Engine design

[ATinkerer]

neat tool.

Gordon

[salt-racer]

It really blows my mind seeing early technology like this. I had never seen or heard of this type of tool with it's unique orbiting stone, very cool. Everything 'old' is 'new' again! I'm waiting to see it in action at John's shop.
George

[Lotus54]

What is the advantage of using an orbital cut?
Perhaps the early stones would get too hot?

I've been (sort of) looking for an old hand cutter that does the top and bottom of the seat. The one that narrows the seat and sets the height. I learned on one of those and still like them.

I picked up many years ago an old Alemite dynamic spin balancer for wheels. The 'on the car' type.
It takes a bit, but spins it 120mph + and does a great job if you know how to use it.
It has tubes in it!

[John H]

The Hall-Toledo seat grinder can be set to grind as little as .0005 per setting which eliminates chatter or excess cuts.
They were quite popular with aircraft engine builders back in the day.
I have a Neway hand seat cutter set I can help you with, depending on size of your valve guide.

[Lotus54]

With at little per cut I can certainly the advantage. Especially for an engine that will be rebuilt many times.

[John H]

Is this the type of valve seat cutter you are referring to Mark?

NEWAY.JPG

[Lotus54]

No, that is a lot nicer.
The one I was thinking of only cut the top and bottom angles, that looks like it will cut seat also?

[John H]

This set will cut 30º, 45º and 60º. The inserts are serrated carbide cutters. The first cut (45º) would be the valve seat angle. The 30º and 60º cuts would determine the width and point of seat contact with the valve. The dark area is .050 wide.

valve seat.jpg