Hi group
As you may surmise I am in need of some serious quantities of ground foam. I would have to sell my trains in order to buy the quantities I need.
I have an old food processor that has been doing a great job, but getting any quantity of finely ground foam was taking a long time.
Years ago I had ground some using a bench grinder with a wire wheel and it worked very well, but spread foam all over the place even trying to catch it in a large cardboard box. I had a large piece of egg carton type green foam and a small wire brush for my drill so I figured I would try using it on the foam.
You have to be very careful and run the drill very slow, and don't take a big bite and it works quite well to make fine foam.
I found it works best when you hold the brush parallel with the foam, it doesn't catch as often. I also left the brush a little loose in the chuck so it would slip when it caught. Remember clamp the foam on the side of a large container so you have both hands to steady the drill, and don't run it fast. It will catch no mater how careful you are so be careful, and in 20 minutes I made a 3 pound pretzel container full of foam.
If you don't have green foam I would color it and let it dry before using this method. Go slow, be careful and it works like a charm.
Charlie