Cutting/grinding valves on a lathe

[Bryan_Cotton]

I may be slightly out of control on the tool buying lately.

[Bryan_Cotton]

@gammaxy

Watching the video, from both the way the grinder is removing material and visible motion of the valve as it rotates, it appears there is a noticeable amount of runout.

I spent some quality time with my new mag base and dial indicator. I can get the valve stem runout as low as 0.002-0.003”, but the runout at the edge of the face is more like 0.010”. I’m debating giving it another go as is - the runout on the face will be better than it is now.

[173CP]

I have a jabiru 3300 and had to grind the valves. Not being a machinist or a mechanic I took the heads to an old motorcycle shop. His machine fit the heads perfectly as they are the same as a 550 motorcycle head.

[Bryan_Cotton]

I used my setup to do the 30 degree back cut on the new valves.