MATRIX 6900 BALL THREAD GRINDERS
THESE MACHINES ARE MODEL 6900's
AGE IS ABOUT 1987-88
THEY HAVE BEEN GRINDING THE BALL THREAD ON PISTONS FOR THE STEERING GEAR. THE THREAD WAS A 1.0" PITCH DIAMETER BALL SCREW 5/16" DIA . WITH THREE LEAD VARIATIONS. THERE IS A 0.550", 0.600" AND A 0.650" LEAD THAT WE RAN. THE MACHINES WERE TAKEN OUT OF SERVICE DUE TO A CHANGE IN THE PROCESS OF THE PART. THEY WERE RUNNING ACCEPTABLE PARTS TO SPC QUALIFICATION.

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