b'Selecting the right toolholder for an application requires understanding some of the available options to enhance accuracy.By Alan Richter range of tool shank diameters and they are a fa-miliar, time-tested technology. (See the sidebar P art manufacturers have a host of toolholderon Page 34 for a brief history of the ER collet.)types to select from, but the ER collet is theHowever, while noting that all ER collets are not favoritehands down. created equal, Pulvermacher said they tend to Clearly, right now its the most popular, saidhave significant total indicator runout and being Bill Pulvermacher, director of marketing for YG-1able to grab a variety of shanks doesnt necessar-Tool (USA) Co. in Vernon Hills, Illinois. ily mean that all shanks are held adequately.End users gravitate to ER collets because theyThe flexibility is the reason people buy it, are relatively inexpensive, one collet can clamp ahe said, but the flexibility is also its downfall.YG-1 Tool (USA)28OCTOBER 2022Toolholding.indd 28 9/19/22 11:14 AM'