Video: Checking Toolholder Runout
This short video explains how to check the runout on a collet chuck toolholder.
Collet chuck toolholders wear out over time. According to Techniks, runout of less than 0.0002" is said to keep cutting tools cutting smoothly while preventing them from wearing out prematurely. If such precise runout can’t be achieved, then either the collet, nut or holder may need to be replaced. This video from Techniks explains how to check the runout on a collet chuck toolholder.
Hummingbird takes on machining work that is too small for most shops to handle. In fact, Hummingbird tries not to handle it either. To accurately machine the tiniest parts, this shop relies on processes that are as hands-off as possible.
The retention knob is an unmistakably critical component of the machining process. However, the tightening of the knob itself can lead to the toolholder not seating securely in the machine. You may be losing tool life to knob tightness without even knowing it.
I’ve said that the toolholder is the least appreciated element in many milling processes, but the pull stud (or retention knob) is perhaps the least appreciated component of the toolholder.