260
261
263
Connect blade wheel to output shaft
Problem 77 – Produce a linear speed of blade = 375 ft/min Blade speed = perpheral speed of 9.0 in wheel
vt of wheel = Dwnw/12
Input Power: P = 0.25 hp nw = 12 vtw /( Dw) =159.2 rpm
Actual Output Speed: nG = 160.0 rpm
Tooth Form:
Material:
Tooth Form: Same as for pinion
DESIGN OF PLASTIC SPUR GEARS
20 degree full depth
Unfilled Nylon
20 degree full depth
Secondary Input Data – Gear:
Application:
Initial Input Data:
Computed data:
Secondary Input Data – Pinion:
264
DD
265
Summary:
All gears made from SAE 4340:
268
Gear drive for a lift truck
271
Small band saw driven by an electric motor
Problem 80 – One possible design
Actual Output Speed: nG = 266.9 rpm
Gear Ratio: mG = 3.222
Pitch Diameter – Pinion: DP = 1.500 in
Pitch Diameter – Gear: DG = 4.833 in
Center Distance: C = 6.333 in
Pitch Line Speed: vt = 337.7 ft/min
Transmitted Load: Wt = 48.84 lb
Tooth Form:
Lewis Form Factor: Y = 0.521 Table 9-15
Tooth Form: Same as for pinion
20 degree full depth
Secondary Input Data – Gear:
DESIGN OF PLASTIC SPUR GEARS
Application:
Initial Input Data:
Computed data:
Secondary Input Data – Pinion:
20 degree full depth
272
Problem 81 – One possible design
Input Power: P = 0.06 hp
Actual Output Speed: nG = 21.0 rpm
Gear Ratio: mG = 4.188
Tooth Form:
Lewis Form Factor: Y = 0.578 Table 9-15
Safety Factor: SF = 1.25 Ref: Table 9-1 (Ko)
Material:
Tooth Form: Same as for pinion
20 degree stub
Secondary Input Data – Gear:
Initial Input Data:
Computed data:
Secondary Input Data – Pinion:
20 degree stub
Nylon–glass filled
273
Wheels of remote control car-Electric motor drive
Problem 82 – One possible design
Input Power: P = 0.025 hp
Actual Output Speed: nG = 120.4 rpm
Tooth Form:
Lewis Form Factor: Y = 0.54 Table 9-15
Tooth Form: Same as for pinion
Lewis Form Factor: Y = 0.758 Table 9–15
20 degree stub
Secondary Input Data – Gear:
DESIGN OF PLASTIC SPUR GEARS
Application:
Initial Input Data:
Computed data:
Secondary Input Data – Pinion:
20 degree stub
274
Food–chopping machine driven by electric motor
Problem 83 – One possible design
Input Power: P = 0.65 hp
Input Speed: nP = 1560 rpm
Actual Output Speed: nG = 468.0 rpm
Tooth Form:
Lewis Form Factor: Y = 0.521 Table 9-15
Safety Factor: SF = 1.75 Ref: Table 9–1 (Ko)
Material:
Tooth Form: Same as for pinion
20 degree full depth
Secondary Input Data – Gear:
DESIGN OF PLASTIC SPUR GEARS
Application:
Initial Input Data:
Computed data:
Secondary Input Data – Pinion:
20 degree full depth
Nylon-unfilled