![]() ![]() Margin: The margin is the unrelieved part of the periphery of the land adjacent to the cutting edge. Land: The land is the section of the reamer between adjacent flutes. It is measured by projection into a plane tangent to the periphery at the outer corner of the chamfer.Ĭlearance: Clearance is the space created by the relief behind the cutting edge or margin of a reamer.Ĭutting edge: The cutting edge is the leading edge of the land in the direction of rotation for cutting.įlutes: The flutes are longitudinal channels formed in the body of the reamer to provide cutting edges, permit passage of chips, and allow cutting fluid to reach the cutting edges.įlute length: Flute length is the length of the flutes not including the cutter sweep. Therefore, reamers should not be used for heavy stock removal.Īxis: The axis is the imaginary straight line that by rotating the reamer between centers.īack taper: The back taper is a slight decrease in diameter, from front to back in the flute length of reamers.īody: The body is: 1) The fluted full diameter portion of a reamer, inclusive of the chamfer, starting taper and bevel 2) the principal supporting member for a set of reamer blades, usually including the shank.Ĭhamfer: The chamfer is the angular cutting portion at the entering end of a reamer.Ĭhamfer length: The chamfer length is the length of the chamfer measured parallel to the axis at the cutting edge.Ĭhamfer relief angle: The chamfer relief angle is the axial relief angle at the outer corner of the chamfer. The flutes guide the reamer and slightly improve the finish. Solid reamers do almost all their cutting with the 45-degree chamfered front end. The illustration shows the most frequently used style for holes up to 1 inch, called a chucking reamer. Reamer nomenclature - Here's the basic construction and nomenclature of reamers. Its principal support during the cutting action is obtained from the workpiece. ![]() ![]() Reaming is performed using the same types of machines as drilling.Ī reamer is a rotary cutting tool with one or more cutting elements used for enlarging to size and contour a previously formed hole. Reaming - Reaming has been defined as a machining process that uses a multi-edged fluted cutting tool to smooth, enlarge or accurately size an existing hole. This chapter will discuss internal threads and tapping, the operation that produces such threads. An internal thread is defined as a piece of material that has a helical groove around the interior of a cylindrical hole. When defining a screw thread, one must consider separate definitions for an external thread (screw or bolt) and an internal thread (nut).Īn external thread is a cylindrical piece of material that has a uniform helical groove cut or formed around it. They are used to hold or fasten parts together (screws, bolts and nuts), and to transmit motion (the lead screw moves the carriage on an engine lathe Screw threads are also used to control or provide accurate movement (the spindle on a micrometer), and to provide a mechanical advantage (a screw jack raises heavy loads). Screw threads are used for a variety of purposes and applications in the machine tool industry. They can be purchased ground to any desired diameter. Regular chucking reamers are made in number and letter sizes, in fractional inch sizes and in millimeter sizes. Reamers are usually made of High Speed Steel, although solid carbide and carbide tipped reamers are made in many sizes and styles. It will cut to within +0.0005 inches of tool size and give finishes to 32 micro inches. A reamer will not make the original hole it will only enlarge a previously drilled or bored hole. Twist drills do not make accurately sized or good finish holes a reamer of some type is often used to cut the final size and finish. ![]()
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