Design a gear system to drive 4 drill bits depicted above, calculate:
-Appropriate shaft speeds for each bit based on surface speed
-Rate that the bits advance into the metal based on the most restricting of the bits in (in/min)
-Find the actual feed rate of the remaining 3 bits in (in/rev) based on the above
-Total Power required
-AGMA bending and contact stresses between the motor gear and any gear it mates to
Assume: Submit:
-Surface (cutting) speed = 300ft/min -All calculations
-Motor speed = 12,000 RPM -Schematic of the gear layout
-Standard 2 flute twist -Description of each gear
-Base material 6061-T6 -Attach copies of gear catalog pages containing your selected gears
| Drill |
Size |
Feed Rate(in/rev) |
Torque req. (in*lbf) |
| A |
2.000in |
0.015-0.025 |
137.52 |
| B |
1.500in |
0.02 |
81.95 |
| C |
0.250in |
0.005 |
3.24 |
| D |
#13 |
0.004 |
1.9 |