Jack Shaft for Taig Lathe?

[Bear]

Update: Boring is a slow process. In any event, I am getting there. After drilling bore out to 7/16" on the Taig, I have bored it out to .535" so far. The depth of the bore is 1.9". The OD of the mild steel is .9085".
I am using the Taig steady rest (otherwise there is slight chatter at the bore entry). I am using a 3/8" boring bar with CCMT 21.51 insert (Korloy). There much more stick out of the bar than I would like. Taking a few spring cuts.
Nevertheless, I am getting no measurable taper as best as I can measure with telescoping gage. I am impressed with the capability of this little Taig with power feed.
I am aiming for a .750" bore; but, that will have to wait till tomorrow. Actually, the bore may be a little less so that I don't break through on the approximate 3/4" portion inserted in the chuck, or I may just shorten the bore accordingly. Doesn't look like the jack shaft will be neccessary, at least in the near future.

[crueby]

Excellent!

[Bear]

Okay, got the bore to .685". I think I will just stop here. The wall is getting thin. Final result is negligible taper of no more than .0001" to .0002" (larger at the tailstock end), if my measurements are correct with the telescoping bore gage.
The importance of this experiment    is that I have made a personal determination that the Taig is quite capable and accurate even with a somewhat larger steel cylinder such as the one I have turned.
Nevertheless, I still would like to reduce the speed for turning. Lapping the cylinder which would be required anyway would also need a much slower speed.
Thank you all who participated in this thread.