Table 2.
Parameter details in drilling fly ash geopolymer.
| Parameter | Details | ||
| Spindle speed (RPM) | 250, 200, 150 and 100 RPM | ||
| Feed rate (f) (mm/rev) | 0.075 mm/rev | ||
| Depth of cut (mm) | 0.30 mm | ||
| Cutting tool types | Coatings Thickness | Friction Coefficient | |
| HSS (Danyang Daming Tools, Ltd, Danyang, China) | N/A | 0.1–0.23 | |
| HSS Coated with TiN (Jiangsu Industry Co. Ltd., Yancheng, China) | 6 µm | 0.050–0.065 | |
| M35 HSS Co (5%) (Jiangsu Industry Co. Ltd., Yancheng, China) | N/A | 0.030–0.045 | |
| Tool geometry specifications | No. of flute | 2 | |
| Flute length (mm) | 50 | ||
| Shank diameter (mm) | 6 | ||
| Tool diameter (mm) | 6 | ||
| Overall length (mm) | 102 | ||
| Point angle (°) | 135 | ||
| Helix angle (°) | 25 | ||