ER20 Collet

thingiverse

I wanted to make a collet tray for my ER20 collets, so I drew these collet models to help me do it. I found that the measurements and standards vary a bit, so I actually came up with 3 different models. The inch model is based on the drawing I found on the MariTool website, the metric model is based on the drawing I found on AliExpress, and the measured model is based on my own caliper work with the set of DrillPro collets that I ordered from BangGood. All 3 models are based on the same 30deg nose and 8deg tail, because that specific was the same in both drawings (and I don't have an accurate way to measure that myself). All three are slightly different, but the collets that I measured appear to be closer to the 'inch' drawing's dimensions. Still, I figured that I'd include all 3 in case you have a different experience. My collets from BangGood also seem to all have a 10mm ID on the back side, so that's the size of the through hole that I added to these models. Your mileage may vary. Inches: https://www.maritool.com/Collets-ER-Collets-ER20-Collets/c21_56_62/index.html Metric: https://www.aliexpress.com/item/ER25-collets-4mm/523793862.html Measured: https://www.banggood.com/13pcs-1-13mm-ER20-CNC-Carving-Machine-Milling-Chuck-Collets-p-957223.html?cur_warehouse=CN Drawn with DesignSpark Mechanical. RSDOC source file included.