I have been told that to harden steel after its been heated to cool it in used engine oil, the heat draws the carbon into the steel and makes it hard.
They say it only works in used oil, as new oil doesn't have the carbon in it.
If all that is true, would used oil be better for cutting and drilling than regular cutting oil?
If the used oil adds carbon to the steel, wouldn't it make the drills or cutters more hard?
What are you all's thoughts on the subject?
Thanks in advance:
They say it only works in used oil, as new oil doesn't have the carbon in it.
If all that is true, would used oil be better for cutting and drilling than regular cutting oil?
If the used oil adds carbon to the steel, wouldn't it make the drills or cutters more hard?
What are you all's thoughts on the subject?
Thanks in advance: