O_O !!!!!!!!
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Replying to @MorlockP
The saving grace is that it’s a bored hole and the diameter can be averaged in.
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Replying to @skiballar
not following ; you're using a boring bar at the lathe ?
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Replying to @MorlockP
Yes, 3/16” boring bar on Toolmaker’s dovetail lathe, averaging in high/low reading since parts are only “round” if I’m being charitable, as the diameter varies by .004”.
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Replying to @skiballar
so you're saying that the boring bar deflects enough that the hole is kinda oval? and you remove the bar and measure, and average the measurements, to decide when you're done?
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Replying to @MorlockP
Kinda, part is out of round, held in collet in headstock which forces it round(er), bored to tolerance, springs back to oval when removed from collet. Constant adjustments to counter actual OD measurements to ensure ID tolerance is held.
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Replying to @MorlockP
And of course, VP of operations wants them last Friday!
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Replying to @skiballar
NOT suggesting "oh, do it this way instead" ; merely quizzing you (so I can learn something!). I'd naively think if OD is out of round, first operation is to turn a nice round stub on part, then reverse it and hold newly round bit in collect what am I missing?
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Replying to @MorlockP
You are on the right track, if I were starting from raw stock, that’s exactly what I would do.
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ok, cool! 99% of my lathe experience is on a wood lathe, so my normal MO is turn between centers with a spur drive (metal equiv would be faceplate + dogleg ?), get a nice circumference-with-shoulder at one end, then remount in scroll chuck
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