3199065
Description
Flashcards by Vincent Bergeron, updated more than 1 year ago
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Created by Vincent Bergeron
over 8 years ago
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| Question | Answer |
| Compare the flexible blade and the solid, or all-hard, hacksaw blade. | Solid blades: -hardened throughout and very brittle - used on brass, tool, steel, cast iron, and larger sections of mild steel. -do not run out of line when pressure is applied Flexible blades: -used on channel iron, tubing, copper, and aluminum since they don't break as easily on material with thin cross sections. |
| What pitch hacksaw blade should be selected to cut tool steel? | 18 teeth |
| What pitch hacksaw should be selected to cut thin wall tubing? | 32 teeth |
| What pitch hacksaw blade should be selected to cut angle iron and copper? | 24 teeth |
| What procedure is recommended is a saw blade breaks or becomes dull in a partially finished cut? | - Replace the blade and rotate the work one half turn so that the old cut is at the bottom. A new blade will bind in an old cut and the set of the new teeth will be ruined quickly. |
| Describe and state the purpose of single-cut files. | Single cut files: -single row or parallel teeth running diagonally across the face -include mill, long-angle lathe, and saw files -used when a smooth finish is desired, or for hard materials |
| Describe and state the purpose of Double-cut files. | -have two intersecting rows of teeth: first row is coarser and called the overcut, other row is called the upcut -hundreds of cutting teeth provide for fast removal of metal and clearing chips |
| Name the most commonly used degrees of coarseness in which files are manufactured. | Most commonly used are the bastard, second cut, and smooth |
| List four important aspects of file care. | -do not store files where they will rub together -Never use a file as a pry or a hammer, can cause eye injury -Do not knock a file on a vise or other metallic object to clean it. Use file cards. -Apply pressure only on the forward stroke when filing. Pressure on the return stroke will dull it. -Do not press too hard on new file |
| How can pinning of a file be kept to a minimum? | -Too much pressure results in pinning, which causes scratches. Keep file clean and push brass, copper or wood through the teeth to remove pins -Applying chalk to face of the file will lessen the pinning |
| Describe and state the purpose of long-angle lathe files. | -used for filing on a lathe because they provide better shearing action than mill files. -Long angle of the teeth helps clean the file, eliminates chatter, and reduces possibility pf tearing the metal |
| Describe and state the purpose of Aluminium files. | -designed for soft, ductile metals -modified teeth reduces clogging -upcut tooth is deep and overcut is fine |
| Describe and state the purpose of shear tooth files. | -combine a long angle and a single-cut coarse tooth for filing materials such as brass, aluminium, copper plastics, and hard rubber |
| Describe and state the purpose of Swiss pattern files. | -small files with fine tooth cuts -used in tool and die shops |
| Describe and state the purpose of Die sinker rifflers. | -curved up at the ends to permit filing the bottom surface of a die cavity |
| Compare rotary files and ground burrs. | Rotary files: cut and form broken lines, dissipate the the heat of friction, good for tough die steels, forgings, and scaly surfaces Ground burrs: made of high speed steel or carbide, uniform flutes, used for non-ferrous metals such as aluminium, brass, magnesium, since better chip clearance. |
| List three important considerations in the rotary files or ground burrs. | -Move file or burr at even rate to produce a smooth surface. Uneven pressure makes ridges, hollows -Use proper speed as recommended by manufacturer -Use only sharp burrs or files |
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