Agent Orange: Friendly fire that keeps on burning. | Seems like turning the bits slow and cooling them keeps them a lot sharper than they used to stay when I was oiling them. I think it has to do with the fact that a properly sharpened bit will have the cutting edge always digging into fresh metal. No way for oil to get there anyways. About all oil does is transfer heat away from that point. Of course if the bit gets hot and expands more than the workpiece, it will bind and cause heat if it isn't lubed. If it doesn't get hot, it won't expand. I can touch the bits as soon as I finish drilling and both them and the workpiece will be cool to the touch. Oiled bits can get so hot that they smoke and you sure don't want to touch those. |
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