Sunday, August 30, 2009

Death of a Rock Tumbler

When you first start a round of tumbling, one of the things you want to have happen pretty soon is the formation of a nice thick slurry. This is where the water, grit, and pulverized rock mix together to form an abrasive mud that covers all the rocks so that anytime they move they are being ground down by the grit. This really helps the process of polishing the rocks along but this slurry can cause a few problems. Mostly, you just have to be a little careful how you dispose of it. If it dries out it tends to harden like cement. Another problem is that is it quite abrasive so you want to be careful it doesn't get into any machines like the dishwasher. All in all though, a good slurry is a rock tumbler's friend. Occasionally though there are disasters. For instance...

The plastic barrels on my little rock tumbler eventually wear out. After a couple months in the course grind they start to weaken and show signs they need replacing. In the past I have always been able to catch them right before they went. This time however, I wasn't fast enough. I knew the barrel was reaching the end of its life but I thought I could stretch it out a few more weeks, I especially wanted to because replacement barrels are no longer available. One day I went down to the basement for something and noticed that my tumbler was making some strange noises (it always sounds like it is in pain but this was different). I lifted up the cardboard box I have over it that I use to dampen the sound and saw...

Losing the barrel was a blow because it left me with just two barrels when I like to use four (one for each stage), but the worst part, as you can see, was that all that nice abrasive slurry had leaked out and gotten into the tumbler itself. Now instead of my rocks being coated with mud that ground them down every time they moved, it was the moving parts of my tumbler. I tried to clean it out as best I could but the damage was already done. I nursed the tumbler along for a few days and used all the spare parts I could to fix it but in the end it was a lost cause, my little tumbler was dead. It's very quite in the basement now.

Monday, August 17, 2009

Current Project

My current project is a batch of mixed rocks I got from my parents for Christmas. I have no idea what most of them are. There were originally about 5 pounds so it has taken a long time in my little tumbler. It has been running 24/7 on the rough grind since January (I did say my tumbler was small). I'm finally getting close to being ready to move on to the next stage, hopefully in a couple more months. This project has depleated my supply of rough grit. Here's a couple of pictures of the rocks as I got them.

As far as what's what, about all I know is that the farthest rock on the left is amethyst. One of my and my wife's favorites. We really hope it turns out well. Anyone with any ideas as to what the other stuff is, please say so.

Make sure you click on the pictures to really see them.