I made a bra that shoots sparks for self-defense

I made a brassiere that shoots hot sparks whenever someone tries to touch me instead of burning my bra. The bra has ferrocerium rods which produce hot sparks (temperatures of 3,315 °C) when striking the rod with dc motors outfitted with steel cutting wheels. It’s definitely one of my favorite projects ~

Here is how I made it:

Parts:

 

First draft of build

 

The Metal Bra

To make the metal boob shield I first traced out the shape onto the sheet metal - I really wanted it to look like a bra not just a shield.

Then, I cut them out with my metal shears. I did three main shapes - one for each boob and one middle part to join them together. I punched and drilled holes where I was planning to rivet the pieces together with the rivet gun. Then, to make it more bra like, I bent the shield to match my curves.

Then, I made metal mounts for the ferrocerium rods so they could have a little bounce and get bigger sparks. I cut, bent, and riveted these mounts to the bra and drilled holes so I could fasten the rods with the long screw.

I also made an L bracket and riveted it to the bra to mount the motors. I added two holes to the bracket so I could just zip tie them on.

I was inspired by Gaga’s bra and I noticed that hers had mirrors in the back so I put a mirror on each boob using the velcro. This is to reflect the sparks and make the bra even more of a spectacle. 

The Spark System

I made a simple circuit to connect the motors to a button and a 9V battery.

 
 

I mounted two cutting disks with a washer in between to each motor. So when I push the button the motors with the cutting disks spin. I zip tied the motors into place so the wheels were against the ferrocerium rods.

Aaaand that’s it - I used suspenders as straps and it became a bra.

 

Okay love you byeeeeeee ~

 
Estefannie1 Comment