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Use of Conventional Manufacturing Techniques for Materials
Published in T. S. Srivatsan, T. S. Sudarshan, K. Manigandan, Manufacturing Techniques for Materials, 2018
T. S. Srivatsan, K. Manigandan, T. S. Sudarshan
Several reamers are available for performing the operation. A few of the commonly used ones are (1) hand reamer, (2) machine (chucking) reamer, (3) shell reamer, and (4) adjustable reamer. The hand and machine reamers are categorized to be basic types of reamers. Each reamer is used for a specific application. Reamers are usually made of high-speed steel or solid carbides, or have carbide tip cutting edges. No special machines are built for the operation of reaming. The drilling machine can be used for reaming just by changing the cutting tool.
Fitting using hand skills
Published in David Salmon, Penny Powdrill, Mechanical Engineering Level 2 NVQ, 2012
A reamer is a cutting tool used to accurately finish predrilled holes to size. Reamers have multiple cutting edges and are made from high-speed steel. They are designed to remove only small amounts of material and leave a smooth surface finish of approximately 0.8 µm, much better than an ordinary drill.
Cutting Tools
Published in Hassan El-Hofy, Fundamentals of Machining Processes, 2018
Reamers are rotary cutting tools used for enlarging and sizing holes by means of a multifluted cutting tool. Precision reamers are designed to enlarge the size of previously machined holes by removing a small machining allowance with a high degree of accuracy to leave smooth sides.
Experimental investigation on boring of HSLA ASTM A36 steel under dry, wet, and cryogenic environments
Published in Materials and Manufacturing Processes, 2019
C. Chandrasekhara Sastry, P. Hariharan, M. Pradeep Kumar, M. A. Muthu Manickam
Pipes play a major role in transporting liquids and gases in our day-to-day lives. In order to achieve this, drilling operation is carried out to produce holes of required dimensions. Drilling being an intricate process, the hole quality produced is contrived by different conditions such as workpiece material, attribute of the operation, tool material, cutting zone temperature, and cutting force.[1] Secondary operations, viz., reaming, broaching, boring, etc., are carried out to overcome the defects caused in drilling and to obtain close geometric tolerance values of the hole produced. In the reaming process, a reamer is used, which is a multi-tooth cutter which rotates and moves linearly into a drilled hole or an existing hole. Reaming operation provides close tolerances compared to other secondary operations. The main drawback of the reaming process is that it follows the already existing hole produced during the drilling cycle. Thus, reaming will not provide any significant changes if hole misalignments are present. Additionally, any misalignment which is preexisting due to the drilling process will damage the reamer if mounted on a conventional spindle for machining operation due to the high flexibility of the tool.[2] Furthermore, in secondary hole-making operations, the major constraint and limitation are when the hole machined is to be enlarged to a non-standard dimension. This is where boring finds its footing and is applicable in hole making of standard and nonstandard dimensions by choosing an appropriate tool. Ihsan Korkut et al.[3] after repeated experimental analysis in studying the deviation of circularity of bored holes by using Taguchi method determined that in boring operation, the length/diameter value of tool should be less than 3 for optimum results. Sudhanshu Kumar et al.[4] performed a nonconventional boring operation, and it was observed that the radial strategy of electrical discharge machining (EDM) is better suited for a boring operation compared to helical boring operation as the wear ratio is minimum. Operations that are also hole making include counterboring, spot facing, and countersinking. For all these operations, boring is the primary operation to accommodate different types of tools required for further enlarging the hole or for improving its surface characteristics.