Mini Hörmann HLS381 Warning Siren (LOUD)
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Small scale model of the Hörmann HLS 381 siren. Works on 125PSI, loudest siren I have built.
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Small scale working replica of the Hörmann HLS 381. Tested at 125PSI, it is the loudest siren I have built. Approximately 2 minutes run time on a 12 gallon tank.
It is recommended to keep the .STLs grouped as they are in the folders when printing, if possible.
Required working bed space - 210mm MINIMUM
Required hardware:
x4 M2 screws
x2 M3 x 6mm screws
x8 M4 screws
x1 540 frame DC motor
x1 1/8"ID setscrew shaft collar
x1 3/8" NPT male fitting - here you adapt the siren to your power supply. I used a barbed fitting connected to a 3/8" hose and an air solenoid.
Superglue
Hotglue/Epoxy
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Print chopper, chopperspacer, stator1, stator15.
Superglue stator15 to the open side of stator1. Centering is critical.
Install your 3/8" NPT male fitting into the bottom of the glued assembly. Secure any hose and hose clamps before further assembly.
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Print hornmanifold, stator2.
Superglue the previous glued assembly on to the flat side of hornmanifold. Take care to align the air holes with the corresponding ports on the face of hornmanifold.
Install your 540 frame motor on to the flat face of stator2. Red threadlocker is recommended.
Install chopperspacer with the sharp side facing the motor. Install chopper, take care to ensure the motor shaft isn't pushed back.
Verify air slot placement aligns with those on the stator. Modify chopperspacer if misaligned. If aligned, install your 1/8" setscrew shaft collar, and hotglue or epoxy it to the chopper hub. This is to ensure the chopper will stay attached to the shaft while spinning.
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Print horngaskets, manifoldgasket.
Merge the two assemblies, with manifoldgasket in the middle. Use x4 M2 screws to secure the sandwich.
Apply power to the motor to verify free running. Remove and sand any inconsistencies if rubbing.
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Print horn (x4), motorcover, motorcovercap, jbox.
Using M4 screws, secure the horns to hornmanifold. Insert the screws from the center of the assembly and thread in to the horns. Use the horngaskets to seal the sound.
Superglue motorcovercap to the top of motorcover, and superglue jbox to hide the wire hole.
Print stand.
The siren is finished.