Mechanical System Design

5.250

6.750

1.750 4.000

A B

C D

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 2.000 in. 0.015-0.025 137.52 B 1.500 in. 0.020 81.95 C 0.250 in. 0.005 3.24 D #13 0.004 1.90

2 1

A

B

2 1

B

A

WEIGHT:

drill project SHEET 1 OF 1

REV.

A DWG. NO.SIZE

SCALE:2:3