Anyone ever see internal threads like this?
Anyone ever see internal threads like this?
(OP)
I'm reverse engineering this part and I sectioned the tube these (internal) threads were housed. I put it under my digital microscope to inspect the threads and I found these groves machined into the tip of each thread. I've never seen anything like it. I'm guessing their their to provide a tighter fit by deforing upon assembly, Can anyone identify this?





RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Anyone ever see internal threads like this?
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FWIW, this is essentially identical to what happens when rolling external machine threads as well, although it is dependent upon the exact shape and penetration rate of the dies during the rolling process.
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
It gets worse if the " tapping Drill " is a little oversized.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
RE: Anyone ever see internal threads like this?
The "grooves" are not in the root but at the crest. They are sometimes referred to as fish lips, bunny ears, or crest craters and are schematically depicted in discontinuity standards like ISO 6157-3 or SAE J123 and fastener procurement standards like ISO 7689, SAE AS7466, ASTM F835, etc.
RE: Anyone ever see internal threads like this?