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Mazak Slant Turn / SQT

Heavy-duty turning; the family that became Super Quick Turn

Bigger work, heavier interrupted cuts, and the kind of cycle-time-on-tough-material jobs that beat a Quick Turn to death. The modern continuation is the SQT (Super Quick Turn) line.

What the Slant Turn / SQT family is

Slant Turn is the older Mazak heavy-turning family — bigger chucks, longer beds, more rigidity. It evolved into the SQT (Super Quick Turn) line, which is the modern continuation. Both share the same lineage and most shops use the names interchangeably when talking about the heavier-end Mazak turning iron.

I've programmed and trained on Slant Turn / SQT for decades. The work that lands here is the work that crashes a Quick Turn's spindle bearings inside a year: heavy roughing on tough material, big-diameter parts, oilfield work, automotive transmission shafts. The Dana diff case line I worked on — the cycle-time reductions I documented came from re-thinking tooling and tool paths on this class of machine.

If your part fits a Quick Turn and runs comfortably, stay on the Quick Turn. If the spindle is grunting, the bed is flexing, or the part diameter is past the QT-350 envelope, you want SQT.

Models in this family

10 Slant Turn / SQT models we cover. Search for any of these by name to land here; for a specific question, use the contact form at the bottom.

ST-40

1980s–1990s

Controls: T-2, T-3, T-Plus

Older Slant Turn. Still found in production. The older T-2 and T-3 generation controls are getting harder to support — parts and tribal knowledge both.

Also searched: mazak slant turn 40, st 40, st-40

ST-50

1990s

Controls: T-Plus, T-32

Larger of the original Slant Turn pair. Same era as the ST-40.

Also searched: mazak slant turn 50, st 50, st-50

ST-50N

Late 1990s–2000s

Controls: T-Plus, T-32

Updated ST-50. "N" is the next-generation refresh; later Slant Turn lineage carries through here.

Also searched: mazak slant turn 50n, st-50n

ST-450

2000s

Controls: T-Plus, T-32, Matrix

Heavier than the ST-40/50. The transition era before the SQT name became standard.

Also searched: mazak slant turn 450, st 450, st-450

ST-500

2000s

Controls: T-Plus, T-32, Matrix

Big-bore turning. Pairs with M-spindle variants for shops that need milling features behind the chuck.

Also searched: mazak slant turn 500, st 500, st-500

ST-550

2000s

Controls: Matrix, Matrix Nexus

Late-generation Slant Turn before the family rebranded as SQT.

Also searched: mazak slant turn 550, st 550, st-550

SQT-200

2010s–present

Controls: Matrix, Matrix Nexus, SmoothG

Modern Super Quick Turn — direct continuation of the Slant Turn lineage. Same rigidity philosophy, modern control.

Also searched: mazak sqt 200, sqt-200, super quick turn 200

SQT-200MS

2010s–present

Controls: Matrix Nexus, SmoothG

Sub-spindle SQT-200. Transfers from main to sub for one-cycle completion on the right part.

Also searched: mazak sqt 200ms, sqt-200ms, sqt200ms

SQT-250

2010s–present

Controls: Matrix Nexus, SmoothG, SmoothAi

Mid-range SQT.

Also searched: mazak sqt 250, sqt-250

SQT-300

2010s–present

Controls: SmoothG, SmoothAi

Larger work envelope SQT.

Also searched: mazak sqt 300, sqt-300

Controls that shipped on Slant Turn / SQT

Across generations, these are the Mazatrol controls you'll find on a Slant Turn / SQT. Older controls are harder to get parts and programmer support for; newer ones have the modern simulator and unit logic.

  • T-2
  • T-3
  • T-Plus
  • T-32
  • T-32B
  • Matrix
  • Matrix Nexus
  • SmoothG
  • SmoothAi

Companion reading: What is Mazatrol? · Mazak G/M-code reference.

Common alarms on Slant Turn / SQT

Cherry-picked from the verified alarm library. Click through for causes, clearance steps, and the primary source for every claim.

ALARM 250

Spindle Start Misoperation

View causes & clearance steps →

ALARM 82

Spindle Warning (abnormal load)

View causes & clearance steps →

ALARM 35

Overload (servo)

View causes & clearance steps →

ALARM 22

Feedback System Malfunction

View causes & clearance steps →

Or browse the full alarm library (60+ alarms across all Mazak lathe controls).

Got a Slant Turn / SQT in your shop?

Send Tom the part, the machine, and the control version. 45+ years on Mazak lathes — I'll tell you what's possible.

Send a project(810) 965-8864