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Unit 24, page 180 Review Questions: Thread Cutting Tools and Procedures
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- 1Name, describe, and state the purpose of the three taps in a setTaper 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. - 2Define tap drill sizeThe drill size that will leave the proper amount on material in the hole for a tap to cut a thread.
- 3Use the formula and calculate the tap drill size for: 1/2 inch -----13 UNC tapeformula
TDS = D - 1/N
0.5-(1/13)=0.423" - 4Use the formula and calculate the tap drill size for: M 42 ---4.5 mm tapFormula
TDS = D - Pitch
42mm - 4.5mm = 37.5mm - 5Why should care be used when a hole is being tapped?Because a tap is hard and brittle and can break easily.
- 6Explain 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.
- 7Briefly outline the procedure for tapping a blind hole.Use all three taps in order. Taper, plug, then bottoming.
- 8Briefly 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.
- 9For what purpose are threading dies used?used to cut external threads.
- 10State 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. - 11Explain 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 - 12What 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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- Q&A thread Cutting Tools and Prcedures
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- Vincent Bergeron
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