3D model description
Upload: February 28, 2024
Source: Programmable combination lock by nivs1978 on thingiverse
Here's a new door for my safe: https://cults3d.com/en/3d-model/various/mon-coffre-fort
But it's also a "Sargent & Greenleaf" type disc lock demonstrator, the video of which is here:
https://www.youtube.com/watch?v=jz2WVSoQBxM
This creation is completely removable so you can change your combination numbers.
It features a lever position control window.
Hardware required:
1 or 2 small elastic bands (diameter 2 cm, section 1x1 mm, or the equivalent in strength)
2 compression springs (5.5 mm diameter, 17 mm length) for the 2 hinges (but if the hinge slides with difficulty in its cylinder, you can do without a spring).
Superglue
very fine sandpaper (I used 800) to smooth the parts that slide together.
Printing:
Each STL file must be printed in 1 copy, except 12, which must be printed in 2 copies.
Pre-assembly checks:
the cylinder discs must fit tightly into the hole in the center of the door.
the knurled pin must slide easily in its central part in the cylinder discs. Sand this area if necessary.
the bolt must slide easily into its housing on the door.
the 3 discs must rotate with slight friction on the cylinder discs.
your printer's 1.75 mm filament tip should be able to penetrate the corresponding hole in the wheel and also the corresponding hole in the wheel axle. If not, enlarge with a 2 mm drill bit.
Assembly 1:
Insert and glue the cylinder discs from the outside of the door (photo).
Place the latch in its housing and insert the latch cover over it, gluing it to the door on both sides: the latch should slide easily (photo).
Assembly 2:
- Insert a combination pin on each of the 3 discs (photo): its position on the disc determines the combination number. Do not glue, but insert by force.
Assembly 3:
Insert disc 1 on the discs cylinder, with its ring facing the thumbwheel,
ditto for disc 2,
Insert the spacer,
then disc 3, its ring facing the cam (photo).
Assembly 4:
attach the thumbwheel axle to the thumbwheel using a piece of 1.75 mm filament from your printer (on a table, place the thumbwheel upside down then thread the axle through to the table, the holes will match).
on the outside of the door, place the thumbwheel washer centered on the flange of the cylinder discs, then insert the thumbwheel axle into the hole.
the cam (your choice: normal or simplified) is threaded into the free end of the axle, with its small pin pointing towards disc 3 (photo).INFO: I advise you to start with the simplified cam to get used to the mechanism, then switch to the normal cam, which complicates handling but is more secure.
Place the lever on the door and join it to the latch using the latch pin (photo).
the cam cover then slips over the knob pin,
and finally the key passes through the axle, holding and tightening the assembly, which can therefore be completely disassembled.
Final:
- place a rubber band (or several, or a larger but duplicated one) between the lever and the tenon on the door: its purpose is to make the lever tooth rub on the discs and also to place the latch always in the closed position.
To understand how it works and set your combination numbers, see the enclosed texts.
All the doors and accessories for my safe are also in an attached Text.
INFO: to translate these texts into your language, I recommend reverso.net, a free and powerful online translator.
To see all my creations on cults3d.com, click on my name.
3D printing settings
Most elements are printable in this way:
layer: 0.20 to 0.40
fill: 20%
border: no
support: no
raft: no
skirt: YES in order to start the extrusion properly
except for the following items, which require a lot of strength:
1_cylinder discs: 100% filling
16_levier: 100% filling + support
17_wheel axle: 100% filling
My tools, all free except photoshop :
fusion 360: powerful but complicated 3D modeler
tinkercad.com: my 3D modeler, simple and excellent for beginners!
openscad: 3D modeler by coding
cura: slicer, cutter
picsvg.com: to convert an image into SVG
photoshop: powerful image processing, but not free!
ideamaker: separates distinct elements of a 3D object
meshmixer: to correct defects in a 3D object or cut an object into 2 parts
spin3d: to convert 3D files into various formats
meshlab: to lighten a heavy 3D file