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Latching Lock for Micro Servo SG90 9G

d1b8ee51-0231-464e-8b60-bf6d919be25c.jpg Latching Lock for Micro Servo SG90 9G
30f112e3-287c-4825-96d1-4113ab4f7422.jpg Latching Lock for Micro Servo SG90 9G
1d7aa318-3e33-49ca-b4e3-a96677fef96e.jpg Latching Lock for Micro Servo SG90 9G
602a4263-73e6-4d65-be5c-dbc1dd696697.jpg Latching Lock for Micro Servo SG90 9G
c2963061-e0e4-40a3-aece-85b891e9cba3.png Latching Lock for Micro Servo SG90 9G
549be041-7b96-422e-881f-144c11163d0c.png Latching Lock for Micro Servo SG90 9G
f4c6b686-80ce-476f-842a-0bc6c997d64c.png Latching Lock for Micro Servo SG90 9G
749b7d13-3389-4f5d-b0f2-2e64e28e51c2.png Latching Lock for Micro Servo SG90 9G
trigger.stl Latching Lock for Micro Servo SG90 9G
latch.stl Latching Lock for Micro Servo SG90 9G
housing_upper.stl Latching Lock for Micro Servo SG90 9G
housing_lower.stl Latching Lock for Micro Servo SG90 9G
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  • housing_lower.stl
  • housing_upper.stl
  • latch.stl
  • servo_latch_07.skp
  • trigger.stl

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Publication date 2023-10-15 at 23:02
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Published to Thingiverse on: 2023-10-15 at 20:04
Design number 1516548
peaberry

peaberry

3D printer file info

3D model description

This is an automatically latching lock which is powered by a Micro Servo SG90 9G. This makes it easy and inexpensive to interface to most microcontrollers such as Arduino. It is designed to engage with a pin of 3mm to 4mm diameter (not part of this model). When the pin enters the slot, it causes the mechanism to latch. To unlock it, the servo is driven through a range of 45 degrees, which causes the lock to release. The mechanism is designed to have a large mechanical advantage, so it should be able to cope with quite a bit of load without stalling the servo motor.

We are approaching Halloween as I write this, so perhaps you could use it to drop giant spiders on unsuspecting guests :)

You will also need:
* 2x 3mm x 15mm brass shaft (or similar)
* 2x M3 x 15mm screws to secure the housing
* 2x small springs
* Grease

Use a drill to clean up the holes in the moving parts, so that they rotate very freely on the shafts. File or sand the parts to ensure they are smooth, and apply grease before assembly. Test the range of motion of the servo before assembly.

Sample Arduino code is included (example.ino), showing how to drive the servo.

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