![]() If a tool breaks and kicks back at the bore on the tool holder it may be damaged. Many gauge lengths available, from very short and rigid to long. ![]() In most cases smaller than collet chucks. Most tool holder companies will have plenty of stock and fair pricing. Once set screw is clamped on the shank flat, slippage is rare. Shank stays on center even when set screw is clamped. Maritool especially makes end mill holders with tight on-size bores. A quality end mill holder balance should be fair to good.These have a special collet nut that has a reduced outside profile to help get into tighter spots they cost a few bucks more and require a custom spanner, but are WELL worth it. We use ER-16 for situations where you have to reach into a smaller pocket we prefer the “M” style from MariTool ( click for example).Of the ~75 CAT40 tool holders we own at the moment (writing this January 2018), I’d guess 60 are ER-32.A damaged collet can ‘transfer’ its damage into an otherwise good tool or collet chuck. Joking aside, mistakes do happen, but do NOT keep damaged collets or tools around the shop. If you damage an ER collet (or collet chuck), you can repair it by immediately putting the damaged item in the trash and purchasing a new one.Clean often! The ID of the collet chuck, the nut and the collet all need to be free of chips, swarf, debris and should be degreased to maximize gripping! We use acetone and a lint-free rag.Pull studs are machine specific for our haas, we use this model. Any MariTool ER collet chuck can be used for TSC (Thru Spindle Coolant) but you MUST use a TSC pull stud (a.k.a.Only buy high quality ER collets! We keep a few of the MariTool collet sets on hand and buy individual collets as needed.Never use a torque wrench to loosen or remove collet nuts!.ER32 collet chucks need to be tightened with a torque wrench! We TIG welded an ER32 wrench onto a 1/2″ adapter to fit on a standard torque wrench ( we use this one) and tighten to ~85 ft lb.We use the 1.85 gage length (the shortest offered) for maximum rigidity. We have tooled up our HAAS VM3 and HAAS VF2SS based on ER32 collet chucks.This may result in a broken tool and sometimes damaged workpieces. Grip: Under heavy roughing the shank may slip in collet.May also restrict machining next to fixturing or clamps. Nose diameter: Depending on the size collet system nose diameters can get fairly large and restrict coolant flow.Balance is decent but with so many moving parts balance can be thrown off.The inside of the collet can build up with lots of small chips. Collet nut and collet should be disassembled every time you put in a new tool for proper cleaning. Inventory of collets can become pricey, but in the beginning you can purchase only what you need. Inexpensive: Collet chucks are fairly inexpensive.Strong grip good for medium roughing applications.Replace the collet and you’re back in business. Break a tool and worst case it damages the collet. Collet chucks are often used to hold drills, taps, end mills, center drills, counter sinks, reamers, and many other tool types.By switching collets and you can grab any size shank within the collet’s range
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