3200984
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 |
| 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 inch -----13 UNC tape | formula TDS = D - 1/N 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. |
| 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. |
| 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 - permist 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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