How Long Does A Blish Lock Last?
Posted 03 November 2003 - 12:42 PM
Just bored at work........Brent
Posted 03 November 2003 - 06:14 PM
Posted 03 November 2003 - 07:52 PM
That is very interesting. Way more than I would have guessed for such a small, soft piece of metal under constant impact.
Posted 03 November 2003 - 08:15 PM
Posted 05 November 2003 - 10:45 PM
Posted 06 November 2003 - 10:00 AM
I have stayed out of this because I have no hard data to offer; empirical or otherwise. I can say that most of the Locks I have replaced have been do to their being damaged by incompletely machined WH receivers or mutilated by those trying to fit them and make them work in such receivers. I have replaced a couple that were worn to a point that it seemed prudent to set them aside.
The pre war prints call for a material of "aluminum bronze". In those days of minimal standards, that could have a broader meaning that we might like to have today, however, the composition is fairly basic and some parallels can be drawn with current standards with reasonable accuracy, I feel.
This material should have these aprox physical properties
Tinsel 94 ksi
Yield 53 ksi
Hardness Bn 183 (Rb90)
To help add relevancy, the hardness of a typical WWII receiver is apx. Bn 229 (Rb98.2 or Rc20.5) so the lock is not much softer at all.
If you ever try to file a lock you will be quite surprised at how difficult it is to cut. The aluminum bronze alloys are typically used between the steel parts of sliding machinery to enhance lowered coefficients of friction and reduce wear.
Because this is a complex part to make and the supply will dry up someday, I have 3 new locks in my personal spare parts collection, I will be surprised if I need more than one in my life time.
(Bn= Brinell hardness number; the international standard.)
Posted 06 November 2003 - 06:22 PM
Mine has over 10M and it's only a bit worn........
Posted 06 November 2003 - 08:11 PM
Posted 06 November 2003 - 10:58 PM
Posted 07 November 2003 - 08:44 PM
Posted 08 November 2003 - 12:28 PM
Posted 08 November 2003 - 05:12 PM