3562197
Description
Flashcards by Vincent Bergeron, updated more than 1 year ago
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Created by Vincent Bergeron
about 9 years ago
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| Question | Answer |
| The three hand taps found in a set are the: | Taper tap Plug tap Bottoming tap |
| Briefly explain the method of removing a broken tap using a tap extractor. | A wrench is fitted to the extractor and turned counterclockwise to remove a right hand tap. |
| Serial taps of the same nominal size: | have different pitch diameters but the same pitch. they are used to tap difficult material and used in sets of 3 taps increasing in size. 1 is the smallest diameter 2 has a larger diameter than 1 3 is the finished diameter |
| You have to choose between four steel rods to cut a 1/2-13 UNC 2A thread with an adjustable split die. Which diameter rod would you use? | 0.497" undersize to allow for clearance in the tapped hole |
| A die is turned with a: | die stock |
| The purpose of draw filing is to: | produce a smooth flat surface |
| The most suitable chisel for cutting oil grooves is the: | round nosed chisel |
| All-hard hacksaw blades are used on: | large pieces of brass |
| The length of the taper on the end of a hand reamer: | roughly the same as the reamer's cutting diameter |
| The cutting action of a hand broach is performed by a series of successive teeth, each protruding: | 0.003" further out than the tooth in front of it |
| Hand reamers must be rotated: | in a clockwise rotation |
| The width of the saw blade cut in the workpiece is called: | kerf |
| The reason for the crown on the end of a flat scraper: | so the outside edges don't dig into the finished piece |
| In the lapping process, which is charged: | the lap is charged with lapping compound |
| What is the tap drill size for a 3/4-10 UNC 2B | diameter-pitch 0.75-(1/10)=0.65 21/32" (0.6563) |
| Describe the the solid, or all-hard, hacksaw blade: | -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 |
| Describe the flexible hacksaw blade: | -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 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 |
| Name, describe, and state the purpose of the three taps in a set | Taper tap - tapered from the end. used to start a thread easily. used to tap a hole that goes through the work. Plug tap - tapered for approx 3 threads. Bottoming tap - not tapered but chamfered at the end for one thread. When tapping a blind hole use a tapered tap them a bottoming tap. |
| Define tap drill size | The drill size that will leave the proper amount on material in the hole for a tap to cut a thread. |
| Use the formula and calculate the tap drill size for: 1/2"-13 UNC tap | formula TDS = D - 1/TPI 0.5-(1/13)=0.423" |
| Use the formula and calculate the tap drill size for: M 42 - 4.5 mm tap | Formula TDS = D - Pitch 42mm - 4.5mm = 37.5mm |
| Why should care be used when a hole is being tapped? | Because a tap is hard and brittle and can break easily. |
| Explain the procedure for correcting a tap that has not started squarely. | Remove the tap from the hole and restart by applying pressure in the direction from which the tap leans. |
| Briefly outline the procedure for tapping a blind hole. | Use all three taps in order. Taper, plug, then bottoming. |
| For what purpose are threading dies used? | used to cut external threads. |
| State the purpose of the adjustable split die and the solid die. | solid die - used for chasing or recutting damaged threads. adjustable split die - permits adjustment over or under the standard depth of thread. |
| Explain the procedure for starting a die on the work | - chamfer the end of workpiece - lubricate tapered end of die - place tapered end of die on workpiece - press down and tirn clockwise several turns - check if it has started squarely - turn die forward one turn and reverse approx one half to beak the chip - apply cutting fluid frequently |
| What procedure should be followed when it is necessary to cut a thread to a shoulder? | remove the die and restart with the tapered side of the die facing up |
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