what are you using to control the orbital sander?
all you probably need is a 8.00 relay from radio shack
12VDC/10A DPDT Plug-in Relay - RadioShack.com
open up the switch that came with your fogger (remove screws/cover) there "should" be 3 wires going to the switch, one of the wires is a ground, one is "hot" and the other is the common wire.
find out which wire is ground and just cut it off, you dont need it.
take the other two wires and wire them to the relay in the Normally Open positions (the first two pins on either side, they sit horizontal over the bottom (vertical) pins) now, take a cheap extension cord (I use a 3-6' interior cord), cut off the female end and solder it to the two pins on the very bottom of the relay (you can see in the picture, the bottom pins sit vertical where the other sets of pins sit horizontal)
now, when power is applied to the bottom (vertical) pins, the connection will close on the normally open pins that sit above it, closing the connection on your fogger switch (just like if you had pressed it) producing fog.
now, hook your relay up to the same power source that will control your sander, so when power is applied to your sander, there will also be power applied to your relay causing a fog blast..
its really really super easy.. if you need any help hooking it up, reply to this thread and I can walk you through it.. ill even talk to you over the phone if you need.
I use relays for the exact same thing you are using them for (for fog) but I also hook one of my hacked screamer toys to the other set of pins, so when my prop is triggered, you will hear the amplified scream and a blast of fog.. its super simple and very effective.
if you really want to do it right, get a tripple or quad relay (3 or 4 sets of pins, instead of just 2) that way you can wire other stuff up to your prop to activate as well.. ever wanted to activate a "try me" button on a prop to get flashing eyes? well, you can with a relay.
Linear Mode
