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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Funny lathe mach'g update...
Awl--
And all what I lernt.... From the previous thread, had a helluva time drilling a 3/16 hole and then getting a 3/16 rod to fit inside it w/o hitting a peculiar step. Apropos of the advice in that thread, I reverted back to a previous strategy, which involved pre-drilling w/ a 1/8 drill, and then finishing w/ a 3/16 4 fl endmill--mostly because I wanted a flat-bottomed c-bore. I had gotten lazy, saying Ahh, forget about the flat bottom, just go straight w/ a 3/16 bit, and then all the subsequent problems. Now there is no problem whatsoever--nice *controllable* fit. So it seems that there *was* a chip/gouging problem w/ the 3/16 drill being used by itself, as suggested, but which escaped me for the following reasons. First, similar drilling of aluminum on the lathe had not presented such a problem. Second, drilling brass on a milling machine was always a no-brainer, never a problem. In both these cases, chip clearance was never an issue because in alum, the ribbon is sort of self-ejecting. In drilling brass on a mill, the spinning bit ejects the chips. BUT, In a lathe, w/ a *stationary* bit in the tailstock, and w/ fine brass chips, there is no spinning drill to power them up/out--they just sit there, and bind/gouge. I realized this today in re-sleuthing this thing out, as it dawned on me that I had to *peck like crazy* w/ the 1/8 drill--cuz of zero rotation of the bit. Could not ascertain for sure whether this problem had occured at the depth of center-drilling, as suggested by a cupla posters, but I think this probably was not directly related, altho there might have been some secondary contributions. So the problem is solved, w/ the new realization of the visissytudes of stationary drill bits. Never a, uh, dull moment. Appreciate all the feedback, hope the other person expressing similar problems finds this useful. ---------------------------- Mr. P.V.'d formerly Droll Troll |
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