325-midterm-solutions-part 1b annotated (2008w)

complete the helical gear calculations.

Complete the helical gear data below.

write why high 1.700 contact stifness and contact ratio is important ??  also about the importance of high mesh and fatiuge faluires ..... if the stifness ratio and conatct ratio

If in a gear design problem, the required hardness of steels per allowable gear bending strength is: HB = 158; while the required hardness of steels per allowable gear contact strength is: HB = 256.  Which material HB hardness will be used for gear material specification?     256     158     120     400

b) Fig. 6 shows the simplest form of an epicyclic gear train. The properties of both pinion and gear are listed in Table 1. The power transmitted is 11 kW at pinion speed of 1200 rev/min. If the module is 4 mm and has a face width of 50 mm, find the contact stress. Assume a normal pressure angle of 20° and full depth teeth. A Fig. 6 B -Arm C Parameter Material Number of Pinion (A) Gear (B) steel Cast iron 22 60 teeth Table 1

Please solve and answer the problem correctly please. Thank you!

In the gear system shown below, the driving gear should rotate at 4 times the speed of the driven gear. The torque applied to the driving gear is a uniform T = 250 [lbfin]. Both gears are to be full disks made from 1060 Normalized steel with a quality factor of Q₂ = 8. Assume 5 × 108 cycles, a safety factor of Sf = 1.5 and a reliability of 95%. Use AGMA standard methodology. a) Find the pitch circle diameter (dp) for the pinion and the number of teeth (N₂). b) Determine the maximum allowable bending stress (all) for the pinion gear. Determine the required face width (F)for the pinion gear, d) Determine the face width (F) required based on surface contact stress analysis. What is the final face width chosen for the gear system? Driven dy d₂ Driving d = 8 in. Ng = 64 teeth Pitch angle: = 20° 980 rpm

Question 5 a) Calculate the Pitch diameter for the following thread. Given the measurement over the wires is 0.3130. Show your steps. Is the obtained value being acceptable? Why. b) Why the Pitch Diameter is important. Explain..show schematics Nominal Size, Class Маx Маjor Min Major Max Pitch Diam Min Pitch Diam TPI, Series Diameter Diameter 5/16-18 UNC 2A (Ext) 0.3113 0.3026 0.2752 0.2712

Please answer this ASAP,i need the answer in 45 min,mechanical engineering task,thx The pinion transmits 400 horsepower at 2000 rpm from a wheel single reduction straight gear. The center distance is close to 60 cm with a gear ratio of 10:1. Addendum = m with a pressure angle of 22.5o , normal pressure between teeth = 180 N/mm width. count : the closest module; the number of teeth on each wheel; pinion width

A group of first year students are designing gear reduction system in the Makerspace, consisting of four gears A, B, C and D. The radii of the gears are TA = 1.5 in, r = 3.5 in, rc = 2.0 in and r₁= 5.0 in. Gear A rotates clockwise with a constant angular velocity WA = 440 rpm. Gears B and C are rotating together on the same shaft. Determine: @A A B rc C D TA TB "D (a) the angular velocities of gears B and D, (b) the accelerations of the contact point on gear B and contact point on gear D.

Please show your detailed and correct solution to this problem. ASAP! Thank you!