![]() The dies should fit securely onto the machined register on the bend head, and must always be properly fastened down. Dies are manufactured from various grades of steel depending on the type of application. ![]() ![]() AddisonMckee Tube Bending Guide FAULT FINDER: BALL MANDREL SELECTION CHART FITTING A WIPER DIE Markings on tube centreline: Bend Die.Clamp.Die Pressure.Die Mandrels.Wiper Dies.Hump at the end of a bend.Deep scratches in bend/Wiper Die Area.Tool marks on tube in clamp area.Wrinkling in bend area.Tube breakage in bending.Tube collapses either with or without wrinkling through full bend.Wrinkles on bend with all tools in correct position.Excessive springback occurs when the selected dies do not meet the tube's OD (outside diameter) and CLR (centre line radius) requirements.
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