Runout vs Tool life and tool Performance study was done at the BIG Daishowa Mega Technical Center in Awaji, Japan.
The findings also show just how much significance a “small” amount of runout can have on a 3-mm drill. Runout of 0.0006 inch is close to the figure that shops considered good runout in the informal survey.
However, reducing the runout to well below this value improved the life of the carbide tool by almost 3 times. Even the least responsive tool saw tool life improvement of 60 percent.
Allowable TIR should be based on different values for tools of different diameters. Figure 2 shows the constant relationship between tool diameter and runout as a function of chip load.
The data is based on 0.0005 ” TIR as a starting point for a ½ “-dia. tool, from which the allowable TIR can be calculated for smaller tools and their respective chip loads.
This study shows that as run-out increases tool life dramatically decreases. With the improvement of performance tooling it is more important than ever to reduce run-out for maximizing tool life and performance.