Gear Definition and 402 Threads

I am working on a vehicle based computer game. The focus right now is to get the internal physics of each drive line component as physically correct as possible. Since a few weeks, I am stuck with a problem that I cannot get past by myself. I have narrowed it down to a specific issue. It should...

gear pump cavi ? well dear all we know that gear pump is a positive desplacement pump which has constant dioscharge at different loads my problem is i need an explanation to this sitiuation " from 1 month at my work i found a breakdown of lubricating pump used to pump oil on a bearing it...

Suppose we've got the setup as shown in the figure (see attachment). The idea is that the motor transfers its speed and force (rotary) to the actuator force and speed (linear) via some gears and a spindle. Here: R = radius [m] J = inertia [kg m^2] n = rotary to linear transmission [---]...

A few weeks ago, I decided to challenge myself, and design a wooden pendulum clock. It's been loads of fun, especially the hard parts. One such hard part prompted me to make this thread. Here is the problem: Like any regular clock, The hour, minute and second hands are on the same axis...

is there such thing as a gear that when laid horizontally has teeth that point up intead of out or in?

i have a 20:1 worm gear but would like to lower the ratio as much as possible. what can i do to lower the ratio? the lower the better

Can a worm gear that's attached to a helical gear (so that the helical gear is locked, but the worm gear isn't) go backwards and forwards?

What's an easy way to lock a spur gear in place?

Hi, I'm new to the site so I hope I'm in the right place, I have a question regarding gears for a project that I am working on at uni. I'm designing a building which has a steam driven turbine at the base, what I want to have is levels above which are attached to the same axle as the turbine...

Hi Guys, I have been scouring books and the internet for a while as well as my university notes but I really can't find any information on why a roller can be used as a replacement for a gear. The situation is that I have to design a test rig to simulate two gears running together to...

Hi, I am new to this forum so forgive if i am mis posting or multi posting. I am in the process of designing a 44 inch gear to cut on my shop bot cnc machine. I have been up and down calculations but i end up with tiny teeth and can not find the right formulae to calculate an oversize spur gear...

Hi, I have a DC motor with 4mm diameter shaft, flat tip. How can I attach a 12 teeth pinion to this drive shaft?. I have been loking for pinions and gears on the web but they don't specify how are they attached to a shaft, as there are round shafts and flat tip shafts. Do I have to ask for...

Does anybody else love science fiction? Does it involve bipedal machines? Did you really like all of the Metal Gear Solid games? I ditto all of the above! But one question strikes me (besides asking myself if Hal Emerich scientific lingo actually makes sense) how will we power these...

I'm a bit confused about power output and gear ratios. I think it's best to explain by going by my example (imperical units, sorry Americas & Brits): Mass: 1300kg max. power: 128 kW @ 5500 rpm max. torque: 245 Nm Gear ratios (from a slightly different car type, but should be similar): 1st...

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...

Homework Statement Construct a gear train using at least three idler gears of any tooth size.the driver gear had 15 teeth,Pd of 16 n 4625rpm clockwise.driven gear must able to pull up a weight 18kN with velocity 0.7-1.3 m/s. The gear is made of small n large gear,connected together.the smaller...

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...

Hello, I am working on a personal project that models the movement of pedestrians in large crowds. I am using something called the "social force model" and came across a master's thesis which describes an improved implementation. The model constructs a very large force equation to model the...

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.