This instructable will take you through constructing a wooden bar combination lock. This particular lock will in fact be used to secure a minibar fridge due to some issues with the misappropriation of foodstuffs at my workplace. For a more complicate locking mechanism with more features check out (www.instructables.com/id/Wooden-Dial-Combination-lock-with-spring-release-/
) also by me.
This is a fast, relatively simple project that can be completed inside of 3 hours if you move quickly and don't make any major mistakes. Further you can plan around irregularities in your workpieces allowing for greater ability to use scraps.
3/4 inch pine
Step 1: Cut peices
Take your 3/4" pine, and plane it relatively even.
2 9x12" boards
2 3x12" boards
1 tapered 2,1/2x32" board, tapering out to 3,1/2"
5 3x24" boards
16 3,1/8x3 boards
10 3x1" boards
Arrange your materials neatly, affix the 3x12" boards to the sides of one of the 9x12" boards creating a notch in the middle
Step 2: Check your taper
If you have set the taper correctly on the 32" long board, it should slide into the notch, but not slide THROUGH the notch, it should snugly stop advancing if you attempt to slide it along. This is important if you want the lock to only release in one direction.
Step 3: Dry fit, and then glue, bars and risers
Arrange the bars and risers (3x24" pieces and 3,1/8x3" pieces)- The 3,1/8 pieces are ever so slightly higher then the 3" pieces allowing for them to slide with ease. Then carefully fasten them in place, I used wood glue, be sure not to let them slide about, or let the glue drip. Wait until dry.
Step 4: Mark Gaps with grease pencil
Mark the gaps with the grease pencil, the individual 'tumbler' stops will be placed here to prevent the rod from sliding out.
Step 5: Add stoppers
In this case I just loose fit some 1,1/2" screws, drivigin them in just enough so that they did not protrude out the other side of the wood. Always pilot your screw holes!