Milling Cutters and Cutting Fluids - 4: Cutting Fluids
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Using water as a cutting fluid has two problems.
Therefore there are special cutting fluids available to solve the problem. The basic four types of cutting fluids for milling operations are all provided in a container similar to those shown here.
Please note that there are machining conditions where cutting fluid is avoided.
For example, when machining Polypropylene plastic, using a synthetic cutting fluid the plastic will absorb the cutting fluid making it grow in size temporarily.
Another example, when machining cast iron with carbide end mills, it is often recommended to use compressed air rather than cutting fluid to enhance tool life.