Ballsizing Drills: How to hold tight tolerances

This week we explore techniques to hold tight tolerances in your drilling applications.  Tom discusses the use and design of Ballsizing Drills, which can have a dramatic impact on consistently tight tolerances.  Given the right application, these types of tools can not only improve accuracy, but also eliminate the need to inspect every single part.

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Directions for Use

  1. Enter your data parameters into the fields on the left
  2. Click the green arrow in the center of the calculator
  3. Your answers will appear in the fields on the right
-- change calculator using buttons below -- Tap Drill MM Tap Drill RPM SFPM Helix Angle

Tap Drill Size

MM Tap Drill



Helix Angle