don't mind the switch at all. seeing one receiver threaded is pretty much the same as seeing another. at least in principle isn't it?
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don't mind the switch at all. seeing one receiver threaded is pretty much the same as seeing another. at least in principle isn't it?
I take it that 13in. is diameter of swing over the bed? My Myford is more usually termed a 3½x31, aka 7in. (long bed and previously owned by one careful bassoon repairer.) I'd do it on that, taking progressive light cuts, so yours should be ample. You might get a little more rigidity, and thus smoothness of cut by holding the boring head in a headstock collet rather than the chuck, although being an eccentric tool you don't need the extreme concentricity collets are usually used for.
If you do use a tap, it can be aligned by the centre hole in its rear end, in a 60 degree headstock centre, and turned with a wrench. But the amount of force necessary to turn a large tap is brutal treatment of the cross-slide. With a some actions I would have a steel bar and brass shims to hold it against the turning force of the tap. With a long, thin-sided receiver like the Martini I would make sure it is clamped at both ends, and instead of that bar, a handle integral with one of the spacer blocks which raise it to the right height.
thanks Ballistics.