Thread: Fabrication 101
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Old 02-10-2013, 02:23 PM   #22
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Originally Posted by xcflyn View Post
Good idea. It almost looks like he could just go about 1/8" thicker in material. Those bolts are not sticking out the bottom by a thread even. Maybe mill the dia of the hole and use a good bottom tap? May save the machining of the inside if he can just be a little thicker in material ? Guessing the material is already .250+"
I don't know what the specs are for threaded fasteners in plate aluminum, but for rivets in sheet aluminum, Boeing specifies that edge margin is 2.5x the fastener diameter. That's why I picked that number. I would guess that he needs at least the diameter of the fastener of undisturbed metal between the bottom of the hole and the bottom of the screw boss.
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