Gear Definition and 386 Threads

Hello fellow PF members, This is my first post. I am wondering if there is a mechanism that alters the gear ratio in worm gear-worm wheel setup.. Something like a variable pitch worm gear that can be used instantaneously to alter the gear ratios. If not for worm gear, is there anything in...

Dear Sir, I am trying to understand that whether a Pump who is flowing a High Temperature Fluid (Therminol) will be feasible with a Gear Box. The Gear Box will be used to increase the pump speed from 3000 rpm to 3600 rpm. The reason behind increasing the speed is high Pump TDH and as per...

Hi guys, I have 2 mini motors and a set of worm gear. I would like to know how to build a system that can make use of the torque from both motors at the same time so that I can double the torque without losing speed. thank you

Hi, If I put an 8 tooth on axle A and meshed a 12 tooth on axle B then I put a 16 tooth on axle A and meshed a 20 tooth on axle B but the 16 and 20 have the equivalent angular velocity/tooth profile will it rotate properly or will it jam due to the two gear sets going at different speeds...

What are the factors to take into account when deciding between using a belt or a gear system for transferring power? Thanks

hi all. i have an assignment to design a gear system. so, anyone can suggest me a software that i can make a simulation about a gear? prefer simple software that got a lot of function. thank~~ Edit: i tried this software http://gears-simulator.software.informer.com/3.0/ but i need a function to...

Dear Experts A bicycle has the following gear setup. I like to get your advice what is the effective gearing and torque at the rear wheel that is being turned by a electric motor that is turning the whole gear set using a chain. There are 2 gear sizes : small gear and large gear. Their...

Hi, When I discuss about gears NVH, the term contact stiffness(Cɣ) comes across very often. It is given with a nominal mean value with its upper and lower fluctuation. I can thus understand that the stiffness varies from the start of mesh till end of mesh reaching the mean value at it's pitch...

http://C:\Documents and Settings\design3\Desktop\piccs Hey, I want to know how to calculate the gear ratio of the given arrangement in the picture. I am not sure of how to calculate the gear ratio of two gears on the same shaft. Also the input gear is helical and the output gear is a spur...

Hey, I want to know how to calculate the gear ratio of the given arrangement in the picture. I am not sure of how to calculate the gear ratio of two gears on the same shaft. Also the input gear is helical and the output gear is a spur gear. I have mentioned the number of gear teeth, i hope...

I have three sizes of gears with 14, 34, and 84 teeth respectively. I need an exact 1:60 gear ratio. The problem I am finding is that 14:34 and 34:84 are very close to the same value. 14 and 84 is 1:6, but without a 1:10, that doesn't get me far. The closest I can get is 7:612...

Hey, I'm trying to design a part for a prosthetic leg. I need to stop a piston moving within a cylinder at any point in its motion. (this will happen when the patient puts weight on his foot) I was thinking about having the piston turn a gear, and then when it's time to stop it, another...

Homework Statement Here the gear B is fixed and C and D are on the same drive. If C has 100 teeth, B has 50, D has 50 and E has 200. Calculate the ratio of the gearbox. Homework Equations The Attempt at a Solution My attempt is uploaded as an attachment as putting tables in...

i am still newbie , i don't even know if this question should go here or not , but i will ask it anyway. I have a rod that moves vertically , i need use this rod to make a shaft turn. So i had an idea, what if i made this rod toothed and make it move a gear as it goes up , will that work? if...

Homework Statement Two solid steel shafts are coupled together using meshed gears. Determine the angle of twist of end A. Shaft DC is fixed at D. Homework Equations angle of twist = torque * shaft length / ( polar moment of inertia * shear modulus) balance of forces where the two gears...

Hello guys, first of all excuse me if I make mistakes, but English is not my native language. So, I am creating a 4 speed gearbox, I know the ratios of the gears I will be creating, I know the distance between the primary shaft ( the one coming for the engine`s flywheel ) and the secondary...

http://sploid.gizmodo.com/this-mind-bending-machine-completes-one-turn-every-2-3-1457516789 So I read the article above and it gave me an idea, I want to find out if it is possible to build this machine, but with a reverse gear set on the other side of the concrete that makes it spin back up to...

