macam-macam bentuk pahat bubut *gambar dari McMaster-Carr catalogue |
Berdasarkan bentuknya,pahat bubut diatas dari kiri ke kanan adalah:
- pahat sisi kanan
- pahat pinggul/champer kanan
- pahat sisi/permukaan kanan
- pahat sisi/permukaan kanan(lebih besar)
- pahat ulir segitiga kanan
- pahat alur
- pahat alur segitiga(kanan kiri)
- paht ulir segitiga kiri
- pahat sisi kiri
- pahat pinggul kiri
- pahat alur lebar
- selain diagram tersebut,kita sudah membahas pahat potong/pahat alur disini, dan juga pahat bubut dalam disini
Berdasarkan bahan pembuatnya, ada dua macam pahat bubut yang umum dipakai,yakni pahat HSS dan carbide/tungsten carbide.
Pahat High Speed Steel (HSS)
Dalam Bahasa Indonesia bisa jadi baja berkecepatan tinggi. Tapi apa sih sebenarnya HSS itu? Menurut Wiki,
Jadi HSS bukan hanya digunakan memotong besi,tapi juga kayu , bahkan bagus juga untuk pisau dapur. Selengkapnya bisa dilihat di wikipedia.High speed steel (HSS or HS) is a subset of tool steels, usually used in tool bits and cutting tools. It is often used in power saw blades and drill bits. It is superior to the older high carbon steel tools used extensively through the 1940s in that it can withstand higher temperatures without losing its temper (hardness). This property allows HSS to cut faster than high carbon steel, hence the name high speed steel. At room temperature, in their generally recommended heat treatment, HSS grades generally display high hardness (above HRC60) and a high abrasion resistance (generally linked to tungsten content often used in HSS) compared to common carbon and tool steels.The main use of high speed steels continues to be in the manufacture of various cutting tools: drills, taps, milling cutters, tool bits, gear cutters, saw blades, etc., although usage for punches and dies is increasing.High speed steels also found a market in fine hand tools where their relatively good toughness at high hardness, coupled with high abrasion resistance and fine, made them suitable for low speed applications requiring a durable keen (sharp) edge, such as files, chisels, hand plane blades, and high quality kitchen, pocket knives, and swords.
Pahat HSS |
Pahat Carbide
Menurut Wiki lagi....
Tungsten carbide (WC) is an inorganic chemical compound containing equal parts of tungsten and carbon atoms. Colloquially, tungsten carbide is often simply called carbide. In its most basic form, it is a fine gray powder, but it can be pressed and formed into shapes for use in industrial machinery, tools, abrasives, as well as jewelry. Tungsten carbide is approximately three times stiffer than steel, with a Young's modulus of approximately 550 GPa, and is much denser than steel or titanium. It is comparable with corundum (α-Al2O3) or sapphire in hardness and can only be polished and finished with abrasives of superior hardness such as silicon carbide, cubic boron nitride and diamond amongst others, in the form of powder, wheels, and compounds.Jadi Jenis pahat ini dibuat dengan campuran bahan kimia antara lain tungsten dan karbon,tergantung sifat bahan yang dikehendaki. Kadang juga memakai methanol,hydrofluoric acid/nitric acid (HF/HNO3),dll. Rumit sangat....... :D
Bisa juga lihat cara membuatnya disini.
Tungsten carbide bit ini kemudian dicetak dengan beragam bentuk pahat bubut. Ada yang dibuat dengan lubang di tengahnya untuk baut pengunci ke holder/pegangannya,sepert gambar di bawah ini.
pahat tungsten carbide dan holdernya dijual juga di indonetwork |
Namun yang banyak dan gampang dijumpai dipasaran disini adalah yang tidak memakai holder sehingga dalam aplikasinya kita mengelas bit ini ke tangkainya dengan kawat kuningan.
pahat carbide yang dilas dgn gagang |
pahat tungsten carbide dengan gagang di las,dijual di www.axminster.co.uk/ |
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