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Rifles, Reloading, Optics, Equipment
Gunsmithing
How do you guys cut your threads?
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<blockquote data-quote="daveosok" data-source="post: 188045"><p>I was also taught in high school to use the 29.5 degree method. The teacher who was a retired journeyman machinist also taught us the straight in method.</p><p></p><p>This is where you use the carriage instead of the compound rest and just turn the dial in.</p><p></p><p>I have the luxury of having digital readout so I do not watch my dials.</p><p></p><p>If youre using HSS then the 29.5 degree method should probably be used, if youre using carbide you can go straight in.</p><p></p><p>I cant remember why he said or taught us both ways been a long time since high school.</p><p></p><p>Your dial method if you dont have dro is perfect keep using it.</p><p></p><p>Most of the lathes I have used have +/-.0005 some have even had +/-.001~.0015 chuck play when a force is applied perpendicular to the axis of the lathe bore. </p><p></p><p>The carriage also has some minute play +/-.0002 or so usually but you can adjust it so that its so tight you remove it all but then you wear out your way rub strips and way surface prematurely.</p><p></p><p>You can of course remove all play by tightening the way rub strips on the cross feed and compound rest.</p><p></p><p>I dont worry about it as I take around 7 spring passes to remove what imperfects are caused by tool deflection, part spring, and machine tolerances.</p><p></p><p>The biggest thing I worry about is getting the tooling bit perfectly perpendicular to the axis of the lathe bore. This ensures proper thread engagement.</p><p></p><p>If you are using the threading dial which it sounds like you are youre using it correctly and staying on the same number for the whole threading process in most cases.</p><p></p><p>I work on a very high precision lathe at work and cut on any even number or odd depending on what the call out is on the lathe plate, but the lathe is 75k so its tolerances and play are a lot more tighter. I only wish it had a larger bore its 1.5 now maybe a bit bigger 1.55.</p><p></p><p>Yep you are getting as close to perfect threads as you can barring the use of a thread grinder.</p></blockquote><p></p>
[QUOTE="daveosok, post: 188045"] I was also taught in high school to use the 29.5 degree method. The teacher who was a retired journeyman machinist also taught us the straight in method. This is where you use the carriage instead of the compound rest and just turn the dial in. I have the luxury of having digital readout so I do not watch my dials. If youre using HSS then the 29.5 degree method should probably be used, if youre using carbide you can go straight in. I cant remember why he said or taught us both ways been a long time since high school. Your dial method if you dont have dro is perfect keep using it. Most of the lathes I have used have +/-.0005 some have even had +/-.001~.0015 chuck play when a force is applied perpendicular to the axis of the lathe bore. The carriage also has some minute play +/-.0002 or so usually but you can adjust it so that its so tight you remove it all but then you wear out your way rub strips and way surface prematurely. You can of course remove all play by tightening the way rub strips on the cross feed and compound rest. I dont worry about it as I take around 7 spring passes to remove what imperfects are caused by tool deflection, part spring, and machine tolerances. The biggest thing I worry about is getting the tooling bit perfectly perpendicular to the axis of the lathe bore. This ensures proper thread engagement. If you are using the threading dial which it sounds like you are youre using it correctly and staying on the same number for the whole threading process in most cases. I work on a very high precision lathe at work and cut on any even number or odd depending on what the call out is on the lathe plate, but the lathe is 75k so its tolerances and play are a lot more tighter. I only wish it had a larger bore its 1.5 now maybe a bit bigger 1.55. Yep you are getting as close to perfect threads as you can barring the use of a thread grinder. [/QUOTE]
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Gunsmithing
How do you guys cut your threads?
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