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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tubb extractor
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<blockquote data-quote="Fiftydriver" data-source="post: 161701" data-attributes="member: 10"><p>Best way to do it is to use the bolt fixture from Brownells, a quality machine vice with true and sqaure surfaces and at least a good heavy duty drill press. I use my light mill/heavy drill press for this work. I have NEVER broken a drill bit drilling the 0.450 hole for the spring and plunger.</p><p> </p><p>One thing to keep in mind, make sure the drill is centered in the machined cut for the extractor. By that I mean if you look at the slot from the top the drill needs to be centered from side to side so that when it hits the radiused bottom of the slot, it will not walk one way or the other.</p><p> </p><p>A huge tip, get some solid carbide drill bits. They stay sharper much longer and last much longer as well. I believe I use the #37 on this hole as well as that is what is called for for the hole size which I think is 0.120". I do so many of these I don't even look at the instructions anymore.</p><p> </p><p>Another benefit of the carbide drill bit is that you can just run that sucker down in one or two passes to the entire 0.450" deep. If you back out every 50 to 100 thou you will whaller out that hole larger then it would be if you had taken only two or a single pass to drill the hole. I pour the cutting oil to the drill bit when doing this in a single pass and the carbide drills have no problem doing it in one pass.</p><p> </p><p>They cut the bolt steel like its warm butter, no comparision to a high speed steep or even cobalt drill bit. Spend a bit more and order in some solid carbides, they will be well worth your money. Also get some solid carbide end mills if you do not already have them. Makes the job much faster and easier as well.</p><p> </p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 161701, member: 10"] Best way to do it is to use the bolt fixture from Brownells, a quality machine vice with true and sqaure surfaces and at least a good heavy duty drill press. I use my light mill/heavy drill press for this work. I have NEVER broken a drill bit drilling the 0.450 hole for the spring and plunger. One thing to keep in mind, make sure the drill is centered in the machined cut for the extractor. By that I mean if you look at the slot from the top the drill needs to be centered from side to side so that when it hits the radiused bottom of the slot, it will not walk one way or the other. A huge tip, get some solid carbide drill bits. They stay sharper much longer and last much longer as well. I believe I use the #37 on this hole as well as that is what is called for for the hole size which I think is 0.120". I do so many of these I don't even look at the instructions anymore. Another benefit of the carbide drill bit is that you can just run that sucker down in one or two passes to the entire 0.450" deep. If you back out every 50 to 100 thou you will whaller out that hole larger then it would be if you had taken only two or a single pass to drill the hole. I pour the cutting oil to the drill bit when doing this in a single pass and the carbide drills have no problem doing it in one pass. They cut the bolt steel like its warm butter, no comparision to a high speed steep or even cobalt drill bit. Spend a bit more and order in some solid carbides, they will be well worth your money. Also get some solid carbide end mills if you do not already have them. Makes the job much faster and easier as well. Kirby Allen(50) [/QUOTE]
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Tubb extractor
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