Revision 1: Safety Precautions & Common ISO Codes in CNC Milling

Two common causes of accidents in CNC machining are the lack of knowledge and

• improperly ground tools.

• excessive use of coolant.

•  the use of an old machine.

• carelessness of the operator.

For safety, which one of the following control buttons must be activated when performing graphic plotting

• dry run.

• Mach lock.

• edit mode.

• MDI operation.

What safety feature is provided on the door of a CNC milling machine?

• It’s handle is made of plastic.

• It is made heavy to prevent ease of opening.

• It is independent and can be opened at any time.

• It locks automatically when the cycle run is started.

Injury to an operator working on a CNC milling machine is often caused by

• using blunt tools

• using the wrong cutting tools

• unsafe working habits or practices

• operating the machine at a high speed

Which one of the following safety precautions should be taken before measuring the work piece?

• Lubricate the machine.

• Remove the work piece.

• Stop the machine spindle.

• Remove the cutter from the machine.

To prevent the machinist from reaching the moving parts of a CNC milling machine, the machine is fitted

• safety signs.

• metal guards.

• alarm devices.

• an emergency switch.

One of the safety precautions to be observed in CNC milling operations is to

• use good quality cutters

• ensure cutting fluid is clean and clear

• use higher spindle speed and feedrate

• ensure that tools and works is securely clamped

What is the function of the “Dry Run” key on the machine control unit in CNC milling

• actual machining.

• machine warm-up.

• set up work origin.

• program checking.

Which one of the following safety precautions to be taken before CNC milling operations?

• Coolant must be turned on

• Carbide inserts must be new

• Machine door must be closed

• Machine table must be cleaned and oiled.

The most important reason for observing safety precautions in the workshop is to

• prevent accidents

• reduce machining time

• reduce machine downtime

• prevent damage to the machine