Safety in Milling

In a milling process, even more coolant will circulate than in a turning machine, since the higher speed in the machine will cause even higher temperatures. In specific cases, a small milling tool or drilling tool will run at a speed of up to 40,000 rpm. This will cause extremely high temperatures. As an advantage to the safety pane, the working space in a milling machine is much larger than in a turning machine. The chips will have more time to lose temperature and speed. Additionally, their weight is much lower. For this reason, the wear of the glass pane caused by chips is considerably lower.

Problems due to Control Errors:
Theoretically, a milling spindle may run at a speed of up to 40,000 rpm, whereas the permissible speed limit of the applied tool is only 10,000 rpm because of its dimensions. This discrepancy must be settled by appropriate control settings, since there is no adequate protective equipment for such conditions. Such a milling tool may reach a speed of up to 300 m/s. Appropriate protective materials would be much too thick and much too expensive for use in practice. Appropriate control settings must be made to guarantee that a milling tool will not run at excess speed. It is reasonable to specify a speed limit of 210 m/s, for which safety windows with acceptable prices and thicknesses are available.