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hanosh (Aeronautics)
24 Aug 06 3:48
hi,
could any one tell me what is meant by Knife edge condition and feather edge condition in relation to Aircraft structures.How to avoid these?
Thanks,
Hanosh
prost (Structural)
24 Aug 06 9:28
Knife edge, in one meaning of the phrase, means there is little to no straight bore. Drill a countersunk hole in a sheet or plate, you get a countersink, and a straight bore hole. If the countersink is too big, so there is no straight bore in the hole, then you get a knife edge. Side
view of a hole countersunk in a thin sheet--see how sharp
the edge between the countersink and the bottom horizontal
surface? that's the knife edge:
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no idea about feather edge.
rb1957 (Aerospace)
24 Aug 06 14:29
Knife-edging is when the rivet/fastener countersink is more than 2/3rds the thickness of the sheet ... this is general practise. i'd guess feather edge means that the CSK is >=100% of the thickness
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MESSERSCHMITT (Aerospace)
24 Aug 06 15:41
to avoid a knife edge, you need to dimple the skins under the head of the countersunk fastener. _______________________________________
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prost (Structural)
24 Aug 06 20:29
Sorry about my little stick drawing; it looked ok in the Preview.
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