Tools made for machines are individually built for every type of milling process, which is undertaken by skilled cutting machine operators. Big companies have a separate department for work preparations. After the production of milling products, tools are taken aside and cleaned. Because there are high levels of wear and tear on milling and boring implements, they are monitored and fixed up, if needed. Hard metal tools are ground by qualified employees. These tools can be particularly sharp. Helical milling tools, used particularly for smooth surfaces, can cause cuts and injury, even when only lightly touched. Fiddling with these tools should therefore only be done with cut-resistant gloves.
Tools used for machines are commonly dirty due to cooling lubricants. This is particularly the case for the attachments of screw taps. Oil can enter the air when blowing on the workpiece. Therefore it is useful it wear breathing protection. Tools for machines are very expensive, and this is particularly the case for special tools, like rolling equipment. These forming tools can cost up to 10,000 euros. It is important to properly train staff so they gain awareness of how best to handle these tools.