Download Free 3D Model Pin-Tumbler Lock from MechanicalGIFs.com 3D Print Model

Summary
This is an acrylic model of a pin-tumbler lock, the most common kind of key lock, made from laser-cut acrylic. It should be possible to make using an ordinary desktop laser cutter able to cut 1/8″ (3mm) acrylic. Photos and videos can be seen at http://mechanicalgifs.com

Overview and Background
Instructions
This is a laser-cutter project, which will require a supply of acrylic sheet and a laser cutter able to cut at least 1/8″ (3mm) acrylic. The model can be made entirely of plain clear acrylic, or the pins, key, or other parts can optionally be made of colored acrylic.
The file PinTumblerLock.dxf contains all the cutting and engraving patterns in separate layers. Lines in yellow are meant to be engraved, all other colors of line should be cut. Use the speed and power settings appropriate for your laser cutter: every one is different.
There are three layers in the DXF file:
A1 should be cut in 1/16″ (1.6mm) acrylic
A3 should be cut in 1/8″ (3mm) acrylic
G should be cut in 0.020 PETG or similar film.
The thicknesses can be changed if you like, just adjust the length of the screws that hold the model together to match the total thickness of the material you choose to use. The key and barrel part must add up the nearly the same thickness as the body of the lock (e.g. 1/16 + 1/16 = 1/8 as specified). The PETG film can be anything you like that is about 0.5mm thick. Its purpose is to provide a bit of space so the moving parts can slide freely. Only the A1 layer must be clear: all the other parts could be opaque if you like. (The model is particularly attractive if you make the upper and lower pins out of differently-colored plastic.)
A detailed assembly video showing exactly how to put the model together is available at https://mechanicalgifs.com/instructions
Lesson Plan and Activity
Lock Lesson
Locks are by their nature secret, but this one lets you see inside to understand exactly how the key serves to communicate a secret code to the pins of the lock, allowing it to open.
Materials Needed
Materials needed
(1) Approximately 8″ x 8″ (200mm x 200mm) piece of 1/16″ (1.6mm) clear acrylic.
(1) Approximately 4″ x 4″ (100mm x 100mm) piece of 1/8″ (3mm) clear acrylic.
(1) Approximately 4″ x 4″ (100mm x 100mm) piece of 0.020 PETG or similar film material. (Exact thickness is not important, it is used as a spacer to allow the moving parts to slide freely.)
(2) Optionally, approximately 1″ x 2″ (25mm x 50mm) pieces of 1/8″ (3mm) colored translucent or opaque acrylic.
(5) 1/8″ (3mm) x 1″ (25mm) very light spring.
(6) #2 x 5/16″ round-head machine screw (or metric M2 x 8)
(6) #2 hex nuts (M2)