Gear Definition and 386 Threads

I looking for help on a problem I am trying to solve here at work. I am not an ME, so my mechanics knowledge is low. This isn't helped by the fact that my mechanics class was 13 years ago. I have a label applicator that is not geared correctly, so it runs slower than the wrapper that it is...

Hi I hope someone can help. I am working on a gear train with an electric motor which was burnt out and I'm trying to find the ratio and gear size without haveing to use a cutting torch to cut it up to get it out where I can work on it to measure the gear size. the gear on the motor (a) spins...

I have a picture of two gears, but I need some help with mechanical advantage. Let's say the larger gear is providing the work, and if there was no load supplied to the smaller gear, the large gear be spinning at 1,000 rpm, which would make the small gear spin at 3,000 rpm since the gear ratio...

I am trying to lift a load with a drill motor. I have a chain drive with a 3.7x1 ratio - 13 teeth on the drive gear with a 2.5" diameter and 48 teeth on the driven gear with a 7.75" diameter. It lifts the load easily. I also have a geared drive (no chain) with a 4.0x1 ratio - 16 teeth on...

First of all, I am a newly registered user, so thanks for any help guys. I am confused with the concept of planetary gears. Let's say there is an rpm applied to a planetary gear of 600 rpm and the gear ratio is 3:1. So the output of the planetary gear then spins 1800 rpm (600 * 3). Now my...

Dear guys I need assistance regarding optimization problem. I have to minimize the power loss in worm gear drive system. I have formulated minimization function,and constraints,how to solve the function and find design vectors. ANy suggestions,sites,ref.welcome Thank u Prakash

Note - pi is not meant to be an exponent, not sure why it looks like one... Homework Statement The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed...

hi.. i want to make a automatic gear changing bicycle in which instead of manual changing of gears they change automatically with variation of speed... for this project i need help..if you know any thing about this then please reply...by posting

I am hoping that someone on here can give me some insight on what caused this. I have my idea; however, I would like someone to give their opinion also. At work we have a 13000 volt motor that powers our compressor. How frequent can that size motor be started without causing the motor to...

Dear all Anybody define,what is exactly gear windage loss? Text books defined that loss due to lubricants etc...vague Thanking u Prakash

Mcmaster carr's gears are a bit too wide for my design. I need a pair of gears to have a ratio of .31, that is around .7" to 2.38" The widths for the gears can not be any larger than .5" and ideally even less, at Mcmaster Carr they are about 1" Have to be made of steel. Cannot be any...

I would like to take a line of rope and slow it down to a stop in a relative short period of time using a gear mechanism that would activate when touched to the reel wheel. Any suggestions on something that may already be out there or perhaps the easiest way to go about doing this? Thank you for...

Hi , Please I need some help here. I’m working on a project .I have to design 3 gear assemblies which run a switchgear inside an enclosure. Here I attach 3 drawings and a picture for the gears. I have to do my calculations and select the specification (diameter, lengthy, cross section...

Homework Statement http://img8.imageshack.us/img8/2393/geartain.jpg The Attempt at a Solution I got the right answer, by assuming that \omega_3=\omega_6 , but i don't know why this has to be so. Here's my working: \frac{\omega_2-\omega_3}{\omega_4-\omega_3}=-\frac{N_4}{N_2}...

For one of my classes, I have to design a gearbox. i am currently going through some calculations, but before I get too far in, I would like to know where one can find a list/catalog of readily available gear sizes/pitches. The gearbox clearly has to satisfy certain load carrying parameters...

I am a cyclist and am starting to think about gear ratios. I have counted teeth on my bike gears (touring) and calculated ratios and the results do not make sense to me. I am left with the beliefe that ratio is not all at work here. It seems that it also has to do with the diameter of the gear...

Hi everyone. I wonder how to obtain , let say a 20T gear connect to a 40T gear compare to a 40T connect to 60T gear. (teeth size is the same) Suppose the transmitted force (at the outer of the gear) is the same, is there any different froce on the teethes in each pair (larger no. of gear...

Hi, I know basics of gear design but have never designed a gear before. I want to know, while designing a spur gear what is defined first 1] Pitch Circle or 2] Base Circle ? In case. if base circle is defined first, then how to determine its diameter ? Lot of design materials...

I know that the idealized problem using gears and force without considering biophysics will tell me there is basically no difference in energy between riding a bike up a hill in low or high gear. I have often wondered which actually uses more calories. Many people tend to go to a lower gear...

Compound gear train problem (WHY IS IT SO HARD!) Homework Statement http://img5.imageshack.us/img5/1663/problemw.jpg I need to calculate the angular acceleration of the fan at 2600 RPM (motor speed) depicted by figure 4. Homework Equations Sum(torques with respect to input) =...

i have to design a double reduction gear drive using a spur gear pair.Input RPM is 730 and output RPM is 85.7. s The pinion teeth are 18 and the module is 3. The problem is that the input torque is 144Nm due to which i am getting a very high tangential velocity (Ft) which results in a higher...

I'm trying to determine the forces that an internal gear applies on a pinion. I can measure the angular velocity of the gear and any relevant dimensions but can only find force equations for gears with a single point of contact. Any guidance is greatly appreciated.

I was not sure where to put this since it is both engineering and math so feel free to move it but to the point I have a few small engines I am going to use on a project and I need to convert the rpm to mph though to do that I need to know the Gear ratio and do not know what that is without...

