Patent ID: 8635888
Filing Date: 2014-01-28
Classification: C03B

Abstract:
1. A method for depositing silica particles on a workpiece, comprising: (a) depositing the particles onto the workpiece with a burner; (b) holding the workpiece with a lathe; (c) translating the workpiece at a rate greater than about 1.5 meters per minute and rotating the workpiece at a speed greater than about 60 revolutions per minute relative to the burner; and (d) controlling the translating relative to the burner according to a motion profile comprising a first end and a second end, wherein a velocity represented at the first end of the motion profile is 0, the velocity increases at a constant acceleration to a maximum velocity at a first point on the profile proximate the first end and between the first and second ends, the velocity is constant from the first point to a second point proximate the second end, and the velocity decreases at a constant deceleration between the second point and the second end to a velocity of 0 at the second end of the motion profile, wherein the absolute magnitude of the constant acceleration is substantially equal to the absolute magnitude of the constant deceleration.