Measuring tool length offset for CNC operations requires a convenient and accurate method. Here we drill a granite surface plate to help measure Tormach TTS tool holders with a height gauge. This replaces a small specialized surface plate from Tormach with a larger and more useful surface plate. We also look at how to perform tool length measurement, enter the offsets into LinuxCNC, and make use of tool length compensation in LinuxCNC. As an example, we measure the tool length of a Tormach facemill, and then test the facemill.

More information on drilling granite.

The core drill I used was called “20mm (3/4″ inch) THK Diamond PRO sintered segment hole saw core drills drill bit” on eBay and sold by “THK Diamond Tools”

Be safe and keep on creating!