Karteikarten
Hand Cutting Tools
Karten in diesem Stapel (18)
- 1Compare 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. - 2What pitch hacksaw blade should be selected to cut tool steel?18 teeth
- 3What pitch hacksaw should be selected to cut thin wall tubing?32 teeth
- 4What pitch hacksaw blade should be selected to cut angle iron and copper?24 teeth
- 5What 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.
- 6Describe 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 - 7Describe 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 - 8Name the most commonly used degrees of coarseness in which files are manufactured.Most commonly used are the bastard, second cut, and smooth
- 9List 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 - 10How 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 - 11Describe 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 - 12Describe and state the purpose of Aluminium files.-designed for soft, ductile metals
-modified teeth reduces clogging
-upcut tooth is deep and overcut is fine - 13Describe 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
- 14Describe and state the purpose of Swiss pattern files.-small files with fine tooth cuts
-used in tool and die shops - 15Describe and state the purpose of Die sinker rifflers.-curved up at the ends to permit filing the bottom surface of a die cavity
- 16Compare 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. - 17List 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 - 18—
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- Unit 23 Questions and answers
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- Vincent Bergeron
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