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.
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.
Companies concerned about strict quality requirements regularly check toolholder tapers for wear or inaccuracy because these conditions can jeopardize the results of a critical operation. However, a shop can check tapers quickly and reliably with air gages. These devices can be used effectively without special operator training. For measuring taper in a production environment, few other methods can match the speed and performance of air, as multiple-circuit air jets can be placed in very small taper gages.