TCK3100LY CNC Mill-Turn Machine: A Y-Axis Machine Built for Long, Complete Parts

Most shops that buy a mill-turn machine are chasing the same thing: fewer setups, fewer machines, fewer arguments between the turning cell and the milling cell. The TCK3100LY from BONANZA is aimed squarely at that problem. It swings 750 mm over the bed, turns parts up to 1000 mm long, and carries a real Y-axis with ±100 mm of travel, which is what lets you mill, drill and contour off-center features without moving the part to a second machine.

Here is what the machine actually gives you, spec by spec.

TCK3100LY at a glance

Why the Y-axis matters more than the brochure suggests

Plenty of “mill-turn” machines only do C-axis milling. They can mill flats and drill holes at the face of the part, but anything off-center needs either a live tool at a special angle or a second operation. The Y-axis on the TCK3100LY changes that. With ±100 mm of travel, you can machine off-center slots, keyways, flats and bolt circles at any point along the Z axis, and the part comes off the machine complete.

For a valve body, a pump shaft, or a hydraulic fitting with cross-drilled ports, that is the difference between one setup and three.

Turning capacity: 1000 mm of usable length

The machine turns up to 500 mm diameter over the bed, with a standard turning diameter of 380 mm, and takes parts up to 1000 mm long. The 750 mm swing over bed leaves room for flanges and stepped shafts without the toolholder colliding with the workpiece. If your work is mostly long and slender — motor shafts, rollers, tie rods — this is the size class where that extra length stops being a workaround and becomes the machine’s natural working range.

Spindle and bar work

The A2-8 spindle nose with an 85 mm bore is worth reading twice. An 85 mm bore means the machine handles 75 mm bar stock through the spindle, so bar-fed jobs that would normally push you into a bigger, more expensive machine can stay on this one. If you run a bar feeder and cut mostly 40 to 70 mm stock, the TCK3100LY sits in a sweet spot: a big enough bore to swallow the bar, and a small enough footprint to not dominate the shop floor at 8000 kg gross weight.

Axes and speed

X travel is 400 mm, Z travel is 1050 mm, and rapid traverse runs at 12/12/16 m/min on X/Y/Z. Those numbers are not record-breaking and they do not need to be. For a machine in this size class, the more useful detail is that the Z axis has 50 mm more travel than the turning length, so you are not fighting the stroke limit when you face both ends of a 1000 mm part.

Who should actually consider the TCK3100LY

If your shop does any of this, the machine is worth a serious look:

• Shafts and stepped pins up to a meter long that currently bounce between a lathe and a VMC
• Bar-fed parts up to 75 mm that need cross-machined features
• Valve, fitting or hydraulic components where off-center ports and slots decide the cycle time
• Job-shop work where setup reduction matters more than raw spindle speed

If your parts stay under 400 mm long and never need off-center work, a smaller machine like the TCK2300B or the TCK6050SY will do the job for less money. That is not a criticism of the 3100LY. It is just being honest about sizing.

Where it fits in the BONANZA lineup

The TCK3100LY sits at the long-work end of the BONANZA mill-turn range. The TCK2300B covers shorter parts up to 500 mm. The TCK6050SY adds a second spindle for bar work that needs back-end machining. And if you want the Y-axis concept in a lighter machine, the 2100LY is worth a look. Compare all of them against your actual part mix before you commit.

Bottom line

The TCK3100LY is a practical answer to a common problem: long parts that also need milling. The 1000 mm turning length, the 75 mm bar capacity through an 85 mm bore, and the ±100 mm Y-axis cover the cases that tie up two machines in most shops. It is not the flashiest machine on the market and it does not pretend to be. It just does the work in one setup, and in a job shop, that is what pays.

Ready to see whether it fits your part mix? Get the full details on the TCK3100LY CNC Mill-Turn Machine page, or talk to the BONANZA team about your actual workpiece list.