So, my car has a bad case of the eccentric bolts being rusted solidly into the rear toe arm. Best practice repair is sawzall through the bolt where it goes through the outer bushing, then pop the bolt head from the mount, throw away the old toe arm (with eccentric bolt solidly rusted in side) and replace the whole arm assembly (and bolt). I reckon that I should be using cutting oil as hardened steel is going to take awhile. Cutting oil is nowhere to be found in the local big box stores (employees have said that they get a LOT of requests for it though). Can I get away with something like WD-40 or will I just end up lighting it on fire and causing myself even more problems? I've heard of people doing this procedure dry, but it can eat a whole pack of blades that way.
According to this Wikipedia article, WD-40 should probably work good. It also says to stay away from multi-weight oils (due to the detergents and other factors), but single weight oils should work just fine (like SAE10 or 20, if you can find them). According to the article, there are four things which cutting oil does for you:
- Keeps the workpiece at a stable temperature (critical when working to close tolerances). Very warm is OK, but extremely hot or alternating hot-and-cold are avoided.
- Maximizes the life of the cutting tip by lubricating the working edge and reducing tip welding.
- Ensures safety for the people handling it (toxicity, bacteria, fungi) and for the environment upon disposal.
- Prevents rust on machine parts and cutters.