Turn A Perfect Wood Sphere Or Ball - No Expensive Jig

One project during a week long woodturning class a few years ago was a wood ball using a jamb chuck. I failed miserably to get the ball smooth. It ended up very rough and out of round. With this failure, I feared being able to make a good ball. Since then, I’ve looked for a jig or a process to turn a perfect ball or sphere. I doubted I could do it myself. I looked at commercial jigs - expensive and plans for DIY jigs - difficult to make and potentially inaccurate. More recently, I