Term
| 01. When direct indexing: |
|
Definition
| the index crank is not used |
|
|
Term
| 02. The formula for direct indexing eight holes in the circumference of a piece of barstock is: |
|
Definition
|
|
Term
| 03. When milling a square and using the 36 hole plate circle on the direct indexing plate, how many holes are required for the milling of each side? |
|
Definition
|
|
Term
| 04. In order to revolve the spindle one complete revolution on most dividing or indexing heads, the indexing crank must be revolved: |
|
Definition
|
|
Term
| 05. The calculated indexing for cutting 156 teeth on a gear blank is: |
|
Definition
| index=40/N=40/156=10/39=sp/hp |
|
|
Term
| 06. The calculated simple indexing for cutting 25 teeth on a gear blank is: |
|
Definition
| index=40/N=40/25=1 3/5=1 45/75 |
|
|
Term
| 07. To drill 2 holes 105 degrees apart using direct indexing and the 24 hole plate circle, the number of spaces to move is: |
|
Definition
360/24=15 degrees
105/15=7 spaces |
|
|
Term
| 08. When angular indexing, 3 1/2 turns of the index crank will index the work through an angle of: |
|
Definition
index=D/9
D=index*9=3.5*9=31.5 degrees |
|
|
Term
| 09. When differential indexing, for negative rotation using compound gearing you should use one idler (T/F) |
|
Definition
simple differential:
+ --> 1 idler
- --> 2 idlers
Compound differential
+ --> 2 idlers
- --> 1 idler |
|
|
Term
| 10. Using differential indexing, which gear train would be used to index for 175 divisions? Approximate = 160 |
|
Definition
Indexing=40/A
Gearing=(A-N)40/A=(160-175)40/160=-3.75
=72*40/(32*24), 1 idler |
|
|
Term
| 11. Before differential indexing can be accomplished: |
|
Definition
| disengage the lock or stop pin |
|
|
Term
| 12. The milling machine is set to cut a right hand helix, to cut a left hand helix: |
|
Definition
| swivel the table clockwise and add an idler |
|
|
Term
| 13. Using a milling machine with a standard pitch leadscrew, (4tpi) which of the following gear trains would be used to cut a 28-inch lead? (Gears available 24, 28, 32, 40, 44, 48, 64, 72, 86, 100) |
|
Definition
Gearing=Lmc/Lsc=(1/4*40)/28=.357=DR/dn
=24*40/(48*56)=LS/SP |
|
|
Term
| 14. During the linear graduating process, the table and the index head are connected with gears, two turns of the index crank will move the table: |
|
Definition
40turns --> 1rev --> 1/4=.25
2 turns --> 2/40=.05 rev --> .25*.05=.0125" |
|
|
Term
| 15. The calculated indexing required for a linear graduation of .03125 inch is: |
|
Definition
40 --> 1 --> .25
5 <--- .125 <--- .03125 |
|
|
Term
| 16. When linear graduating the table is moved by: |
|
Definition
|
|
Term
| 17. The circular/ radial graduating method would produce ... |
|
Definition
| Vernier protractor scales or radial lines about a circle |
|
|
Term
| 22. If driving gear has 40 teeth and revolves at 300 rpm, and is in mesh with a driven gear having 15 teeth, the rpm of the driven gear would be: |
|
Definition
|
|
Term
| 23. What is the pitch diameter of each gear whose ratio is 2.5:1 and their center distance is 7 inch? |
|
Definition
PDg=Ng/(Ng+Np)*2*CD
4 inch and 10 inch |
|
|
Term
| 24. Three calculations required to mill a helical gear that are not required to produce a spur gears are: |
|
Definition
| helix angle, change gears, lead of helix |
|
|
Term
| 25. To ensure that a helical groove or spline has the same contour as the form cutter: |
|
Definition
| swing the table to the helix angle |
|
|
Term
| 26. Helical gears that connect parallel shafts must have ... hands of helix |
|
Definition
|
|
Term
| 27. Involute milling cutters for cutting helical gears on a milling machine are selected according to Normal Diametral Pitch (T/F) |
|
Definition
|
|
Term
| 28. Helical gears cannot connect: |
|
Definition
|
|
Term
| 29. Helical gears require more horse power to turn than a similar spur gear (T/F) |
|
Definition
|
|
Term
| 30. If the circular pitch of a helical gear with a 25 degrees helix angle is .221" the normal circular pitch will be: |
|
Definition
Cos(helix angle) = DP/NDP=NCP/CP,
NCP=.2 |
|
|
Term
| 31. Which of the following ratios is an example of hunting tooth ratio: |
|
Definition
|
|
Term
| 32. To cut helical gears with crossing shafts on a horizontal milling machine, swing: |
|
Definition
| table clockwise for both gears |
|
|
Term
| 33. When cutting a helical gear: |
|
Definition
| disengage the index plate locking device |
|
|
Term
| 34. To ensure that a worm and worm gear run correctly, the: |
|
Definition
| circular pitch must equal the linear pitch |
|
|
Term
| 35. To find the centre distance of a worm and worm gear: |
|
Definition
| add pitch diameters and divide by two |
|
|
Term
| 36. A worm gear has 50 teeth and a pitch diameter of 3. inch. The linear pitch of the worm: |
|
Definition
Cir = pi*PD = CP*N
LP=CP=pi*PD/N = 3.14*3/50 = .188" |
|
|
Term
| 37. A 4 start worm with a linear pitch of .25" drives a 40 tooth worm gear. If center distance is 2.2". What is lead angle of the worm? |
|
Definition
Tan (lead angle) = Lw/Cir
Cir = pi*PDw = CP*Np
CD=1/2*(PDw+PDg)
PDg=Cir/pi=CP*Ng/pi=3.183
PDw=2CD-PDg=1.217
lead angle = actan(Lw/(pi*PDw)=14.66 degrees |
|
|
Term
| 38. One manufacturing method used to produce worm gears is: |
|
Definition
|
|
Term
| 39. The pressure angle of a 29 degrees worm is |
|
Definition
|
|
Term
| 40. One application for a coarse pitch worm and worm gear is a: |
|
Definition
|
|
Term
| 41. A worm gear has 75 teeth and is driven by a 5 start worm. If the center distance is 4. What is the pitch diameter of the worm? |
|
Definition
| See the formular specify by saying |
|
|
Term
| 42. One application for a fine pitch worm and worm gear is: |
|
Definition
|
|
Term
| 43. If a spur and worm gear have the same DP and number of teeth: |
|
Definition
their pitch diameters will be equal
(PD=N/DP) |
|
|
Term
| 44. When cutting bevel gear teeth, the index head is swung to the: |
|
Definition
|
|
Term
| 45. When blanking out a bevel gear, the most important angle to consider would be: |
|
Definition
|
|
Term
| 46. The chordal thickness of a bevel gear would be measured at the: |
|
Definition
|
|
Term
| 47. Which tooth form is not found on a bevel gear? |
|
Definition
|
|
Term
| 48. Bevel gears with curved teeth can be produced in a: |
|
Definition
|
|
Term
| 49. Bevel gear cutters are: |
|
Definition
| thinner than spur gear cutters |
|
|
