zielsicher Englisch, Metalltechnik, Schulbuch

Read the text about countersinking and reaming . First, label the pictures, then match the sentence parts. Countersinking and reaming as well as drilling are cutting opera- tions with a circular cutting movement. The tool makes an axial feed motion towards the axis of rotation. The interaction of both these movements is, in effect, a process of metal cutting. Countersinking is a machining operation related to drilling. In order to achieve smooth surfaces, low cutting speeds and slow feeds are required. Such applications range from deburring to taper countersinking and cylindrical countersinking. Reaming improves the surface quality of a drilled hole, as well as the dimensional and the geometrical accuracy (roundness of the drilled hole). There are machine chucking reamers and hand reamers. The direction of rotation of the reamers always has to be a clockwise rotation. 1. 2. 3. 4. 5. Countersinking is related to a Reaming improves the surface quality There are machine chucking reamers Application ranges of counter- sinking are The direction of rotation of the reamers A B C D E and hand reamers. always has to be in a clockwise direction. drilling operation. of a drilled hole. deburring, taper and cylindrical countersinking. Circular saw, jigsaw, handsaw or bandsaw? Label the pictures. Then match the sentence parts. Handsäge Kreissäge Bandsäge Stichsäge handsaw circular saw bandsaw jigsaw 1. 2. 3. 4. 5. Saws Soft materials being worked on Depending on the thickness of the material and hardness of the work piece Hard materials being worked on Saw blades are made of A B C D E the saw blade must have an appropriate tooth division. need a fine tooth division. tool steel alloys, high-speed steels, sintered materials and saw blades with hard metal tips. need a rough tooth division. are for separating and carving. 03 A2–B1 Word bank circular kreisförmig axial feed motion axiale Vorschub­ bewegung axis of rotation Drehachse smooth glätten, glatt surface Oberfläche deburring Entgraten taper countersinking Kegel Ansenken cylindrical countersinking zylindrisches Einsenken drilled hole Bohrung machine chucking reamers Maschinen­ reibahlen hand reamers Handreibahlen clockwise im Uhrzeigersinn countersinking reaming 04 A2 Word bank saw blade Sägeblatt tooth division Zahnteilung alloy Legierung hard metal tip mit Hartmetall bestückt separating Trennen carving Einschneiden 73 Cutting operations with machines and by hand 14 Nur zu Prüfzwecken – Eigentum des Verlags öbv