I've downloaded the generic QT brochure.
Conveniently they spend 4 pages showing machine outside dimensions, but not one lousy word about turret options.
Maybe they dont make big deal out of it because they know clearance is no issue. I agree with CNCToolcat, that style turret has lots of clearance. This was never an issue on the QT-200 MSY I used to run sometimes. A neighboring boring bar would not hit chuck, just had to watch the sheet metal behind the chuck.
If its a mazak with 8" chuck and that style turret I dont think you will do any better for clearance anywhere. The OD tools go pretty close to sheet metal though. I think they guys had a parting tool hit one time. This dimension might actually be better on doosan. Im just guessing, but if thats a big deal might want to double check.
Yamazen in Hartford distributes and supports Takisawa Japan. The TCN-2100 machines are 8" chuck with 2" bar capacity and 12 station turret with good clearance. We had a big run on these in the last year so you will need to check availability with your local team.
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Yeah, the twin upper turrets were pretty common on lathes in the bigger sizes as you go.
Ones that I have seen index together as well. (both turrets index with the same code - a mechanical link between)
IDK if they all did that?
Think Snow Eh!
OK, so I still did not make up my mind, but....
It would appear that somewhere along the way Haas has changed their standard BOT turret.
Downloaded the solid model of the ST-20, and after disassembling it I found that the turret size is more than adequate for an 8" chuck!!!
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So now I'm back to the other issue: The Haas tailstock stops 12" short of the spindle face!
I dunno... am I the only one who does ring work where the part is free-state located on a bung and is secured by pushing a face plate by the tailstock?
I need the live center tip to reach the surface of a standard chuckjaw!
Yup, I recall seeing on of those to, similar "cone" turret as the G&L I posted, and then Cincinnati added the "normal" turret too in your pix.
Too bad you can't turn, face, and bore at the same time like a turret lathe.
Distance from (lower turret) tool tip to main turret tool tip is a long way.
I wonder how many people punched a hole in the metalwaork behind the chuck while turning with the lower turret....!
Interesting concept tho
I believe that most of those type machines have an extended pocket above for the long tools.
Think Snow Eh!
Seymour, can I ask why the reluctance to go up a size on the machine and spec with 8" chuck?
Footprint, spindle speed... - are there obstacles beyond the obvious financial aspect?