Although chippers can be very useful, they can also be dangerous if used incorrectly. As well as wearing protective equipment and following the manufacturer's instructions, it is important to ensure that the wood being chipped is free of any foreign objects such as stones, nails or wire. These objects can damage the machine's blades and cause them to malfunction. It is also important to keep the machine's blades sharp and to maintain the machine regularly. Finally, it is important to keep the machine on a level surface and not leave it unattended while it is running.