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"Hasil bubutan tirus,misalnya dalam membubut lurus sepanjang 500mm antara ujung satu dengan lainnya ada perbedaan 1mm...."Tiga penyebab utama mesin bubut menghasilkan pemotongan yang tidak lurus adalah
bedways atau lintasan,salah satu bagian yang paling sering mengalami keausan,karenanya pelumasan adalah wajib
"Hasil bubutan seperti oval. Ketika diukur dengan posisi berbeda 90 derajat ada selisih besar diameternya. Terjadi baik kala membubut luar maupun membubut diameter dalam(lubang)......"Hal ini biasanya dikarenakan karena bearing-bearing pada spindel utama atau poros mesin bubut sudah aus/gocak/longgar. Memang untuk menggantinya membutuhkan waktu cukup banyak,mengingat kita harus membongkar headstock sebaiknya juga memeriksa baring-bearing pada sumbu transmisi.
spindle bearing |
"Gerakan maju saat membubut ulir/drat seperti putus-putus. Kadang tuas otomatis ulir (pembawa) lepas hingga hasil bubutan jadi rusak...."Hal ini biasanya terjadi karena mur belah,yang digerakkan oleh tuas tersebut sudah aus atau kotor oleh gram. lakukan pembersihan dan penyetelan. Tapi yang lebih umum justru poros ulirnya yang aus duluan. Biasanya bisa dibalik posisinya,bagian yang masih bagus ditaruh di depan. Tentu akan ada sedikit penyesuaian.
"half nut" mur dalam tuas otomatis drat |
pemakaian center putar |
seter pipa |
chuck bor |
pemakaian chuck bor |
collet chuck |
adaptor atau sarung |
steady rest atau penyangga tetap |
|
follow rest atau penyangga berjalan |
roundbar stainless steel |
roundbar besi |
macam-macam bentuk pahat bubut *gambar dari McMaster-Carr catalogue |
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 |
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
pahat tungsten carbide dan holdernya dijual juga di indonetwork |
pahat carbide yang dilas dgn gagang |