Also included on our production staff is the vacuum forming department. Forming glass over a mandrel in a vacuum defines our method. Using our proprietary process, inside diameters can be formed to very tight tolerances within +/-.0001". Tapers, flats, multiple diameters etc. can be included with the mandrel for an array of inside diameter profiles. Depending on the diameter, straightness can also be controlled here. When the inside diameter is small (<.060"), the bore can be inside diameter straightened. This can be achieved by inserting a wire under tension through the bore, then applying heat to the tube. Tubes can also be straightened from the outside diameter on a set of rollers while applying heat.
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