TNB said: Click to expand...
AlfaGTA said: Click to expand...
Hi TNB,The collet sits in an MT5 taper sleeve. What I mean is that I can (1) remove the drawbar then (2) extract the MT5 taper sleeve from the grinder and the collet is still in the sleeve, still gripping the 10mm ground pin too tightly for me to remove it with my fingers. To get the collet free I need to "thunk" the threaded rim of the collet with a length of 20mm diameter brass rod. Then the collet pops out of the MT5 taper sleeve, and the 10mm ground pin pops out of the collet.Hi Ross,My wife's not gonna like this. What brand and color work best?Your analysis of the release lever action is correct. Otherwise why are there hooks on the cam piece? BUT it does not work as designed, because the amount of free motion is only a mm or two, and the spindle is spring loaded to the left and has more than a mm or two of free motion to the right. So moving the lever to the right just pushes the spindle out to the right. This would work correctly on a machine where the spindle axial motion was blocked both to the left and to the right.I have not yet tried to "snap" because I don't have the system mounted correctly yet. The one that I got is for a later model of this grinder and so I needed to make some bushings and other parts for mounting it. I'm far enough along to verify the operation, but haven't yet modified the mounting bracket so that I can mount it properly and "snap" the handle. But it takes quite a wallop to free this, so I suspect that something else is wrong.
Many people, if approached on the street and asked for a definition of a collet, would likely develop a blank stare. Collets are integral parts of machining, and yet so many don’t know what they are or misrepresent them as chucks. As T.M. Smith Tool is known for their quick change tool holding systems, they know a thing or two about collet types, their capacity and the significance of these misunderstood and often underappreciated devices.
What is a Collet?
A collet is a form of chuck, but it is not identical. While a chuck is tightened around an object, a collet utilizes clamping pressure by forming a collar around the object being held, holding it securely in place. This clamping force is typing applied through a tapered design that uses a sleeve and inner cylindrical surface. While there are varying designs, all collet types operate by being pressed over the element to be held, resulting in both accurate alignment and static friction. While the collet is not suitable for every tool and operation, it does allow for self-centering, resistance against loosening, fast-chucking and steady clamping pressure.
Collet Types for Woodworking and Metalworking
As with any tool or chuck, there are a variety of collets, making them versatile clamping devices. However, in general, different collet types are used in two specific fields of construction and manufacturing.
It should come as no surprise that a collet is useful in woodworking, as it is a tool found in drill presses and other machinery. However, the collet is most often used in routers to hold the cutting bits in place. The collet is secured to the tool using a hexagonal collet nut, allowing it to be tightened or loosened to the motor arbor.
Metalworking
While woodworking may only have a few varieties of collets, metalworking uses many types with varying holding capacities. Granted, the standard metalworking collet is used for holding round bar or tools, but there are also hexagonal, square and other shaped collets for specific tasks and tools. In addition to the different shapes and styles, there are also e-collets and step collets. E-collets or soft collets are typically machined for a specific job while step collets are designed to hold larger pieces.
ER Collets
While there are several types of collets, ER collets are the gold standard when it comes to clamping systems. Developed by Rego-Fix and patented in 1973, the ER collet is manufactured and used worldwide as one of the most trusted clamping systems. The er collet chuck derived its name by combining the already established E-collet with the first letter of the development brand – Rego-Fix. These collets come in a standard series ER-8 through ER-50 with each series number referring to the receptacles tapered diameter size in millimeters.
While the revamped design allowed for broader clamping usages and convenience, the geometry and spring design make the ER collet useful only for cylindrical parts, meaning that square and hexagonal pieces still require specialty collets, like the 5C. However, despite the drawbacks of the cylindrical design, this collet system is still widely accepted as the most versatile collet chuck system.
If you are confused about your collet or chuck needs, then it may pay to contact T.M. Smith Tool by calling a representative at 1-800-521-4894. They are experts in all your tool holding needs and have a variety of collet, chuck and quick change designs that may suit your manufacturing and production needs. Don’t waste another minute debating the differences between chucks and collets, or the value in upgrading or updating an old drill press or milling machine. Call and find a solution that works for your business needs today.
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