Lathe and concave/bal lturning

[John S]

This is known as the Steve BEDair design from the original maker ? although that's probably lost in time.
I dare say if you rear a 1900's engineering book you will see similar.
The point is many have made this and it seems a lot of work and setup, removing compound etc to do a ball.

Look at these setups



Simple cheap boring head fitted to a parallel shank that runs in some form of holder that fits the toolpost. easy to fit and use and accurate in setting.

Another type is the swing type, this is one sold by Arceurotrade for the mini lathe but this one had a simple bracket to allow it to fit many different lathes.



Possibly more limited in use but even simpler to make and use.

I have one that fits my CVA toolroom lathe, a lot like the Bedair design but micro feed, hight adjustment, BBC2 and satellite. Used it once, took ages to setup and it's now in the back of the cupboard.

For 90% of mu work i use the ARC one, the other 10% is done on the CNC.