Homework Statement This is a final hurdle of a long question designing a simple gear train. That is done but now am not sure of my calculations for power in / out and torque in and out, so hopefully someone can help? OK - I have 4 spur gears inline, Gear A = 100 rpm 80 Teeth (input motor...

Is the module(M) of the sun,planet and ring gear in a 'planetary gear set' equal to each other always? Is it possible for M to be different for each of the gears in the set?[-Applications of this?] $$PCD_{Ring}=PCD_{Sun}+2*PCD_{Planet}\Rightarrow N_{Ring}=N_{Sun}+2*N_{Planet}$$ is valid only...

Hi, For a final drive of a light commercial truck, I have to design a final drive helical gear pair. The expected ratio is 8.2. The centre distance is 134 mm. The input max. torque is 120 Nm. I have sized few combinations. I have a feeling that this ratio is too deep. Pl. share me your...

Hi, I have done hoop stress calculation on thin walled pipes. But, will gear tooth also go under hoop stress when loaded? Can somebody explain the procedure to calculate that pl.? Thanks.

WHat is the permissible maximum transmission ratio of a Spur gear pair? I read somewhere that it is 1:5. What wil happen if this is exceeded?

As titled.This was taught to me in machine design, but I don't see how that makes sense I would think that doesn't matter how many teeths are in contact, since the force between gears are distributed on each pair of teeth in contact, more engaging teeth just mean the friction is distributed to...

Hi : according to :https://en.wikipedia.org/wiki/Gear#Helicalthe stable configuration is when the cave in one of the gear's "V" teeth drives the arrow of the other "V".where unstable configuration is when the arrow part of V drives the cave of the other Vso assuming the direction of motion is...

(To the moderator,please don't shift to the Homework thread list.This thread explores the conceptual part of gear changes) A 2 liter engine has T(max)=185Nm at \omega_e=4500 rpm, has a manual gearbox with the following gear ratios: n1=3.42, n2=2.14, n3=1.45, n4=1.03, n5=0.81, nr=3.46, nd=4.06...

If i have a small spur gear, and i rotate it and transfer the rotation to another gear with bigger pitch diameter. The output gear(bigger gear) will turn slower right? then does this mean the torque force transferred to the output is greater? So when the output gear is connected to a rope...

First time posting. Homework Statement Gears A and B, of Masses 4kg and 10kg, respectively, are rotating about their mass centers. The radius of gyration about the axis of rotation is 100mm for A and 300mm for B. A constant couple of C=0.75Nm acts on gear A. Neglecting friction, compute: -...

Hi I have always wonder about this. I understand the concept of bevel gear, but never quite see how the involute profile would function in a bevel gear. assuming that there is a tooth(either of the driving or driven gear) located at the center between two gears ( where it has the...

HiI have always wonder about this. I understand the concept of bevel gear, but never quite see how the involute profile would function in a bevel gear. assuming that there is a tooth(either of the driving or driven gear) located at the center between two gears ( where it has the greatest...

Does the gear train in a classic weight driven clock see a torque decrease when we lengthen the pendulum? thanks guys for your help - (inventor question)

Hey! I am trying to figure out the best way to run a AC gear motor off a DC power supply. Any help would be greatly appreciated.

As titled: When moving at a constant velocity, say drag force is the only resistive force, don't we want to amplify the force output? why would we want to use a larger gear for the paddle than the rear wheel's? I understand that we will need to paddle faster with a larger gear output...

Homework Statement Given Where gear 1 is start from the bottom right gear and ends with gear 7 which is located at the top middle. The shaft length are 20cm between gear 1 and gear 2,15cm between gear 2 and gear 3 and 15cm between gear 5 and gear 6. The material of the shaft and gear are made...

