Disc Grinder Introduction

This is the content required for an introduction to our disc grinders - reading this does NOT replace the mandatory session with a tutor! It will make it a lot quicker though ;-)

Let's begin! First off, make sure you have read the machine's manual, if available (should be linked from its InfoBox).

Safety

Personal protection:

Breathing protection might also help depending on your material, but unless it can filter fumes you should always take care of sufficient ventilation. ^[1]

Dangers	Precautions
generation of hot sparks that are expelled in varying directions	wear goggles AND a face shield to protect your eyes never use it without the blade guard understand the spark direction, which will always be tangential to the point of the disc that is in contact with the workpiece coordinate your activity with others in the area do not attempt to vacuum up sparks! The dust collection bag could catch fire
sparks fly very far and deposit themselves as fine dust metal fumes and fine dust can be a health hazard when inhaled [2]	take care of sufficient ventilation and/or wear a fume-filtering respirator when working with a grinder
some of our grinders have no prevention of turning on after loss & restoration of power (keine Anlaufsicherung)	if the power has been lost for whatever reason, always return the power button to the "off" position before restoring it!
the workpiece heats up and stays hot for a while	wear suitable gloves to prevent burns from sparks or the workpiece
possible kickback if the disc gets caught on the material	put the workpiece in a vise or clamp it down during grinding hold the machine firmly with both hands, one-handed operation causes 40% of all accidents [3] try not to shift the disc during a (deep) cut let the disc get to full speed before you start grinding
aluminum can clog an abrasive disc and cause it to overheat until it breaks	do NOT use abrasive discs on aluminum
a disc that is off-center or loose is very dangerous	after inserting a new disc, let it run freely for a minute and make sure it runs safe and true

Changing Discs

Please avoid overtightening the nut holding the disc in place! It should only be tightened softly by hand but may be loosened with the associated "pin" wrench if necessary. The direction of the motor's rotation is enough to tighten the nut to the appropriate degree.

Suggested Reading

Besides these safety notes, you should know about abrasive discs, especially the difference between grinding and cutting discs!