ENGINEERING ANSWER
Drilling parameters depend on tool diameter, stack height, entry and backing materials, machine condition and the exact laminate system. Published fabrication guidance is a starting point for a qualified process, not one universal feed-and-speed recipe.
What to decide before release
Have the fabricator define hole size, plating allowance and aspect-ratio capability. For high-frequency transitions, coordinate the electrical via model with achievable tolerances. Inspect the resulting hole and plating quality through the supplier’s agreed process controls.
Checks to put in your design brief
- State finished hole dimensions
- Review aspect ratios
- Identify controlled-depth drilling separately
Important distinction
Avoid copying a single drill-speed reduction percentage into every RO4350B drawing.
Sources & basis
Material facts follow the cited source. Design checks are preliminary guidance, not supplier process instructions.