The TCK6350B is a hard rail slant bed lathe rated for long-term unilateral cutting of 12 mm. Put plainly: you can take a 12 mm depth of cut on one side of the workpiece, part after part, without the machine loosening up or the insert failing halfway through the shift.
That number is the interesting part of this lathe. Travels and spindle bores are easy to publish. A sustained single-side cut is a claim about rigidity, and it is the line that separates a box-way lathe from a linear-guide machine of similar size.
What a 12 mm unilateral cut asks of the machine
Cutting force travels through the tool, into the turret, into the saddle, and down through the bed casting. The weaker that path, the more the machine flexes under load, and flex shows up as chatter, poor finish, and short insert life rather than as a positioning error on a spec sheet.
Hardened and ground box ways carry cutting loads over a much larger contact area than recirculating linear rails. Wider contact means less deflection per unit of force, which is why roughing work still lands on box ways while high-speed finishing tends to use linear guides. On the TCK6350B the 4300 kg of cast iron acts as a damper as well as a base, and the 18.5 kW spindle motor has enough headroom to keep torque on the tool instead of stalling against the cut.
Sustained heavy turning also puts heat into the bed and the spindle housing. A thick, heavy casting has more material to soak that heat up, which is the difference between a machine that holds size at 10:00 and one that starts drifting by lunchtime.
Box spindle: 96 mm through-hole, 85 mm bar
The spindle uses an A2-8 nose with a 96 mm through-hole and 85 mm maximum bar capacity, and it is built as a box-type spindle rather than a bolt-on unit. The box housing gives a longer bearing span and a stiffer spindle support, which is what lets the lathe run both heavy cutting and higher speed work without the front bearing loading unevenly.
Top spindle speed is 4500 rpm. That is honest for a machine of this class: it is not built to chase 6000 rpm in aluminum, it is built to remove steel. Chuck options are 10 in or 12 in, so bar feed and chucking work are both covered from the same spindle.
Swing, travel, and the work envelope
Swing over bed is 630 mm, with a 480 mm maximum cutting diameter. Swing over the cross slide is 370 mm, and 500 mm is the maximum cutting length. The 370 mm figure is the one that decides real jobs: it tells you how much diameter you can still cut once the turret is in position and the turning tool is engaged, not just how large a part will clear the bed.
X-axis travel is 270 mm, Z-axis travel 690 mm, and both axes rapid at 15 m/min. Tailstock travel is 500 mm with 100 mm of quill stroke, enough for between-centres work on shafts. Overall the machine measures 3300 x 1750 x 1890 mm and weighs 4300 kg, so plan the floor space and the lifting gear before delivery rather than after.
Turret and tooling
The standard tool holder is a horizontal 12-station servo turret. Twelve stations sounds like a small detail until you load it: OD roughing, OD finishing, facing, grooving, threading, and a spare boring bar can all stay set up at once. On heavy work that matters more than the index time, because every tool you do not have to swap by hand is a setup you do not repeat on the next job.
TCK6350B specifications
| Parameter | TCK6350B |
|---|---|
| Max. turning diameter on bed | 630 mm |
| Max. cutting length | 500 mm |
| Max. cutting diameter | 480 mm |
| Max. turning diameter on the skateboard (cross slide) | 370 mm |
| Spindle nose type | A2-8 |
| Main shaft hole diameter | 96 mm |
| Max. bar diameter | 85 mm |
| Spindle speed range | up to 4500 rpm |
| Spindle motor power | 18.5 kW |
| Chuck type | 10 in or 12 in |
| X-axis travel / rapid | 270 mm / 15 m/min |
| Z-axis travel / rapid | 690 mm / 15 m/min |
| Tailstock travel | 500 mm |
| Tailstock sleeve travel | 100 mm |
| Standard tool holder | Horizontal 12-station servo turret |
| Machine size (L x W x H) | 3300 x 1750 x 1890 mm |
| Machine weight | 4300 kg |
The full build sheet and current photos are on the TCK6350B product page.
Where the TCK6350B sits in the slant bed range
BONANZA builds several machines on this 630 mm swing platform, and the differences are worth knowing before you pick one.
The TCK6350D shares the same 630 mm swing, A2-8 nose, 96 mm bore and 85 mm bar capacity, but it runs at 12/12 m/min and is positioned as the higher-precision version of the platform. The TCK6350B is the hard rail heavy-cutting version: same envelope, built for the 12 mm single-side cuts and a heavier work mix.
Below it, the TCK6050D covers 560 mm swing with a 65 mm bore and an 11/15 kW spindle, and comes in 500 mm and 980 mm turning lengths. It is the right machine when parts are smaller and finish matters more than depth of cut.
For long shaft work, the TCK80B-1500 and TCK80D-1500 step up to 850 mm swing with a 120 mm spindle bore, a 90 mm bar capacity, 18.5/22 kW, and 1450 mm of turning length. If your parts are mostly long rather than large in diameter, look at the TCK70D instead, which reaches 2950 mm of turning length.
All of them are listed side by side on the CNC slant bed lathe series page.
Typical work
- Forging and casting blanks that need the skin broken in one pass instead of three
- Hydraulic cylinder bodies, rods and gland nuts, where 85 mm bar stock goes straight through the spindle
- Rolls, pins and stepped shafts on the tailstock
- Flanges, hubs and bearing housings that need a stable finish after heavy roughing
- Pre-turned blanks feeding a machining center, where the lathe only has to get close and leave stock
Shops that add this machine usually already own a lighter lathe for finishing work. The TCK6350B takes the cuts that machine should not be asked to take.
What to settle before you buy
Four things need an answer in the quote. Chuck size, 10 in or 12 in, which follows from whether you run mostly bar work or mostly chucking work. Whether you want through-spindle coolant, since deep-hole drilling on a heavy lathe benefits from it more than the spec sheet suggests. Whether a chip conveyor and bar feeder are part of the package. And the control configuration, which varies by order.
Send the part drawings and the material you cut, and the quote comes back matched to that work rather than to a generic list. The factory is in Shandong, China and quotes direct. Request a quote for the TCK6350B or reach the sales team on WhatsApp at +86 173 0632 8370.