zielsicher Englisch, Metalltechnik, Schulbuch

Listen to the conversation about filing and choose the correct options. Milled files Cut files positive chip angle negative chip angle soft materials hard materials aluminium synthetic materials steel, grey cast iron large chip holes small chip holes wedge shaped teeth Then draw a sketch of a milled file and a cut file. Read the text about twist drills and a column-type drilling machine. Underline the parts of a twist drill and a column-type drilling machine in one colour and the different materials in another colour. Then discuss your results with a partner. The most common drilling tool is the twist drill. The material is usually high speed steel (HSS), but it can also be hard metal tipped. Twist drills can have a parallel shank for a diameter up to 13 mm or a taper shank with a diameter of more than 13 mm. There are three types of twist drills: •• for soft steel, grey cast iron and stainless steel •• for hard materials such as high strength steel, laminated plastic •• for soft materials such as aluminium-, copper- and zinc-alloy. The most common drilling machine is the column-type drilling machine. This machine has a movable and adjustable worktable for the work piece: It is important: to place the work piece in the chucking device, to wear safety goggles and not to wear any gloves. 05 A2–B1 listening n5h4uz ✗ ✗ ✗ ✗ ✗ ✗ ✗ ✗ ✗ ✗ ✗ 06 A2–B1 unterstrichen = materials unterwellt = parts Word bank 05 chip Span discharged abgeführt tooth space Zahnlücke wedge shaped keilförmig forged geschmiedet chip angle Spanwinkel grey cast iron Grauguss file handle Feilenheft tang Spitze (Angel) 06 twist drill Spiralbohrer high speed steel (HSS) Schnellarbeitsstahl parallel shank Zylinderschaft taper shank Kegelschaft stainless steel nicht rostender Stahl high strength steel hochfester Stahl laminated plastic Schichtpressstoff column Säule worktable Maschinentisch chucking device Spannvorrichtung γ γ cut file milled file work piece 74 Unit 14 Nur zu Prüfzwecken – Eigentum des Verlags öbv