The deep-hole drilling diameter refers to the diameter of a deep-hole drilling, i.e., a bore with a large length-to-diameter ratio that is introduced into components such as spindles, shafts, or nuts. In threaded spindles and ball screw drives, such a bore is often guided axially through the spindle.
The deep-hole drilling Ø affects:
- Weight reduction of the spindle
- Mass moment of inertia and thus the dynamic behavior
- Lubricant supply
- Installation space for media (e.g., oil, grease, coolant)
Technical aspects
Large deep-hole drilling Ø → low mass, but reduced bending and buckling stiffness
Small deep-hole drilling Ø → higher stiffness, but greater mass
The diameter must be selected so that strength and buckling load are not reduced to an impermissible extent.