Method for indicating drill hole quality

A method for indicating drill hole quality associated with a hole drilled into, using manual drilling operations, a work piece made of a composite material using a drilling tool with an associated drill bit having a drill bit head, comprising:

• continuously monitoring, using a measuring device arranged on the drilling tool, values of a first parameter, wherein the values of the first parameter indicate an amount of displacement of the drill bit head into the work piece over a time interval, as the drill bit head creates the hole therein
• storing the continuously monitored values of the first parameter;
• correlating the continuously monitored values of the first parameter with a first threshold value;
• determining whether the quality of the drill hole is acceptable based on the correlation of the continuously monitored values of the first parameter with the first threshold value;
• continuously monitoring values of a second parameter that is indicative of a rotational speed of the drill bit head;
• storing the continuously monitored values of the second parameter;
• correlating the continuously monitored values of the second parameter with a second threshold value;
• determining whether the quality of the drill hole is acceptable based on the correlation of the continuously monitored values of the second parameter with the second threshold value;
• and
• indicating if the quality of the drill hole is not acceptable based on the the correlation of the continuously monitored values of the first parameter with the first threshold value and the correlation of the continuously monitored values of the second parameter with the second threshold value.

A drilling tool comprising:

• a measuring device;
• a memory;
• and
• processing circuitry, the processing circuitry being adapted for indicating drill hole quality associated with a hole drilled into, using manual drilling operations, a work piece made of a composite material using the drilling tool with an associated drill bit having a drill bit head, said processing circuitry configured to execute the following operations:
• continuously monitoring, using the measuring device, values of a first parameter, wherein the values of the first parameter indicate an amount of displacement of the drill bit head into the work piece over a time interval, as the drill bit head creates the hole therein;
• storing the continuously monitored values of the first parameter acquired during the time interval;
• correlating the continuously monitored values of the first parameter indicating an amount of displacement of the drill bit head into the work piece over the time interval with a first threshold value;
• and
• determining whether the quality of the drill hole is acceptable based on the correlation of the continuously monitored values with the first threshold value.