air raid siren makita angle grinder

thingiverse

3d printed parts that you can put on a angle grinder that makes the sound of a air raid siren, the battery operated makita DGA504 has the rigt rpm off 8500, if you put in on normal grinder the rpm is to high en the sound is not to good. i used a voltage regulator to lower the voltage, on the end of the video you can hear it if the rpm is to high https://youtu.be/_kfD__DsLIk also have a look at my other designs for more interesting stuff