A novel investigation of feed and spindle speed effects on cylindricity tolerance while drilling normalized and annealed mild steel and comparing the outputs with untreated mild steel

The main goal of this research is to evaluate the cylindricity tolerance of normalised and annealed Mild steel holes to untreated holes. This experiment employed a 10 mm mild steel plate. A muffle furnace normalised mild steel at 750°C and annealed it at 840°C. Drills made of tungsten carbide created the holes. The ASTM cylindricity tolerance criteria were followed. In the experimental (annealed and normalised Mild steel) and control groups, 39 test samples (N=39) are on each plate (untreated Mild steel). Sample size was determined using G-Power 80%. According to a one-way ANOVA using SPSS software, annealed Mild steel (0.0487 m) has a considerably lower maximum surface roughness tolerance than normalised (0.0541 m) and untreated (0.0587 m) (p0.05). This study demonstrated that mild steel surface quality increased with heat treatment, especially annealing.