Method of Sensing and Initializing A Zero Height for A Computer-Controlled Cutting Machine

A method of sensing and initializing a zero-height for a computer-controlled cutting machine comprising the steps of:

• (A) providing the computer-controlled cutting machine with a processing unit, a gantry-style movement mechanism, a work surface, a tool carriage, and a tool head, wherein the tool carriage is operatively coupled to the gantry-style movement mechanism, and wherein the gantry-style movement mechanism is used to position the tool carriage, and wherein the tool head is removably mounted to the tool carriage, and wherein the tool head is electrically isolated from the tool carriage, and wherein the tool head and the work surface are electrically conductive;
• (B) tracking a baseline electrical resistance across the work surface with the processing unit;
• (C) executing a downward movement of the tool head towards the work surface with the gantry-style movement mechanism;
• (D) stopping the downward movement of the tool head with the gantry-style movement mechanism, if a change in the baseline electrical resistance is detected with the processing unit;
• and
• (E) designating a current height of the tool head as a zero-height of the tool head with the processing unit, if the downward movement of the tool head is stopped by the gantry-style movement mechanism.