Turning Shafts, Pins and Small Flanges on the TCK6340 Slant‑Bed CNC Lathe – Field Applications

A practical solution for high‑volume precision turning

Many job shops and production lines face a common challenge: turning large volumes of small to medium parts – shafts, pins, sleeves, stepped components, and small flanges – with tight tolerances and consistent surface finishes, all while keeping costs under control. The HAIDI Machine TCK6340 slant‑bed CNC lathe is designed to meet this challenge head‑on.

The combination of a rigid 45° cast iron bed, high‑precision linear guideways, a 5.5 kW AC spindle (0–3,500 r/min), and rapid traverse rates of up to 18/20 m/min makes the TCK6340 capable of handling a wide range of turning operations: outside diameter turning, facing, boring, grooving, and threading.

Application 1: Automotive shafts and stepped pins

Automotive components such as transmission shafts, hydraulic valve spools, and engine pins typically require turning of multiple diameters, shoulders, and sometimes threads. The tolerances are often in the ±0.01–0.02 mm range. On a manual or flat‑bed lathe, each feature may require careful operator adjustment, and consistency across a batch of 500 parts is difficult to maintain.

On the TCK6340, the gang tool post arrangement allows multiple tools – roughing, finishing, grooving, and threading – to be set up in fixed positions. The CNC program then brings each tool to the workpiece in sequence. There is no turret indexing time, so the cycle is as fast as the cutting operations allow.

For a typical 150 mm long stepped shaft made of 45# steel, the TCK6340 can complete rough turning of the major diameter, finish turning of the bearing journal, grooving for a retaining ring, and threading on the end in under 60 seconds. With repeatability of ±0.003 mm, the diameter variation across a batch of 1,000 shafts will be well under 0.01 mm.

Application 2: Electronic equipment pins and connectors

Pins and connectors for electronic equipment are often small – 10–50 mm in length – and require extremely consistent diameters and surface finishes. Material is often brass, stainless steel, or free‑cutting steel. The challenge is not cutting force but rather maintaining precision over long production runs.

The TCK6340‘s linear guideways eliminate low‑speed stick‑slip, which is critical for small‑diameter turning where feed rates are low. The 5.5 kW spindle provides more than enough power for these materials, and the optional bar feeder allows automatic feeding of bar stock, enabling lights‑out production. With the optional chip conveyor, the machine can run unattended for extended periods – loading a new bar, turning the pins, and discharging the finished parts.

Application 3: Small flanges and ring parts

Small flanges and ring parts – for hydraulic fittings, pneumatic couplings, and general machinery – require facing, outer diameter turning, inner diameter boring, and sometimes grooving for seals. The TCK6340‘s 400 mm swing over bed accommodates flanges up to 300 mm in diameter without difficulty.

The 45° bed slope directs chips away from the workpiece, preventing surface damage that can occur when chips are re‑cut. The 5.5 kW spindle provides enough torque for interrupted cuts when facing flanges with drilled holes or keyways. For a typical 150 mm diameter carbon steel flange, the complete turning cycle – facing both sides, turning the outer diameter, boring the inner diameter, and grooving the seal groove – can be completed in 120–180 seconds depending on material removal.

Application 4: Sleeves and bearing spacers

Sleeves and bearing spacers require parallel faces, concentric outer and inner diameters, and consistent length. The tolerance on length is often ±0.05 mm, and on diameter ±0.01 mm. On a manual lathe, achieving these tolerances consistently requires skilled operators and careful measurement after each part.

On the TCK6340, the program is written once and then runs identically for every part. The 0.016 mm positioning accuracy and ±0.003 mm repeatability ensure that the 100th part is the same as the first. The machine‘s rigid construction and linear guideways also minimise deflection during boring operations, which is critical for maintaining concentricity between the outer and inner diameters.

Setup efficiency and single‑setup turning

The gang tool post configuration of the TCK6340 makes setup straightforward. All tools are mounted on a fixed plate, each aligned to the spindle centerline. Once the tools are set, they stay in position. Changing from one part family to another involves loading a different program and, if necessary, changing the tool setup – typically a 15‑30 minute job on the TCK6340, compared to 1‑2 hours on a turret machine where each tool position must be individually aligned.

For job shops that handle many different part types in small batches, this flexibility is a significant advantage. The machine can be quickly reconfigured for the next job without complex fixturing or lengthy tool‑setting procedures.

Tooling and consumables

The TCK6340 accepts standard 20×20 mm tool shanks, which are widely available from all major tooling manufacturers. Typical tooling for a general‑purpose turning setup might include:

• One roughing tool (CNMG 120404 insert)

• One finishing tool (VNMG 160404 insert)

• One grooving/tool (3 mm wide)

• One threading tool (60°)

This set covers the majority of small to medium part turning requirements. For shops that already have a tooling inventory, integration is straightforward.

Cost‑effectiveness and return on investment

The TCK6340 is priced to be accessible for small to medium manufacturers, yet its specification – 45° cast iron bed, Taiwanese linear guides, 5.5 kW AC spindle, and ±0.003 mm repeatability – is entirely appropriate for high‑volume precision turning.

For a typical job shop running 500 stepped pins per week at 2 minutes each (60 seconds actual cutting plus load/unload and inspection), the weekly machine time is approximately 17 hours. If the same parts were produced on a manual lathe at 6 minutes each, the weekly time would be 50 hours. The labour saving alone (33 hours per week at a typical shop rate) will often pay for the machine within 12–18 months.

Practical preparation for buyers

Before the TCK6340 is delivered, users should prepare a level concrete floor capable of supporting the machine‘s weight (1,800–2,500 kg depending on configuration), provide a 3‑phase 380V 50Hz power supply (11 KVA total capacity, with stabiliser recommended), and have a suitable lifting device (forklift or small crane) for unloading and positioning.

Standard delivery includes the machine with gang tool post, 5.5 kW spindle, automatic lubrication system, coolant system, full enclosure, and a set of basic tools. On‑site installation and operator training are included.

➡️ To discuss how the TCK6340 fits your specific parts – shafts, pins, small flanges, sleeves, or connectors – or to request a trial cut or quotation, click here to speak with our application engineering team.