Safety Rules for Working on a Lathe

In this article we will cover the safety rules for working on a lathe, and the workplace accidents that can happen when those rules are not followed.

Enclosing Moving Parts in Dedicated Guards

Rotating and moving machine elements can injure any part of the operator’s body. That is why it is vitally important that moving parts such as gears, pulleys and belts are enclosed in guards. Where possible, choose next-generation chip guards fitted with an interlock switch that prevents the chuck from turning while the guard is open. Guards of this kind protect against flying chips and also stop the machine from being started by accident if the guard has been left open.

When the interlocked chip guards described above are not used, leaving the chuck key in the chuck can lead to workplace accidents.

Emergency Stop Brake

Choose lathes fitted with a foot pedal that works as an emergency brake. Make sure nothing — a piece of wood, for example — has slipped underneath the pedal. You never know when you will need it. And do not forget: this pedal is for emergencies only. Using the foot brake for routine stops will shorten its service life.

Correct Stance and Work Clothing

From a safety point of view, the following points about your stance deserve attention:

Stand balanced in front of the machine.
Take up a position that keeps the machine’s control levers within easy reach.
Do not lean over the lathe chuck while working.

A balanced stance lets you react quickly if something suddenly goes wrong, and it also lets you keep working through long jobs without tiring.

safety clothing at the lathe: a student wearing a workshop coat

Wear suitable work clothing

What you wear at the lathe is a factor that directly affects your safety.

Apron and coveralls: The safest clothing for this work is an apron or a set of coveralls. The sleeves of your work clothing should be closed at the wrist or rolled up.

Cuffs and ties: Cuffs and ties should be avoided on work clothing, because they can be caught by the rotating parts of the machine.

Hair, watches, rings and the like: Keeping hair short and taking off items such as watches and rings is good practice for safety.

The risks of torn and loose clothing: Torn or loose sections are easily caught by the machine’s moving parts and put the operator in serious danger.

Are gloves used on a lathe? If the job involves handling sharp or pointed edges, gloves may be worn. However, they must be taken off before the machine is started.

Why safety glasses matter on a lathe: Always wear safety glasses or a face shield against flying swarf and oil droplets. Bearing in mind that this swarf is often very hot, protecting your eyes is vitally important.

Clamping the Work Securely and Centrifugal Force

The following points deserve attention when it comes to clamping the work and choosing the spindle speed:

Bear in mind that a very long workpiece overhanging the back of the spindle can whip around and create a hazard.
When the work is supported with a centre, the centre must seat fully in its socket.
The chuck jaws must grip the work evenly and fully. The chuck key must never be left in the chuck.
Remember that as the spindle speed rises, so does the centrifugal force trying to throw the work out of the chuck.

Leaving the chuck key in the chuck is one of the most common and most dangerous mistakes made on lathes. The moment the machine is started, the key is flung out at high speed and can cause serious injury.

Changing the Spindle Speed on a Lathe

If the speed of the lathe chuck has to be set or changed, this must never be done while the machine is running. While the speed is being set, the chuck is turned slowly by hand to check whether the gears have engaged properly. Once you are sure, the lathe can be started.

Removing Chips from the Machine

Chips caught between the work and the tool are removed with a hand hook. Chips should be cleared as follows: long spiral chips are pulled clear with a hook and never held by hand, while splintered chips are swept up with a brush.

These jobs should only be done once the machine has come to a stop, and never by hand.

Measuring and Checking Operations

All adjustment, calibration and measuring work should be done after the machine has stopped.

Why grounding the lathe matters, and how to prevent electrical accidents

Grounding is carried out in advance so that leakage in the machine’s body cannot give anyone an electric shock. When the machine’s electrical equipment is sound and of good quality, faults such as short circuits, switch failures, earth leakage and motor burnout become far less likely.

Why an orderly lathe is a safer lathe

The tools and accessories you use while turning should be kept in a set order. Tools you have finished with should be returned to their place. Working in an orderly way at the lathe also heads off the accidents that clutter causes.

an orderly lathe workstation with measuring tools laid out

Related Questions

Although the guard catches most flying chips, it may not give full protection from every angle. Safety glasses add a second layer of protection against the small particles the guard misses.

That pedal is designed for a sudden, hard stop; if it is used continuously the mechanism wears out and may not deliver the performance you expect in a real emergency. Using the regular foot brake for routine stops preserves the service life of this pedal.

Do not forget that a long workpiece overhanging the back of the spindle can whip around and become dangerous. Work of this kind should be supported with a steady rest, or run at a lower spindle speed.

As a general rule gloves should not be worn while the machine is running, because they carry the risk of being caught by rotating parts. If gloves are being used to handle sharp or pointed workpieces, they must be taken off before the machine is started.