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Rifles, Reloading, Optics, Equipment
Gunsmithing
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<blockquote data-quote="Trickymissfit" data-source="post: 933159" data-attributes="member: 25383"><p>if you remove the barrel and shine a bright light into the female threads, you will often see a line running lengthways to the thread. That's the parting line from their tap. Nothing wrong with a tap except it's only as good as the bore was cut (often another operation), and the alignment of the fixture. But if you cut the bore and threads as one operation you will normally see a straighter thread. This puts everything into the same relationship. In otherwords the thread pitch diameter is concentric with the I.D. of the bore. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 933159, member: 25383"] if you remove the barrel and shine a bright light into the female threads, you will often see a line running lengthways to the thread. That's the parting line from their tap. Nothing wrong with a tap except it's only as good as the bore was cut (often another operation), and the alignment of the fixture. But if you cut the bore and threads as one operation you will normally see a straighter thread. This puts everything into the same relationship. In otherwords the thread pitch diameter is concentric with the I.D. of the bore. gary [/QUOTE]
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