![]() ![]() Gussets must be installed at all main intersections on the main cage including diagonal and rear down braces, and where single weld fractures can affect driver’s safety. Maximum opening size in this area is limited to 370 square inches.Īll roll cage bars must be at least 3†in any direction from the driver and co-driver’s helmets while they are in their normal driving positions. Tubes must be placed in such a manner as to limit openings adjacent to the occupants. Additional side tubes may be required to limit cockpit intrusion, these additional tubes must be of the same size tubing as the roll cage. The sidebars must be formed of tubing of the same material and dimensions as the roll cage itself and must be securely attached to the cage’s front and rear members. These bars must be parallel to the ground (or as close to parallel as is practical) and be located vertically in relation to the occupants to provide maximum protection without causing undue difficulty in entering or exiting the vehicle. Centerlines of all required tubes must converge at intersections.Īny vehicle that is not provided with stock steel doors for its driver and co-driver must be equipped with sidebars, at least one on each side that will protect the occupants from the side. If front and/or rear hoop terminate at elbow/door bar, lower A-pillar and/or B-pillar must be made of same tubing size as roll cage. (6) Lower A-pillar tubes, and lower B-pillar tubes Roll Cage DesignĪll roll cages must be constructed with at least one (1) front hoop (top of cage to floor), one (1) rear hoop(top of cage to floor), two (2) interconnecting top bars, two (2) rear down braces and one (1) diagonal brace and necessary gussets, see Figure 1. Minimum material dimension requirements for roll cages apply to the following members of the roll cage: Roll cage terminal ends must be located to a frame or body structure that will support maximum impact and not shear. Where bolt and nuts are used the bolts shall be at least. Cab or body mounted cages must not be attached to the body structure by direct welding, but must be bolted through and attached by the use of doubler plates (one on either side) with a minimum thickness of. It must be emphasized that the use of heat-treated or high carbon steels may cause problems and that bad fabrication may result in a decrease in strength (caused by brittle heat-affected zones), inadequate ductility and internal stress.Ĭages must be securely mounted to the frame or body and gussetted and braced at all points of intersection. The center radius of the bends may not be less than three (3) times the outside diameter of the roll cage tubing. None of the tubing may show any signs of crimping or wall failure. Good external appearance of a weld does not necessarily guarantee its quality, poor looking welds are never a sign of good workmanship. ![]() No oxy-acetylene brazing or welding allowed. It is strongly recommended that the welder inspect all welds using Magnafluxâ„¢, die-penitent, or other effective methods.Īll tubes must be welded 360-degrees around the circumference of the tube. ![]() ![]() All welds shall conform to the American Welding Society D1.1, Structural Welding Code, Chapter 10, Tubular Structures and Standards for the material used (see AWS. All welding must be of the highest quality with full penetration and no undercutting of the parent metal. Material for roll cage construction must be 4130 chromoly tubing or ASTM 1018/1026 CDS/DOM. ![]()
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