I remember you said you worked in a parts stores a few years back.
I bet you have that scrolling and thumbing pages down as a normal working habit.

Back when I middle aged I was led to or forced to workout on one CNC lathe we had.
Back Then, you had to advance through program lines to move a tool offset.
No separate tool numbering page. Tool indexing with Only X & Z.
It was a line by line display and only red led characters. Plus a limited numbers in length.
You learned quickly to pay attention to decimal point location.
There were no monitor screens back in those seventies.

When I became an instructor I ordered two trainer machines.
A tiny CNC bench top lathe with a mono chrome screen but the knee type milling machine with a new color monitor.
Luckily, I ordered It with “dry run” tool path technology. It was better than most companies had in those times.
This was the mid to late eighties.

Even with students learning on wax test blocks, you still had to watch out for clamp locations.
It sure helped to stop running over of hold down clamps from lacking a Z code program input.
A CNC machine runs all movement codes of a line simultaneously or so fast across the lines it seems too.
There are feed rate codes and rapid rate codes.

Devil in the details of assemblies too.

Thanks again for helping to straighten me out.
Now, I will have to go under three cars and find some conclusive serial numbers.

Phil