What kind of lathe?
If you are using a metal lathe, then by all means the Aloris style quick release boring bar holder is the way to fly, that way you use the Carriage to bore, way faster, easy to align, and rock solid.
If you have a lathe like the Cuesmith Deluxe then make a saddle to mount on the carriage. A rectangular block of aluminum with a one inch hole bored through at the proper distance above the mounting surface of the cross slide will provide a very secure mount for a gun drill. Four socket head bolts can hold this to the carriage. If care is used in the machining of the block, you should easily be able to align your gun drill for drilling with the carriage. Also one can use the rear air fitting on the gun drill, and be able to put a dead center in your tailstock to align the drill using the center of the air fitting! I explained all this a couple years ago when I sold maybe 40 of these drills to Azers. Using the tailstock is very slow, and not needed. It is as easy to make a carriage holder as it is machining the drill end to fit in the tailstock chuck. Good Luck!
If you are using a metal lathe, then by all means the Aloris style quick release boring bar holder is the way to fly, that way you use the Carriage to bore, way faster, easy to align, and rock solid.
If you have a lathe like the Cuesmith Deluxe then make a saddle to mount on the carriage. A rectangular block of aluminum with a one inch hole bored through at the proper distance above the mounting surface of the cross slide will provide a very secure mount for a gun drill. Four socket head bolts can hold this to the carriage. If care is used in the machining of the block, you should easily be able to align your gun drill for drilling with the carriage. Also one can use the rear air fitting on the gun drill, and be able to put a dead center in your tailstock to align the drill using the center of the air fitting! I explained all this a couple years ago when I sold maybe 40 of these drills to Azers. Using the tailstock is very slow, and not needed. It is as easy to make a carriage holder as it is machining the drill end to fit in the tailstock chuck. Good Luck!
Maybe you shouldn't want someone else to travel that road also. I agree, in a week nobody can teach someone how to build a cue, I don't think you could teach someone how you build a cue in a week. Not meaning you can't teach, I mean there is not enough time for the content. You could spend a week just covering tools and there functions. But, to discourage someone from learning a new trade because they ask a simple question is certainly the wrong answer. The OP ask a valid question, "How should I modify this gun drill to fit my 1/2" chuck?" meaning, what is the best method? Probably hoping for a dozen different answers, not that any are wrong, but what fits my knowledge and ability best. 15 years ago I started a tool and die apprenticeship, I knew very little about the trade, but I'm quite mechanically inclined so it came natural to me. in a bonafide apprenticeship you spend X amount of hours doing many different small parts of the trade until you reach 8100 hours on the job. Plus schooling. In all those hours you work with many different journymen. Alot of times learning the same thing a bunch of different ways. In the end you find a way that works for you, maybe jelling a few different methods together. Just doing things without asking may get you by and you may be productive, but could there be a better way? You don't know if you don't ask. I'm not intentionally bagging on you, it just really bugs me when someone perceives a question as stupid, and the answer becomes worse than the question. Sorry for the long drawn out post.
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