Knowledge You Can Build On — Est. 1998
Vacuum Eccentric Sphere Chuck
Dave Delo
Just wondered if anyone has built a vacuum eccentric sphere chuck to the plans David Reed Smith has on his website? He doesn't sell them so wanted to find out how anyone that has copied it felt about its performance. I have a method that works but this idea looks like it should work pretty slick but just looking for some input. www.davidreedsmith.com/Articles/SlidingEccentricSphereChuck/SlidingEccentricSphereChuck.htm
Re: Vacuum Eccentric Sphere Chuck
david delo
Let's try this
http://www.davidreedsmith.com/Articles/SlidingEccentricSphereChuck/SlidingEccentricSphereChuck.htm
Re: Vacuum Eccentric Sphere Chuck
John C Lucas
I havent built the vacuum chuck but i do a fair amount of eccentric turning using the 2 jaw method. It works great. Small objects held with a vacuum chuck often have a problem with not enough holding power due to the la k of square inches. His chuck gets around this buy being concave and partly supporting tbe sphere so not as much force is needed. Ive used tbe rubber hose in the morse taper method to get the vacuum to the chuck and it works great. Ive kniwn david quite a while and he doesnt do things half ass so i would trust bis work
Re: Vacuum Eccentric Sphere Chuck
david delo
I've done a few offsets between centers and like how they have come out but would like to add some other embellishments in a different direction. I've used a 3" vacuum cup to turn off the headstock tenon without any problems on 3.5" to 4" spheres......but they weren't spinning eccentrically either. 
