Originally Posted by dan_oz
Originally Posted by Mule Deer
Quote

In engineering (itself a term which has a range of meanings) "burnishing' is smoothing a surface by rubbing it with something harder, using cold-working not abrasives as John Burns said. It smooths without removing material. Polishing is using an abrasive to remove material to achieve a smooth surface.


OK, thanks for that definition.

I have another question: How does shooting copper or copper-alloy bullets through a steel barrel amount to "smoothing a surface by rubbing it with something harder" ?


Short answer: it doesn't.




Oh but it does..... an example is how a drop of water falling by gravity will eventually wear a hole thru stone, that same water under pressure will cut thru steel ,stone or most other materials, Have you never seen a dandelions grow up thru black top ?

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