Federal Signal Model A (Functional)

Important note

I don't own a real one and i took references from different websites, so it maybe not be 1:1 scale on every part!

This is my fully functional Federal Signal Model A. The Siren works with a 3-6V universal hobby motor. The Scale of this Siren is 1:1. Of course you can use an other motor, I recommend a motor with long shaft. 

How to build this Siren 

Step 1:  - Check your Hardware

To Start you need to print out the 3D models:

• Stator (1X)

• Rotor (1X)

• Stand (1X)

• Motor cover (1X)

• Cone (1X)

• Projector (1X)

Aditionaly check the hardware:

• M6x60 Screws (2X)

• M6 Nut (2X)

• DC 130 Motor (1X) (or other)

• Cable (Use 1 meter, if you want to install it 2-3 meters)

Tools:

• Screw

• Glue

• Soldering iron 

Step 2 - Built it togehter

As the first step in assembling it, you need to take the stand and screw it to the motor cover using the two M6 screws; to ensure a better fit, use M6 nuts. Next, take the motor and solder your cable to it. As I mentioned, I used 1 meter because I’m connecting it directly to a junction box; if you want to install it on a mast or something similar, you should use more cable, unless you’re using a junction box.

After you’ve soldered the motor, attach and glue the motor to the stator. The motor should fit; if it doesn’t, it’s best to print it again using a finer nozzle for better results.

Next, attach and glue the rotor to the motor. It’s important to let the glue dry first to ensure the rotor doesn’t rub. Then you can glue the cone to the stator and the projector underneath the rotor. After that, you can thread the wires through the holes in the motor cover and glue the motor cover to the rotor and projector. Let it dry for 12 to 24 hours, depending on the type of glue, and your siren is ready!

Videos

If you want to see how I built this siren, check out the video right here below. If you also want to build a control box, check out my video right below this one.