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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Nesika Bay actions........
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<blockquote data-quote="daveosok" data-source="post: 23966"><p>I was reading and saw that "Typically you reach a point where the action threads on most of the way but not quite all the way." this occurence can be caused by two things.</p><p>First tool/part flex.</p><p>Second incorrect thread perpedicularity.</p><p>If the tool and or part flexs and we are talking .XXXX decimal places you end up cutting a very slight taper sort of like a pipe thread.</p><p>If your threading bit is not exactly perpendicular to the lathe bore center line you will end up cutting to a small degree buttress threads which will require you to keep cutting deeper in order for the threads to engage correctly all the way to a shouler.</p><p>I indicate the carbide insert with a tenth indicator in the X axis, its only about .430 thou long so actually a greater resolution dial indicator would be better but then youll start to see manufacturing deviations in quality when cranking the cross slide.</p><p>I have ordered a .625X.625 HSS and will wire edm the correct tool cutting angles on it.</p><p>This will allow me a greater length to indicate on when setting up to thread.</p><p>One other thing when threading make sure to do ample spring passes to get whatever little tool/part flex you may have and this may cure the afformentioned problem.</p><p>If you have the equipment thread milling is a much better way second to thread grinding which very few machine shops do.</p></blockquote><p></p>
[QUOTE="daveosok, post: 23966"] I was reading and saw that "Typically you reach a point where the action threads on most of the way but not quite all the way." this occurence can be caused by two things. First tool/part flex. Second incorrect thread perpedicularity. If the tool and or part flexs and we are talking .XXXX decimal places you end up cutting a very slight taper sort of like a pipe thread. If your threading bit is not exactly perpendicular to the lathe bore center line you will end up cutting to a small degree buttress threads which will require you to keep cutting deeper in order for the threads to engage correctly all the way to a shouler. I indicate the carbide insert with a tenth indicator in the X axis, its only about .430 thou long so actually a greater resolution dial indicator would be better but then youll start to see manufacturing deviations in quality when cranking the cross slide. I have ordered a .625X.625 HSS and will wire edm the correct tool cutting angles on it. This will allow me a greater length to indicate on when setting up to thread. One other thing when threading make sure to do ample spring passes to get whatever little tool/part flex you may have and this may cure the afformentioned problem. If you have the equipment thread milling is a much better way second to thread grinding which very few machine shops do. [/QUOTE]
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