View single post by romano
 Posted: Tue Dec 9th, 2008 07:33 pm
PM Quote Reply Full Topic
romano



Joined: Sat Dec 1st, 2007
Location:  
Posts: 301
Status: 
Offline
 It isn't just about the wear and lubrication its also about the chemical reactions that take place under the shear and pressure, like oils breaking down and oxidizing, metals corroding or having changes take place to stabilizing oxide layers, etc. Some of those lube free parts are capitalizing on the friction properties of these oxide and other layers which I believe is the original use of PVD and diamond like carbon . It also turns out to be decorative but was originally used for high tech tools and cutting edges to reduce wear.

Wrong lubricant for wrong application equals trouble. A pinch of vegetable oil might be useful short term to get a saw through a thick branch.  Try lubricating a slow moving metal part with soybean oil see what happens over time. Can you say gunk.

Also striking a match is a tribology problem , safety match has one component missing from match head and placed on strike pad . Under heat and pressure of movement chemical reaction (oxidation) goes.