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How to machine a hole on a lathe?
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<blockquote data-quote="OHJEEZE" data-source="post: 4138265" data-attributes="member: 47878"><p>What was you using for lube on your parting tool? Generally all parting tools should be wet with some sort of lube.</p><p></p><p>If your parting tool is set too low, your part will want to ride up on top of the parting tool.</p><p></p><p>If I was machining your part, I would finish, id and od before parting.</p><p></p><p>If I can ovoid using a parting tool, I do!</p><p></p><p>Over the years I have found wd-40 the best lube for working aluminum. It keeps the aluminum from gumming up!</p><p></p><p>If I am drilling, tapping or parting aluminum, I will have wd-40!</p><p></p><p>I would not bother with a 4 jaw, unless I absolutely had to for accuracy sake.</p><p></p><p>If you can machine your part in the 3 jaw, dont hesitate to do so. If your 3 jaw has good repeatability, no wories!</p><p></p><p>If you remove your part from your 3 jaw and repeatability sucks and accuracy will suffer for what is required, then you might need a 4 jaw.</p><p></p><p>Rule of thumb is to finish your part before removal if and when possible whether using 3 or 4 jaw!</p><p></p><p>You want to have the maximum amount of your part in the jaws of your chuck and do your parting as close to the jaws as alowable.</p><p></p><p>Sometimes you'll want to use the tailstock and a center to help keep the part from flexing out of center and blasting your parting tool.</p><p></p><p>Many times it is best to finish the part with a hack saw when it is close instead of finishing with the parting tool!</p></blockquote><p></p>
[QUOTE="OHJEEZE, post: 4138265, member: 47878"] What was you using for lube on your parting tool? Generally all parting tools should be wet with some sort of lube. If your parting tool is set too low, your part will want to ride up on top of the parting tool. If I was machining your part, I would finish, id and od before parting. If I can ovoid using a parting tool, I do! Over the years I have found wd-40 the best lube for working aluminum. It keeps the aluminum from gumming up! If I am drilling, tapping or parting aluminum, I will have wd-40! I would not bother with a 4 jaw, unless I absolutely had to for accuracy sake. If you can machine your part in the 3 jaw, dont hesitate to do so. If your 3 jaw has good repeatability, no wories! If you remove your part from your 3 jaw and repeatability sucks and accuracy will suffer for what is required, then you might need a 4 jaw. Rule of thumb is to finish your part before removal if and when possible whether using 3 or 4 jaw! You want to have the maximum amount of your part in the jaws of your chuck and do your parting as close to the jaws as alowable. Sometimes you'll want to use the tailstock and a center to help keep the part from flexing out of center and blasting your parting tool. Many times it is best to finish the part with a hack saw when it is close instead of finishing with the parting tool! [/QUOTE]
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