has anyone here ever worn out a liner lock or a lockback?

Yes and yes . The lockback in question was an early (1968ish ) Buck 110 .The liner was a CRKT , it became a slipjoint in about three months .

Chris
 
My Emersons (titanium liners) have all worn down but my Benchmade Mini AFCk and Mel Pardue 350 (stainless steel liners) are still going strong. I have heard that Ti wears quicker that 400 series SS. Luckily both Emerson and Benchmade have outstanding warranties and will fix/replace worn liners.
 
Ti actually wears pretty good which is why its hard to grind. It is softer than stainless though so it will indent and suffer from shocks more than equal thickness stainless. At least that has been my observations in testing. In the same thickness as a stainless lock Ti is like 2/3rds as strong as the stainless but it has better galling properties and also recovers from extreme bends and stresses applied to the body that would deform stainless. Overall titanium has a high strength to weight ratio and this makes it certainly strong enough for most all applications in knife making. The trade off is pretty good to go with titanium over stainless for a lot of makers. With no heat treating involved its another reason to like it but when you factor in the color anodizing option it adds that much more to its appeal. Not to forget that its lighter weight, has improved corrosion resistence, and is highly resistant to to acids, bases and solvents.

STR
 
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