My New Ball Turner Won't Turn Balls

[snub]

They look like an onion, or the roof of the Taj Mahal. I built this after looking at the one that Repton sells. Perhaps there is a design flaw?

[mexican jon]

It looks to me as though you haven't set the distant correctly  See attached 

[Will_D]

The tool tip has to be dead on centre height. If not it turns a conic shape.

That's how you machine aeroplane propeller spinners.

HTH Will

[mexican jon]

That's how you machine aeroplane propeller spinners.HTH Will

That's what I love about this site  You learn something new everyday 

[Joules]

That would be the Taj Ma Quadcopter then....

[snub]

Hmmmmm...the center height appears to be spot on. I'm wondering if maybe the cutting tip is not in the same plane as the pivot, if that would cause this. I will fiddle with it some more.

[Pete.]

It's simple, the radius you set your tool to swing at has to be the radius of the bar you're cutting. You're tool swing radius is greater.