Millwright Machine Theory 1 - Unit 2 || 100% Errorless
Answers.
28. Which variable is the most important when determining spindle speed? correct answers
diameter of the drill
29. Any machined surface on a drill press that could rust must be? correct answers kept clean
and oiled
30. When installing a taper shank drill into the spindle bore you must take several
precautions, what are they and why? correct answers insure that the drill taper and the bore
are both clean, wipe them with a rag, be careful not to scrape or mark the internal taper of the
spindle bore, any burns in the taper throw your drill bit off center and prevent a tight fit for
the drill
31. Cutting speed refers to? correct answers peripheral speed
32. How fast should a 1⁄2 inch drill turn when drilling mild steel if the cutting speed is
90sfpm? correct answers 720rpm
33. Small drills require a higher feed per revolution than larger ones? T or F correct answers
False
34. Which abbreviation is used to express the feed rate on a drill press? correct answers ipr
35. A drill press spindle has a #2 Morse taper. A twist drill with a #3 Morse taper shank must
be mounted in the spindle. How should you secure the drill in the spindle? correct answers
Use a drill socket
36. To remove a tapered shank twist drill from the drill press spindle use a? correct answers
drill drift
37. When using a sensitive drill press, what should you do as the drill breaks through the
workpiece? correct answers ease up on the pressure
38. The included point angle of a countersunk hole for most flathead screws is? correct
answers 82 degrees
39. Which type of machine tap pushes the chip out ahead of the tap? correct answers spiral
point (gun) tap
40. The lip relief (clearance) angle on a drill should be? correct answers 8 degrees - 12
degrees
41. A general-purpose drill bit for drilling most metals has an included point angle of? correct
answers 118 degrees
42. The hand drill is quicker and more versatile than any drill press for? correct answers
drilling small not vertical holes
, 43. Electric hand drills are limited by? correct answers the amount of feed pressure and rpm
that can apply to larger diameter drills
44. If a milling machine is shut down for repair, what do you do? correct answers lock out the
main breaker box
45. Why is pressurized air not a good method of removing metal chips from hard to reach
places on milling machines? correct answers hot chips can cause serious burns and infections
and can get caught in the spindle taper and get caught in the slides
46. What makes a universal horizontal milling machine different from a plain horizontal
milling machine? correct answers the universal machines table can swivel
47. When would you tighten the backlash eliminator? correct answers before climb milling
48. As a general rule, the maximum depth of cut for an end mill is equal to? correct answers
half the diameter of the end mill
49. You can use V-blocks on a milling machine? T or F correct answers True
50. The purpose of the overarm is to support the ____, which in turn supports the ____.
correct answers arbor supports, free end of the arbor
51. What controls the feed rate on a milling machine? correct answers a gear box located in
the knee and saddle
52. What is the taper per foot used on milling machine spindles? correct answers 3 and a half
in per foot
53. What draws the arbor or collet chuck into the spindle of the milling maching? correct
answers the drawbolt
54. Which vise is the most rigid vise for a milling machine and why? correct answers the
plain vise, because the swivel base vise holds the work higher above the table and the
universal vise holds it even higher
55. What is a shim used for on a milling machine? correct answers to fill the gap under the
work piece
56. What is the main purpose of stop blocks? correct answers to keep the work piece from
shifting under heavy cutting pressures
57. The ____ is the amount of metal removed by each tooth per revolution? correct answers
chip load
58. Determine the feed rate if a milking machine spindle has a speed of 200 rpm and the
cutter has 6 cutting edges with a chip load of .003? correct answers 3.6in per minute
Answers.
28. Which variable is the most important when determining spindle speed? correct answers
diameter of the drill
29. Any machined surface on a drill press that could rust must be? correct answers kept clean
and oiled
30. When installing a taper shank drill into the spindle bore you must take several
precautions, what are they and why? correct answers insure that the drill taper and the bore
are both clean, wipe them with a rag, be careful not to scrape or mark the internal taper of the
spindle bore, any burns in the taper throw your drill bit off center and prevent a tight fit for
the drill
31. Cutting speed refers to? correct answers peripheral speed
32. How fast should a 1⁄2 inch drill turn when drilling mild steel if the cutting speed is
90sfpm? correct answers 720rpm
33. Small drills require a higher feed per revolution than larger ones? T or F correct answers
False
34. Which abbreviation is used to express the feed rate on a drill press? correct answers ipr
35. A drill press spindle has a #2 Morse taper. A twist drill with a #3 Morse taper shank must
be mounted in the spindle. How should you secure the drill in the spindle? correct answers
Use a drill socket
36. To remove a tapered shank twist drill from the drill press spindle use a? correct answers
drill drift
37. When using a sensitive drill press, what should you do as the drill breaks through the
workpiece? correct answers ease up on the pressure
38. The included point angle of a countersunk hole for most flathead screws is? correct
answers 82 degrees
39. Which type of machine tap pushes the chip out ahead of the tap? correct answers spiral
point (gun) tap
40. The lip relief (clearance) angle on a drill should be? correct answers 8 degrees - 12
degrees
41. A general-purpose drill bit for drilling most metals has an included point angle of? correct
answers 118 degrees
42. The hand drill is quicker and more versatile than any drill press for? correct answers
drilling small not vertical holes
, 43. Electric hand drills are limited by? correct answers the amount of feed pressure and rpm
that can apply to larger diameter drills
44. If a milling machine is shut down for repair, what do you do? correct answers lock out the
main breaker box
45. Why is pressurized air not a good method of removing metal chips from hard to reach
places on milling machines? correct answers hot chips can cause serious burns and infections
and can get caught in the spindle taper and get caught in the slides
46. What makes a universal horizontal milling machine different from a plain horizontal
milling machine? correct answers the universal machines table can swivel
47. When would you tighten the backlash eliminator? correct answers before climb milling
48. As a general rule, the maximum depth of cut for an end mill is equal to? correct answers
half the diameter of the end mill
49. You can use V-blocks on a milling machine? T or F correct answers True
50. The purpose of the overarm is to support the ____, which in turn supports the ____.
correct answers arbor supports, free end of the arbor
51. What controls the feed rate on a milling machine? correct answers a gear box located in
the knee and saddle
52. What is the taper per foot used on milling machine spindles? correct answers 3 and a half
in per foot
53. What draws the arbor or collet chuck into the spindle of the milling maching? correct
answers the drawbolt
54. Which vise is the most rigid vise for a milling machine and why? correct answers the
plain vise, because the swivel base vise holds the work higher above the table and the
universal vise holds it even higher
55. What is a shim used for on a milling machine? correct answers to fill the gap under the
work piece
56. What is the main purpose of stop blocks? correct answers to keep the work piece from
shifting under heavy cutting pressures
57. The ____ is the amount of metal removed by each tooth per revolution? correct answers
chip load
58. Determine the feed rate if a milking machine spindle has a speed of 200 rpm and the
cutter has 6 cutting edges with a chip load of .003? correct answers 3.6in per minute
