Dial indikator

download Dial indikator

of 12

  • date post

    23-Jul-2015
  • Category

    Documents

  • view

    126
  • download

    7

Embed Size (px)

Transcript of Dial indikator

KoplingDari Wikipedia bahasa Indonesia, ensiklopedia bebasBelum Diperiksa

Kopling dua buah poros yang berputarTujuan utama dari kopling adalah menyatukan dua bagian yang dapat berputar. Dengan pemilihan, pemasangan, dan perawatan yang teliti, performa kopling bisa maksimal, kehilangan daya bisa minimum, dan biaya perawatan bisa diperkecil.Daftar isi 1 Manfaat 2 Jenis Kopling 2.1 Kopling Kaku 2.2 Kopling fleksibel 3 Pranala luarManfaatKopling digunakan dalam permesinan untuk berbagai tujuan: Untuk menghubungkan dua unit poros yang dibuat secara terpisah, seperti poros motor dengan roda atau poros generator dengan mesin. Kopling mampu memisahkan dan menyambung dua poros untuk kebutuhan perbaikan dan penggantian komponen. Untuk mendapatkan fleksibilitas mekanis, terutama pada dua poros yang tidak berada pada satu aksis. Untuk mengurangi beban kejut ( shock load ) dari satu poros ke poros yang lain. Untuk menghindari beban kerja berlebih. Untuk mengurangi karakteristik getaran dari dua poros yang berputar.Jenis KoplingKopling KakuKopling kaku adalah unit kopling yang menyatukan dua jenis poros yang tidak mengizinkan terjadinya perubahan posisi kedua poros atau terlepas, disengaja atau tidak disengaja, ketika beroperasi. Kopling kaku merupakan pilihan yang tepat ketika kedua poros ingin dihubungkan dengan pengaturan posisi yang stabil dan presisi. Kopling ini merupakan kopling dengan usia pakai yang paling tinggi selama batasan torsi, RPM, dan beban dari poros dan kopling tidak dilampaui.Kopling fleksibel

Kopling beam dengan bagian ulir heliksnya

Rzeppa joint dan...

... Double Cardan Joint yang merupakan contoh dari kopling CV

Kopling roda gigi

Kopling Oldham

Universal jointKopling fleksibel digunakan ketika kedua poros ada sedikit perubahan posisi secara aksial, radial, maupun angular ketika mesin beroperasi. Beberapa jenis kopling fleksibel yaitu: Beam Kopling CV (constant-velocity) Diafragma Disc coupling Fluid coupling Kopling roda gigi (gear coupling) Hirth joint Oldham Rag joint Universal jointKopling beam, atau bisa juga disebut dengan kopling heliks, adalah kopling yang menghantarkan daya antara dua poros dengan memperbolehkan adanya perubahan posisi dari poros secara angular, aksial, maupun paralel hingga batasan tertentu, ketika poros bekerja. Desain dari kopling beam adalah sepotong kopling yang memiliki bagian yang kosong sepanjang badan kopling berbentuk heliks atau spiral, sehingga menjadikannya fleksibel. Kopling beam biasanya dibuat dari logam paduan aluminium, baja tahan karat, dan titanium.Gear coupling adalah kopling yang mentransmisikan daya antara dua poros yang tidak berada dalam satu garis. Kedua poros dihubungkan dengan poros ketiga di dalam kopling yang disebut sebagai spindle.Kopling CV adalah kopling yang memungkinkan untuk mentransmisikan daya pada sudut yang bervariasi dan pada kecepatan putar yang konstan. Kopling jenis ini biasa digunakan pada mobil front wheel drive dan all wheel drive.Universal joint adalah jenis kopling dalam bentuk dua batangan kaku yang memungkinkan terjadinya pembelokan arah transmisi daya dari sumber daya. Uniersal joint terdiri dari sepasang hinge yang berdekatan dan dihubungkan dengan cross shaft. Universal joint, walau dapat mentransmisikan daya yang tidak segaris, namun memiliki kekurangan, yaitu dapat memberikan output RPM yang tidak konstan walau input RPM konstan. Hal itu bisa menyebabkan getaran dan keausan pada komponen mesin.Pranala luarWikimedia Commons memiliki kategori mengenai Kopling

Wikidata: Clutches Shaft Coupling Glossary List of coupling types Flash Animation of Oldham coupler Biography of Oldham at Cornell University Animation Video of a shaft coupling Yutaka Nishiyama, From Oldham's Coupling to Air Conditioners

