Multi-indenter hammer drill bits and method of fabricating

A method of fabricating a down-the-hole hammer multi-indenter drill bit for use in down-the-hole hammer drilling of a hole, the drill bit including a plurality of indenters arranged on a drilling surface of a bit face, the method comprising:

• defining a drill bit face area;
• defining a number of drill bit indenters;
• defining a total area of the drill bit indenters,
• wherein a ratio, expressed as a percentage, of total indenter area to bit face area provides a value KPI1 (Key Performance Indicator 1), and a ratio, expressed as a percentage, defined by (the total area the drill bit indenters/the number of indenters)/(bit face area), provides a value KPI2 (Key Performance Indicator 2);
• and
• using the equation
• KPI2<=1.353×10−6(KPI1)5−1.527×10−4(KPI1)4+6.586×10−3(KPI1)3−1.301×10−1(KPI1)2+1.185(KPI1)−3.960
• to constrain a relationship between KPI1 and KPI2.