If the manufacturer doesn't specify lubricant types, then you're free to choose whatever, as Ken indicated above. Any oil is better than none, and, when machining dirty old cast iron, or after using emery cloth to work on a part, you should wipe the ways clean frequently, and re-oil lightly.
Oily smoke is irritating and unhealthy to breathe in, so don't machine with heavy cutting oils on the part if the cutting temp is high enough to make it smoke off. There are exceptions of course, but then you might want to rig up a ventilation fan to suck the fumes outside.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |