We all know how versitile WD-40 fluid is for a wide range of uses.  But one that doesn't seem to come up too often is it's excellent lubricity as a cutting fluid for when you are machining aluminum.  I have compiled a list of highlights from a forum post on the Practical Machinist website.

• "I try a little WD40 on the work piece. Immediately the cutter quiets down, cuts smooth, makes larger chips rather than medium "shreds". All it took was just a small spray, and it was good for three or four passes too."
• "WD 40 and Aluminum are made for each other."
• "It will give you a mirror finish when using the correct endmill."
• "Ran into the WD40/Aluminum thing on my own a few years ago. Wonderful for it! I also like it for keeping water out under a distributor cap."
• "WD-40 also works great if you ever have the unfortunate task of grinding aluminum."
• "We go through gallons of WD-40 in the shop...." "A spray bottle of WD is at every machine."
• "Thanks much guys, as usual you are spot on. I did get an almost polished finish using the WD40."

Even though WD-40 has been around a while, and everyone seems to know everything it can do, there's always something new on the internet.

Got any interesting uses for it?  Let us know!