For composite materials and aluminum assemblies, the maximum RPM of any drill should not exceed what value?

The maximum RPM of any drill for composite materials and aluminum assemblies is indeed 5000. This value is derived from the need to balance both efficiency and safety during drilling. When drilling in composite materials, which often include layers of resin and fibers, excessive RPM can cause the material to delaminate or generate excessive heat, leading to material degradation. Similarly, with aluminum, higher RPMs may increase the risk of work hardening or causing the drill bit to bind, which could result in poor hole quality or even tool breakage.

Maintaining the RPM at or below 5000 helps ensure that the drilling process produces clean, accurate holes while minimizing the risk of damaging either the drill bit or the materials being drilled. This limit reflects industry standards and recommendations for best practices in aerospace manufacturing, where precision and material integrity are critical.