Hi all. I'm attending a gear design seminar next week and would like to brush up on my gear knowledge. I'm looking for some resources a little more in depth than the 30 pages in my machine design textbook. If anyone has some good links or anything I would sure appreciate it. Thanks,

I really don't know much about it so please go in depth

Im working on a gear design project and have chosen 25 Horsepower, 1750 RPM;s for the pinion, and a gear ration of 3. My question is how do I find out the number of teeth for each gear? I know the formula M_g = Ng/Np = ng/np which allowed me to calculate the output RPM;s of the gear...

I'm having a bit of difficulty figuring out the theoretical efficiency of a compound epicyclic gear train. The math involved is a bit over my head. This train is meant to run at very slow speed under light load. I want to find the theoretical efficiency of the design so I can determine if it is...

Hey guys, I'm a student currently studying for a higher degree in mechanical engineering. I am undertaking a project focusing on the landing gear of a typical boeing 747 (400). I plan to do a finite element analysis on the landing structures. My query is would it be possible to find a...

Hey guys, I am trying to determine which gear ratio is best to use for my project. We have 2 cars attached by rope, and whichever pulls the other one on its side, that car wins. We are given a motor with the following specs: rpm@torque=3500 rpm stall torque=0.61Nm So I was wondering...

What will be the torque in a gear system after the motor get off. If so wat time it will take to stop. For example say if a motor is operating at a torque of 0.075Nm with 6000 rpm and the output gear rotate with a torque of 25Nm with 18 rpm. After some time motor is not experiencing any...

Hi Guys, Can anybody advise me where to get chart for tolerance class of 11e28 and 10e28 for the plastic Gears?

I am using a gear mechanism in one of the toys that i am making for my baby. but the gear makes a lot of noise. Will replacing it with Roller drive or friction drive reduce the noise? Is there any other way to reduce noise from gear drive?

I am trying to design a gearbox for a project i have. I have calculated a fair few things about what i want to get from the gearbox, but now i have came to design the gear box i have got bogged down with all the various things, so help please if you can. Data is Input:7850 rpm Output...

In a two stage reduction gearbox is it possible to have more teeth on the gear pair (helical-parallel axis) of the 2nd stage? I ran through a specification for gear sizes and I am wondering if this is ok.

1. This is a question that I've asked a few people and have not been able to get a solid explanation to: The crankshaft gear (A) has 14 teeth. It drives gear (B) with 21 teeth which is on a shaft & on the other end of the shaft is gear (C) with 9 teeth. The distributor is driven off gear (C)...

Hi I have to design a gearbox for a drum, the drum should be brought uniformily to a speed of 7rpm in 8 seconds, I have choosed a motor of 715 rpm output, what's the gear ratio I should use in designing the gearbox? Thanks

Sorry if the title is a bit blunt, but it's basically like this. There's this machine I'm working with. It's kinda using Gear + Chain to drive the output. Initially, they were all driven by gears but the gear is spoil every 2 months. So then it was changed to chain instead but now the...

A Quantas airplane flying between Sydney and Melbourne yesterday had to turn around and return because a "faulty landing gear" light came on. Why turn around? You got to land either way.

Hello, I was wondering what kind of reliability tests I could do with landing gears. The one we are working with, is a conventional, trail dragger. Right now, we are building a model and later on the full size. But we are focusing on reliability and I'd like to know good methods so that I...

When searching through a catalog for gear drive reducers, I find that many of them list nominal output torque and nominal input speed. My question is what does the term 'nominal' in that context mean. If it lists nominal output torque of 3186in.lb, and nominal input speed of 2900rpm, does...

So you are offered a certain product that is much cheaper than in the shops, the tax sort of wasnt paid at customs, would you buy any?

The jolt that you feel when you press on the gas when in 1st gear...would you feel that same jolt in 5th gear if there was no air resistance?

Hi all, I am confused of how to find the “TOTAL TOOTH-TO-TOOTH SPACING AND PROFILE ERRORS e”. My Professor want me to determine the ERRORS of a Spur Gear with gear diameter d1 = 420 mm and pinion diameter d2 = 65 mm and a gear module m = 8 and the AGMA Quality is No. 10. When I see the...

Design the shaft assembly of gear 2 with the following information: Gear: The specification of the involute helical gears are as follows Pressure angle: 20 degrees Torque acting on gear 1, T1= 95500Nmm Number of teeth: N1= 55(gear1), N2=135(gear 2) Helix angle= 15 degrees Tooth Width b=...

Hi I am doing a physics coursework presentation, and i need to calculate the stress in the landing gear of an aircraft. It can be any aircraft I just need some figures, for instance the force on the landing gear as it lands, and the cross-sectional area of the landing gear. The formula for...

I am working on a mechanical model for a Snowmobile and trying to figure out what the differential equations becomes when you have a CVT (Continuous Variable Transmission) instead of a Gear Box. Assume that you have two shafts connected with each another through a (lossless) and stiff gear box...

Homework Statement Hai Friends, i want to know the complete the dimension of bevel gear front teeth width and end teeth width. How this dimension are related with emperical formulas please give me complete detailing of bevel gear far straight and spiral also...

Suppose that it was possible to construct gears smaller than ones of modern ten speed bicycles(nano gears) and suppose your chain or belt could turn them and withstand the friction. First gear of course would be the same as a modern ten speed in order to get it moving. If the last gear's radius...

Can someone please brief me what is Gleason and Revacycle profiles and what are the major differences between? Please help me to find some gear profiles, I've some data with me which is actually not matching empirically with Gleason as well as Revacycle profiles. I'm involved into bevel...

I've a gearbox from a 250 cc Honda engine. The pattern in one down and four up. This engine will be integrated into a car, so the changing of gears will be difficult with the foot pedal. wouldn't it ? :) . So i decided to integrate a small motor to the gear shift pedal so that it can change...