When precision is required—such as in aerospace, tooling, mold-making or automotive components—the quality of drilled holes matters. A Metal Drilling Machine and a well-configured High Speed Drill can produce holes that meet tight tolerances, smooth surfaces, correct diameters, and desired surface finish if properly used.

One of the first aspects is spindle stability and rigidity in the drilling machine. If the machine flexes or vibrates under load, even a high rotational speed from the High Speed Drill will lead to wandering, oversize holes, or rough bore walls. Thus, machine design with stiff frames, accurate bearings, and minimal runout are essential.

Another important factor is drill bit tip geometry. For example, split point (or “split tip”) drills can help with self-centering, reducing “walking” at start. Drill bits with pilot drills or spot-drilling help locate the hole, especially when accuracy in positioning matters. Also, the angle of the drill tip (point angle) must match the material: harder metals often require flatter point angles to distribute load; softer metals can use steeper angles.

Surface finish depends also on feed rate, speed, cooling, and chip removal. If chips tear rather than cutting cleanly, the edges and walls may be rough, with burrs. Using proper coolant flow, sharp tools, and allowing time for chip evacuation can improve finish. High Speed Drill usage must be balanced: going too fast without coolant or chip-clearance can degrade finish.

Finally, reaming or finishing operations may follow drilling when holes must meet tolerance and surface finish. Sometimes combination tools that both drill and ream reduce the need for separate operations, saving time while achieving tighter specifications. The Metal Drilling Machine's accuracy in positioning, depth control, and alignment plays a large role here.

Overall, for hole quality, the synergy between machine stability, tool geometry, cooling, and correct operational parameters with a High Speed Drill defines success.