chip conveyor

In high-volume CNC machining, managing metal waste is just as critical as the cutting process itself. A chip conveyor (or swarf conveyor) is an essential component of modern manufacturing, designed to automatically remove metal chips, shavings, and swarf from the machining area.

Integrating the right chip management system eliminates manual waste removal, recovers expensive cutting fluids, and drastically reduces machine downtime. This guide covers everything you need to know about chip conveyors, including the different types, their benefits, and how to select the best system for your facility.

What is a Chip Conveyor?

A chip conveyor is an automated mechanical system attached to machine tools, such as CNC lathes, milling machines, and machining centers. As the machine cuts metal, it generates sharp, hot fragments known as chips or swarf. The conveyor continuously sweeps, drags, or carries these chips away from the cutting zone and deposits them into an external collection bin.

Beyond waste removal, modern chip conveyors separate metal waste from valuable coolant or cutting fluid. By recycling this fluid back into the machine tool, manufacturers can significantly reduce operational costs and maintain optimal cutting temperatures.

Types of Chip Conveyors

Not all chips are created equal. The material you are cutting and the shape of the resulting swarf dictate the type of conveyor you need.

1. Hinge Belt Conveyors

The hinge belt conveyor is the most common and versatile type of chip management system. It uses a continuous, interlocked steel belt to carry chips up an incline and out of the machine.

Best for: Long, stringy, bushy, or curly chips.
Ideal materials: Steel, stainless steel, alloyed metals, and large aluminum chips.
Limitation: Fine chips can occasionally slip through the hinges and build up in the conveyor chassis.

2. Magnetic Conveyors

Magnetic conveyors utilize powerful stationary magnets mounted beneath a stainless steel slider bed. As the magnetic chain moves underneath, it drags ferrous chips along the surface to the discharge point.

Best for: Small, fine, or broken chips.
Ideal materials: Cast iron and other highly ferrous metals.
Key advantage: Since there are no external moving parts, there is almost zero wear and tear from abrasive metal dust. They are ineffective for non-ferrous metals like aluminum or brass.

3. Scraper (Drag Flight) Conveyors

Scraper conveyors drag metal chips along the smooth bottom of the conveyor frame using specialized steel flights (paddles) attached to a moving chain.

Best for: Fine, powdery, or short-chipping materials.
Ideal materials: Brass, copper, bronze, cast iron, and non-ferrous fine chips.
Key advantage: Excellent for operations that demand high-level coolant filtration, as they prevent fine particulate buildup.

4. Auger / Screw Conveyors

An auger conveyor uses a rotating helical screw to push chips through a trough. These are often used as internal pre-conveyors that push chips out of a machine’s bed and feed them into a larger external hinge belt or scraper conveyor.

Best for: Tight spaces within the machine enclosure.
Ideal materials: Mixed chip types, though long, stringy chips can sometimes tangle around the screw.

Key Benefits of Integrating a Chip Conveyor System

Upgrading or optimizing your machine tool chip conveyor provides immediate returns on investment across multiple areas of your operation:

Increased Machine Uptime: Operators no longer need to stop production to manually shovel out swarf. The machine runs continuously, increasing overall equipment effectiveness (OEE).
Enhanced Workplace Safety: Metal chips are razor-sharp and often coated in slippery cutting fluids. Automating their removal reduces the risk of operator lacerations and repetitive strain injuries.
Coolant Recovery: Conveyors are equipped with perforated tracks, screens, or secondary filtration drums. This allows coolant to drain away from the chips and flow back into the machine’s sump, reducing fluid replacement costs.
Extended Tool Life: Clearing chips away from the cutting zone prevents “re-cutting,” a scenario where the cutting tool strikes already-cut chips, leading to premature tool wear and poor surface finishes on the part.

How to Choose the Right Chip Conveyor

Selecting the exact specifications for your facility depends entirely on the variables of your machining process. Use this quick reference matrix to match your application to the right technology.

Material Type	Chip Shape	Recommended Conveyor
Steel / Alloys	Long, stringy, bushy	Hinge Belt
Cast Iron	Fine, powdery, broken	Magnetic or Scraper
Aluminum	Mixed (stringy & fine)	Hinge Belt w/ Filtration Drum
Brass / Non-ferrous	Short, fine, sand-like	Scraper

Additional Considerations:

Coolant Volume: If you use high-pressure coolant (HPC), you will need a conveyor with advanced drum filtration to handle the high volume of fluid and prevent fine chips from overwhelming the sump pump.
Discharge Height: Ensure the exit angle and height of the conveyor match the dimensions of your shop’s standard scrap hoppers or roll-off bins.

Frequently Asked Questions (FAQ)

Can one chip conveyor handle all types of metal and chip shapes?

No single conveyor is perfect for everything. A hinge belt handling fine cast iron dust will experience premature wear as the grit gets into the moving joints. Conversely, a scraper conveyor will quickly jam if fed continuous, stringy steel chips. If you run mixed materials, a combination conveyor (a hinge belt built with an internal scraper and rotating filter drum) is usually the best compromise.

How much maintenance does a chip conveyor require?

Modern chip conveyors are highly durable but do require regular preventative maintenance. Operators should visually inspect the belt and coolant screens daily. Weekly tasks include checking the chain tension and ensuring the motor is not drawing excess amps, which indicates a jam. Monthly, the bearings and drive chains should be inspected and lubricated.

What happens if a chip conveyor jams?

Most industrial chip conveyors are equipped with a torque limiter or a current-monitoring VFD (Variable Frequency Drive). If a heavy bundle of chips or a dropped tool jams the belt, the system will automatically shut down and trigger an alarm before the motor burns out or the belt snaps.

Do chip conveyors help with environmental compliance?

Yes. By separating cutting fluids from the metal scrap, your chips are sent to the recycler much drier. This prevents toxic cutting fluids from leaking out of transport trucks and meets strict environmental regulations regarding hazardous waste disposal.

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