A tip for keeping track of tips

I prefer turning tools with carbide tips because I don't like to stop for frequent sharpening. But those tips need to be rotated or replaced occasionally. To help me know how many sharp edges remain on a tip and when it's time to order a new one, I made the chart below, and keep it in a binder next to the lathe. You could similarly keep track of planer and jointer knives with multiple carbide edges.
—Paul Bianchina, Bend, Ore.