Hello, I'm a technical translator from Germany and urgently looking for a particular term: It describes a kind of case/protection around the gearbox which reduces noise emission. The German term is "Getriebekapselung" ("getriebe" = gear, kapselung = "protection/case/capsule?" Is...

Hi All! I would really appreciate your help on something that has been bothering me for the past week. I am uncertain on how to derive the deflection curve equation for a certain shaft. Loads are acting on both ends of the shaft, with the reaction forces being provided by two separate bearings...

In the image showed in the link below I've illustrated a mechanism in which a small gear rotates about a large gear when the motor is spinning. The large gear is rigid and both of the gears are masless, except for the motor. The small gear has a radius of 25mm and the large gear has a radius of...

Hi, I'm trying to design a windup baby toy (think toy stuck on wall rotating) with a gearing mechanism that works similar to a pull back toy car. Essentially I want to do a three quarter turn of the front of the unit anticlockwise to wind a coil spring via a gear train. When the front of the...

I assume that the equation that applies for this problem is M = mg * r. The large gear is rigid while the small gear rotates about the axis which passes through the center of the large gear by rotating a motor. What is the momentum which is required to turn the motor? I'm confused because...

Hi guys: I have 3 questions: Imagine an open differential that looks like a gear ring : and now let's call the rings (orbital gear) the wheel gear, the gear in the center the center gear. 1. is the reason why torque from input shaft is evenly split to both wheels regardless...

Hi guys, I have a question about gear ratio, sprocket or wheel ratio. So let's say I have a motor with connect to a small output sprocket, and I want to use this motor to pull some load, so in order to do this I need to connect the chain with a larger sprocket, let's say 2 time bigger than...

I watched a documentary recently about electricity generation, and I've been trying to figure out whether an example they provided is actually possible or not in theory. If a big wheel, much like a Ferris wheel, spins but slowly, very slowly (let's say 5 revolutions per minute), and you...

Hi all... I'm new here... Homework Statement this is not a homework question, I'm just solving practice questions for exam preparation Two wheels with masses M1 = 2 kg and M2 = 4 kg are connected. The ratio is R1 = 5 cm and R2 = 10 cm Considering an angular velocity of ωo = 10rads-1 for the...

Hi everyone, http://www.freeimagehosting.net/newuploads/wt15k.jpg In the picture there is a rack at the bottom and there is a gear above it. The gear is on a axis which can move on a horizontal line and the gear can rotate without friction between the axis and the horizontal housing. 1) If...

Hello all. Just a quick question about logical operations gears can preform. I know if you have a large gear turn a small gear, the center of the small gear will spin faster than the large. But are there any other logic operations that gears can preform? Thank you for viewing.

everyone know double slit experiment. my question is about second experi which chanced physics. how do we send photons one by one. which machine is used for that and can i get it from somewhere thanks for your answers

I have found these. gathering dust on the shelf in the lab. pictures are attached. first item is some sort of lamp that glows red inside a metal tube. the second item is a rack with a tuning fork clamped to it with at sharp metal prong attached to one of the tuning fork tines anybody out...

Help. We are cleaning out our lab and under the dust are all kinds of old lab gear which look very cool and expensive but can't figure out what they are for. Only clue is Stansi Chicago on some of them. Is there an old catalog or website I can go to so I can identify stuff? If I posted...

Homework Equations e=(product of number of driving teeth)/(product of number of driven teeth) e=(n_{out}-n_{arm})/(n_{in}-n_{arm}) The Attempt at a Solution e=(N_{p1}/N_{s1})*(N_{s2}/N_{p2}) e=1.25926 e should be 0.7941 however From there out it seems pretty trivial. I just need...

Guys, I've just come across this question regarding planetary gear train. I was asked to find the rpm of a gear within the train. but the solution given doesn't include the carrier speed within the calculations. I was asked to find the rpms to gear 4. The carrier is between 4 and 6. What...

Hi, I want to build a simple clock of gears. How I can build a simple gear at home. Thank you...