Drilling holes in the TT's frame question
I am going to be drilling some 1/2" diameter holes in my trailer frame ,(the I beam) for some eye bolts for hurricane tie downs. My question for any one that has done this or drilled through any ste...
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Actually I am an aviation airframe mech To drill hard steel frames, Us a 5/16 pilot followed by step drills moving up 1/4 at a time. When You finish the hole, use a larger bit to round off or chamfer (deburr) the edges of the hole thus preventing stress cracking. Use hard grade 8 bolts and torque to the proper torque and flat washers to prevent stress on each side of the hole.
