Mathey Dearman Pro Model Torch Arm - Manual (Page 2)

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The Pro Model Torch Arm with Out-Of-Round feature is design for use
with the Saddle Machine to compensate for oversize, undersize or out-of-
round pipe. The Torch Arm permits the torch to be precisely adjusted
horizontally and vertically by means of Racking Knobs. The Pro Model
moves the torch radially to minimize notching of the pipe as it crosses
the pipe weld seam or surface imperfection.