http://www.vhf.eu/en/Tools/Info/Cooling

Cooling/Lubrication

For working on most kinds of materials it is necessary – or at least recommended – to cool the cutting edge of the tool with air or lubricant. This improves the surface quality and prolongs the endurance of the tool.

If cooling is not possible, the recommended minimum values for rotational speed should be adhered to; the feed rate, however, should not be set too slow. In this case, the heat dissipation will be made by the chips, otherwise you will risk that the material scorches.

Recommended coolants/lubricants