Stupid question about valve play

[Tapio]

Great pics!

How the rounded surface is ground on the bottom of lifter in my pic above, I don’t know, but what puzzles me is how the flat bottom surface of the EF is done. The only cutting machine that leaves straight machining marks that I can think of is a shaper:
http://en.wikipedia.org/wiki/Shaper

But shapers are sooo obsolete. It takes forever to cut a flat surface on one of those, as compared to a milling machine.
And that’s why they haven’t been around for the last 50 years, or so.

[Corvus]

Great pics!

How the rounded surface is ground on the bottom of lifter in my pic above, I don’t know, but what puzzles me is how the flat bottom surface of the EF is done. The only cutting machine that leaves straight machining marks that I can think of is a shaper:
http://en.wikipedia.org/wiki/Shaper

But shapers are sooo obsolete. It takes forever to cut a flat surface on one of those, as compared to a milling machine.
And that’s why they haven’t been around for the last 50 years, or so.

I remember the shaping machines from college, back in 1976. Great fun! Especially when you took a deep pass and the workpiece came flying out.

Can't see the EF being done that way? Could the marks be grinding marks?

[Bruno]

Surface grinder.

Mark