Lambda Simplified? : This variant of the Lambda top is machined from a single piece of solid brass bar stock. This consumes 4x the amount of brass compared to the two-piece tops, but it also delivers a more perfect spin. Any machinist will tell you that the most accurate part is the one machined to completion without removing it from the machine.
This also means I went from 2 manual machining operations on the two-piece top, to 5 manual operations on the solid top. Does that make the Lambda Solid an even more unpleasant slog of boring, repetitive manual labor? Yep. Is it worth it? Totally.
Finally, the cycle time on the CNC is much higher because I have to remove 3/4" of diameter on the bar stock all along the length of the spindle. It also requires another deep drilling operation to get the spindle hole to 80% depth while on the CNC.
What's up with the hole in the spindle? That is 100% physics right there. Brass is more dense than aluminum; and making a top out of solid brass moved the CG (Center of Gravity) slightly higher when compared to the aluminum top. The CG must be below the Center of Mass or the top will not want to self stabilize. I tried a number of strategies to lower the CG on the top.
Nothing was working very well and I had the idea to drill out the core of the top "just to see what would happen." Like the discovery of Champagne, it was a happy accident. I'm a scientist at heart, and that is one perfect, beautiful 0.160 x 1.25" hole because it's EXACTLY what was needed to drop the CG right into the sweet spot for a perfect spinner. I bet you start to see this one on "other" tops out there in top land. It didn't take long for people to catch on to the ruby thing right? I don't mind that (much) but there's still some value in life for being the "original." At least that's what I tell myself.