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Odd Threads on Milling Machine
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<blockquote data-quote="pycoed" data-source="post: 7898517" data-attributes="member: 744"><p>Measuring the thread pitch on smaller holes is a bit of a bind - I believe gunsmiths use Woods metal (which melts below water boiling point - much loved to make spoons for apprentices to stir tea with apparently<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />) to pour into a hole then unscrew & measure the Woods metal male thread, which is a lot easier.</p><p>You could try by lightly oiling the hole threads & pressing a lump of Blutak or similar into the hole to fill the threads, then carefully unscrewing the plug. I've had varied success with this, it must be said, though it should work if you are careful. 3/8 & 1/2 holes should be achievable.</p><p>Thinking it over perhaps pouring paraffin wax may be a better bet?</p></blockquote><p></p>
[QUOTE="pycoed, post: 7898517, member: 744"] Measuring the thread pitch on smaller holes is a bit of a bind - I believe gunsmiths use Woods metal (which melts below water boiling point - much loved to make spoons for apprentices to stir tea with apparently:D) to pour into a hole then unscrew & measure the Woods metal male thread, which is a lot easier. You could try by lightly oiling the hole threads & pressing a lump of Blutak or similar into the hole to fill the threads, then carefully unscrewing the plug. I've had varied success with this, it must be said, though it should work if you are careful. 3/8 & 1/2 holes should be achievable. Thinking it over perhaps pouring paraffin wax may be a better bet? [/QUOTE]
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