What is the spindle bore of a CK-6140 CNC lathe?

The CK-6140 has a spindle bore of 66 mm (Φ66), with an A2-6 spindle nose. In plain terms: if you feed bar stock through the spindle, the practical limit is around 60 mm class depending on your chuck or collet — enough for most medium shaft and disc work.

Here's what else you should know about this spindle:

• Spindle nose: A2-6 — a rigid camlock-type mounting that holds standard chucks true under heavy cuts.
• Speed range: 50–2000 r/min, servo stepless. You get low-end torque for roughing bigger diameters and a genuinely usable top end for finish passes — a workhorse range, not a high-rpm one.
• Swing over bed: Φ420 mm; swing over cross slide: Φ210 mm; distance between centers: 750 mm. That's the working envelope for typical medium parts — shafts, discs, flanges, bushings, automotive and general-machinery components.
• Tailstock: 65 mm quill, 150 mm stroke, M4 taper for steady support on long shafts.

So who is the CK-6140 for? If your parts are medium shafts, discs, flanges or bushings, and you care more about rigidity and low cost per part than about spindle speed, this machine makes sense. If your work is small-diameter bar turning with long, slender parts, a Swiss-type lathe is the better fit — different machine, different job.

One practical note: the 66 mm bore is the hole through the spindle itself. What you can actually load depends on your chuck or collet setup, so check spindle bore and clamping diameter together when you're matching a bar feeder or planning second-operation jobs.

Want a recommendation for your specific parts? Send us the drawing — we'll tell you in 30 minutes whether the CK-6140 or a Swiss-type is the right call.

• Q: What is the spindle bore of the CK-6140? / A: 66 mm (Φ66), A2-6 spindle nose.
• Q: What's the max bar stock through the CK-6140 spindle? / A: Around 60 mm class — confirm with your chuck/collet setup.
• Q: What is the CK-6140 spindle speed range? / A: 50–2000 r/min, servo stepless.
• Q: Is the CK-6140 a high-speed lathe? / A: No — it's a rigid flat-bed machine for medium turning, not high-rpm work.
• Q: CK-6140 vs Swiss-type lathe, which should I choose? / A: Small-diameter, long, slender bar parts → Swiss-type; medium shafts/discs/flanges → CK-6140.