Threaded bible and core

[jimu57]

By request, I have made threaded chamber practice locks for people. In fact, it has been in a set. One practice lock with no threaded chambers and one with all chambers tapped in the plug and the bible. Both are tapped on top for easy pinning without removing the plug. By switching plugs and shells, you can have 4 possible practice lock assemblies. I normally sell those also with a mini pinning kit with several sizes of bottom pins, spools, serrated pins, extra springs, plain drivers, extra plugs for top of threaded chambers in the shell. Right now I have mortise/rim cylinders that I can make sets from. Keyways are Schlage C 6 pin, Corbin-67 6 pin, Arrow 6 pin, Schlage E 6 pin.

A set goes for $49 for forum members and 10% of sales goes to the forum. Anyone interested, let me know.

[Jacob Morgan]

For commercially available locks that are threaded, are they threaded or grooved? Threads would start at one side and travel down to the other--easy to do at home with a tap. Grooves would be a series of well, grooves, each parallel to the other. Done with a purpose-built cutting tool on a CNC machine.

Reason I ask is a serrated pin might really engage with a grooved chamber while a serrated pin might just ride on top of a the threads in a threaded chamber--could even reduce friction and make picking easier from a theoretical point of view.


Did have an idea a few years ago on making a threaded core (the core, not the chambers). The idea being that as tension was applied to the core the threaded end of it would act on a threaded sleeve that would then be pulled forward by the threads and jam mushroom pins in place. Never could work out the geometry just right but maybe someone else would be smart enough to make it work. The idea was to have tension work against a picker.

[Shackle Jackal]

threaded a couple chambers in the bible on a kwikset clone, I was surprised that it made that knockoff feel more like an american lock, kinda grabby and a little "crunchy" but still doable.
I feel like for me it was more the psychological factor that made it difficult, the threading did slow me down considerably but not a difficult as I had thought. I had the most trouble with spool pins in the threaded chambers, not so much with serrated. I found that odd because I struggle with serrated and feel confident in dealing with spools. Thanks for the feedback all !

[gumptrick]

One thing I've noticed is that it makes a big difference what sort of pins get put into special chambers (and that applies to other stuff like countermilling, not just threading).

If the pins are standard or if they are spools or serrated pins with relatively thick "ends" then they don't catch very well in the threading. The lock may feel a little "crunchy" when you pick it but otherwise the effect is minor. On the other hand if the spools have very thin, sharp, edges then they are much more likely to catch in the threading and that makes picking a lot more difficult. If the pins themselves had some threading on them--ideally with the same pitch as the threading in the chambers--then it would be even more likely to catch.