Re: [CAD_CAM_EDM_DRO] Re: Machining Ferrite Alumina Ceramic Sapphire Quartz Silicon Nitrid

Hi Bill
 No , we tried to centerless grind these but they are Ferrite and TOO fragile and the grade of material didn't come in anything smaller than 1/4" . After many hair raising weeks we came up with a methiod that gave about a 20% yield that eventually was refined to about 95% yield.
  You might understand this but I don't know how many others on this list will , we used a "Spin Jig" to rotate the part like a lathe but more precision bearings then attached a DC motor and a Variac powersupply to dial in the desired RPM then this was mounted on a surface grinder with adjustable spindle RPM for the diamond wheel and we built a CNC controller with Geckodrives and a laptop computer for precision feed rate.
  All in all it is a bit like turning a part on a lathe , the basics of this was an idea given to me by an OLD machinist at NASA in 1970 when I was a student there.

Ron