To make records with our lathes we use a number of tools and pieces of equipment. One of the most essential is the stylus (colloquially called a “needle”) usually made of a sapphire or metal. The material the stylus is made of must be hard enough to make impressions of the right depth and sensitivity in our polycarbonate or PETG discs.
We have tended to order record lathe styli from one of the few creators who make them, but when they weren’t available a few months ago Joe decided to try it the DIY way, which has always been our favorite approach anyway.
We acquired a gem faceting machine, which uses a grinding wheel to polish and shape hard minerals. With the help of an experienced lathe buddy, Joe figured out how to operate the machine and, more specifically, which angles he needed to achieve to make a tiny piece of mineral into the right shape for embossing grooves into records. So far he has made styli out of ruby, tungsten, and high speed steel, and they’re all making great sounding records.
Here are pictures of the ruby one in Joe’s hand and under the microscope.
Joe calls this stylus “The Dark Wizard” because it reminds him of a wizard’s staff. This is ruby mounted on black powder high speed steel.
We use a microscope to get the relative angle of the tip and check for abnormalities.
For fun Joe also wanted to try an idea he’d been nursing ever since we got into “rock hounding” a year or two ago: He loved the idea of cutting records with a piece of almandine garnet we found in the Wissahickon Creek, where they are abundant but still exciting to find. This garnet has a hardness of ~7.5 on the Mohs scale, making it softer than sapphire (which ranks a 9) but, we figured, hard enough for our purposes.
Some pieces of raw garnet we harvested from the Wissahickon Creek
And we were right! Here’s a video of Joe cutting and then playing a record he made with the garnet stylus.
We’re having fun trying out new materials, thinking of ways to further hone our DIY process, and control more of the supply chain ourselves. Next Joe wants to try quartz, which is also abundant in our area and quite easy to shape into the styli we need.