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded.The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. By careful selection, installation and maintenance of couplings, substantial savings can be made in reduced maintenance costs and downtime.Contents 1 Uses 2 Types 2.1 Rigid 2.1.1 Sleeve coupling 2.1.2 Flange coupling 2.1.3 Clamp or split-muff coupling 2.1.4 Tapered shaft lock 2.1.5 Hirth 2.2 Flexible 2.2.1 Bush pin Type flange coupling 2.2.2 Beam 2.2.3 Constant velocity 2.2.4 Diaphragm 2.2.5 Disc 2.2.6 Fluid 2.2.7 Gear 2.2.8 Oldham 2.2.9 Rag joint 2.2.10 Universal joint 2.2.11 Others 3 Requirements of good shaft alignment / good coupling setup 4 Coupling maintenance and failure 5 Checking the coupling balance 6 See also 7 References 8 External linksUsesShaft couplings are used in machinery for several purposes. The most common of which are the following.[1] To provide for the connection of shafts of units that are manufactured separately such as a motor and generator and to provide for disconnection for repairs or alterations. To provide for misalignment of the shafts or to introduce mechanical flexibility. To reduce the transmission of shock loads from one shaft to another. To introduce protection against overloads. To alter the vibration characteristics of rotating units. To connect driving and the driven partTypesRigidA rigid coupling is a unit of hardware used to join two shafts within a motor or mechanical system. It may be used to connect two separate systems, such as a motor and a generator, or to repair a connection within a single system. A rigid coupling may also be added between shafts to reduce shock and wear at the point where the shafts meet.When joining shafts within a machine, mechanics can choose between flexible and rigid couplings. While flexible units offer some movement and give between the shafts, rigid couplings are the most effective choice for precise alignment and secure hold. By precisely aligning the two shafts and holding them firmly in place, rigid couplings help to maximize performance and increase the expected life of the machine. These rigid couplings are available in two basic designs to fit the needs of different applications. Sleeve-style couplings are the most affordable and easiest to use. They consist of a single tube of material with an inner diameter that's equal in size to the shafts. The sleeve slips over the shafts so they meet in the middle of the coupling. A series of set screws can be tightened so they touch the top of each shaft and hold them in place without passing all the way through the coupling.Clamped or compression rigid couplings come in two parts and fit together around the shafts to form a sleeve. They offer more flexibility than sleeved models, and can be used on shafts that are fixed in place. They generally are large enough so that screws can pass all the way through the coupling and into the second half to ensure a secure hold.Flanged rigid couplings are designed for heavy loads or industrial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges line up face to face. A series of screws or bolts can then be installed in the flanges to hold them together. Because of their size and durability, flanged units can be used to bring shafts into alignment before they are joined together. Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the coupling's performance as well as its life. Examples:Sleeve couplingA sleeve coupling consists of a pipe whose bore is finished to the required tolerance based on the shaft size. Based on the usage of the coupling a keyway is made in the bore in order to transmit the torque by means of the key. Two threaded holes are provided in order to lock the coupling in position.Sleeve couplings are also known as Box Couplings. In this case shaft ends are coupled together and abutted against each other which are enveloped by muff or sleeve. A gib head sunk keys hold the two shafts and sleeve together. in other words, this is the simplest type of the coupling. It is made from the cast iron and very simple to design and manufacture. It consists of a hollow pipe whose inner diameter is same as diameter of the shafts. The hollow pipe is fitted over a two or more ends of the shafts with the help of the taper sunk key.a key and sleeve are useful to transmit power from one shaft to another shaft.Flange couplingThis coupling has two separate cast iron flanges. Each flange is mounted on the shaft end and keyed to it. The two flanges are coupled together with the help of bolts and nuts. The projected portion of one of the flanges and corresponding recess on the other flange help to bring the shaft into line and to maintain alignment. A flange which is provided with a shroud which shelters the bolts heads and nuts is called protected type flange coupling.Clamp or split-muff couplingIn this coupling, the muff or sleeve is made into two halves parts of the cast iron and they are join together by means of mild steel studs or bolts. The advantages of this coupling is that assembling or disassembling of the coupling is possible without change the position of the shaft. This coupling is used for heavy power transmission at moderate speed.Tapered shaft lockA tapered lock is a form of keyless shaft locking device[2] that does not require any material to be removed from the shaft. The basic idea is similar to a clamp coupling but the moment of rotation is closer to the center of the shaft.[3] An alternative coupling device to the traditional parallel key, the tapered lock removes the possibility of play due to worn keyways.[4][5][6] It is more robust than using a key because maintenance only requires one tool and the self-centering balanc