b'H6-H9 standards, Doiron said.focused down the shaft of the toolcollet nut.They are designed to fit one spe- rather than fanning out, Miller said People get the idea that tighter cific tool diameter. . is better, but thats not the case, The company recently expandedDos and Donts Moonsaid.Whenyouover-its line of FPC collet chucks to in- When using collets, the thingstighten, youre over-stressing the clude Slim Line models. Availablethat shops doand dont do nut and collet, and the metal starts in 2 mm to 14 mm sizes, the slimcan make a big difference in howto yield and bend at some point.design and tapered shape of thesecollets perform and how long theyFor best results, he recommends models eliminate problems causedlast. One common mistake madethe use of a torque wrench for tight-by a toolholder when trying to ac- with collets is over-tightening theening. He said shops today can find cess work in confined areas or ne-gotiate challenging angles.These are specifically designed to get into very difficult areas during five-axis machining, Doiron said.Other recent developments in-volve collet designs that depart from conventional shapes. Most traditional collets have a taper. As the toolholder nut is tightened, this taper is forced into a matching one in the toolholder. Hydraulic chucks, however, lack this taper.Inside these chucks is just a straight bore, Miller said. So you need a tightly toleranced straight cylinder to go inside these holders.For hydraulic chucks, BIG KAISER Precision Tooling has introducedOMAX abrasive waterjets increase throughput and shorten straightreductioncollets.Oneturnaround times to add value on your shop floor.type, which is called Perfect Seal, seals the cutting tool shank so cool-ant can flow through drills at high pressure. The other, which is named Perfect Jet, lacks a seal but reduces the clearance between the collet and cutting tool to improve coolant delivery along the tool shaft.The idea is to keep the coolant contributorsBIG KAISER Precision Tooling Inc.888-866-5776www.bigkaiser.comEmuge Corp.800-323-3013www.emuge.comGet the whole story at omax.com/valueGuhring Inc.800-776-6170www.guhring.comctemag.com/cteguide.com31Toolholders.indd 31 5/14/20 3:01 PM'