Homemade Air Raid Siren made from a bench grinder

In this tutorial I show how to make an air raid siren using a standard bench grinder bought from amazon and plywood, its howl is quite loud but not so loud the neighbours complain

Bench grinder used was an Einhell TH-BG 150 and can be found here https://goo.gl/O9cCiP

My camera gear
Canon G7X http://goo.gl/hElOVh
Canon 80D https://goo.gl/kd49Qq
Rode VIDEOMIC PRO https://goo.gl/9l8fvX
Rode Deadcat Windshield https://goo.gl/tHTncw
Canon 15-85 https://goo.gl/KV3Exj

  / sean_beardon  
  / sean_beardon  
  / projectmayhemuk-1674753232774151  

00:00 Intro
00:17 Cutting out ply wood
01:46 Screwing ply wood together
02:54 Rounding off lumps wood lathe style
05:15 Making plate steel mounts
08:36 Making the rings round using a router
10:13 Cutting out the vents
11:28 Cutting out the blowers
13:17 Spray time
13:44 Assembling the finished siren
14:49 Links