57MM DC Spindle

[Earwigger]

No kidding. It’s very gratifying to experiment on your own. Not to belabor the point but:

Anyone know how to make a spindle speed display

Just to be clear - the advantage of the SuperPID is that it reads the RPMs and adjusts the power to the motor to achieve your desired spindle speed. Everything else mentioned here simply tells you the speed of your spindle. So, for instance, you adjust your speed according to your homemade Arduino tachometer, then once is starts cutting and the bit is under load, the spindle speed will decrease substantially. The SuperPID adjusts the power to the motor to account for the load so your spindle …