Gear Definition and 402 Threads

Hi, I am having a problem analysing the kinematics of an epicyclic gear system. The system contains 2 planetary gears, one on top of the other. The centers of the planetary gears and the sun gear are all in line. The system also contains a ring gear on the top most planetary gear. Both planetary...

Im having trouble with designing gear. I was given only the output speed and input. May i know what are the required steps to follow to design a gear reducer?

Hi everyone, I hope I have posted in the right place. I'm a commerce student and have absolutely no idea about mechanical stuffs. My father has an idea in mind which he would love to implement. He too is a commerce student. Hence, I need some help from you'll to see if this is really practical...

Just something I started to wonder about. It is said that if you park on a hill, put the hand brake on and leave the car in gear. First when I heard about it, I figured its pretty clever, giving the wheels more friction to overcome. Now shortly after I heard that when parking on a hill, facing...

Hi all, I'm an EE student and i have least knowledge about working of gears. I just want to know that if there are two shafts S1 and S2 of same diameter having two gears G1 and G2 mounted on them respectively. The gear ratio is 1:2. And the shaft S1 is connected to a motor which rotates at...

Hello I want to ask that is it possible to have the number of teeth of sun gear and pinion will be same? As In my case the ratio is 4:1...outer ring is fixed and sun gear is the input. I want to use three planets. and if I take 14,16,17 for the sun gear then the condition of (Z1 +Z3)/number...

Hi, I'm trying to find some formulas to figure out the force on the bolts of a cam gear.

Hello all, Named this WORK because I don't know if a am talking about Force or Torque ! I am trying to do up a M20 nut on a shaft - would like to tighten to say 200 N.m which I can do with my scawny arms and a 400mm long spanner. BUT the situation doesn't allow for me to actually place the...

hi, I want to find the reliability of a landing gear, shall I consider the hydraulic system as well or just the components of a landing gear. I think mainly we have to consider shock strut, turnion, tyres, wheels and braking system to find out the reliability of landing gear, are there any other...

Hello, I have to design a series planetary gear speed reducer. I have to ask first that what is SERIES planetary gear? Can anyone give some detail about this. I have to design a gearbox with three stages with a motor power of 45 KW. Input speed of Motor is 2800 rpm, Max outer dia of...

This is outside of my area of expertise, which is why I making this post. I'd like to replace a couple of spur gears that have worn out, but am not familiar with descriptive terminology. How may I determine what gears to order? I want to make sure I order equivalent parts. The originals are...

I am in the process of designing an engine stand for a 4000lb semi engine. How do I determine the torque required to turn the engine at the end of the shaft?

Homework Statement A gear ratio is req from A/D of 1:100 and that it will be necessary to redesign D so that it has 100 teeth. Determine: a)number of teeth on c b)number of teeth on planet gears. This followed on from another question. An epicyclic gear c is the annulus and is fixed. The...

I'm designing a 2-stage gearbox for a project at school (15:1 ratio, must transmit 20 hp, for a full-time 10-year minimum life). I've come up with 2 basic gear combos for my layout: 1. 16,80,24,72 2. 16,80,16,48 I've done all the calculations for each layout such as making sure that the...

Homework Statement The wheel is rigidly attached to gear A, which is in mesh with gear racks D and E. If D has a velocity of v_D = 5 ft/s to the right and wheel rolls on track C without slipping, determine the speed of gear rack E. Set r = 1.4 ft. Homework Equations angular velocity of...

excuse me,may someone list down all the gearbox components, i have some difficulties in finding all this..tq..

OK, so I'm looking for a job! I have had the same mechanical aptitude test3 or 4 times, and I just can't find an answer to one question that I really want to double check, just to make sure I am right. So here it is; There are 4 gear, just to ease the explanation I will say them like coin sizes...

Can anyone tell me . if I am going to lift up a scissor lift using power screw drive by a motor, the highest torque is during lowest position before lifting so this is a maximum torque and the speed RPM is the speed i wish to lift scissor up with a turn equal to a lead of the screw? So during...

Greetings everyone, I'm in the process of designing a compact can crushing device for use on my college campus to crush aluminum beverage cans. The device consists of a 6ft tall x 5'' diameter steel tube mounted vertically to the inside corner of a residential style wheeled dumpster. The...

Hello all! I am usually lurking and posting around the EE side of physics forums, but I have a project that deals with a little bit of mechanical stuff (please move this thread if I'm in the wrong place), and the mechanical aspect of engineering certainly isn't my forte. To be as superficial...

i am working on design of a machine which requires use of gear. I need to transmit horizontal rotational motion to vertical rotary motion. my question is their a means of getting the specific type and specification of gear am to use without calculating? if am to calculate how do i start and what...

Hi. I am designing a model for a vehicle. The power source is solar energy, providing power to a single 12 volt motor of about 1W. Through tests I have calculated the stall torque and max RPM of this motor, and therefore a rated torque of 0.00154 Nm. At this load the motor should ideally spin...

Physics is unable to explain the acceleration of the universe and the law of gravity isn't as accurate and obsolete as they thought it was.. How do we react? Invent dark energy and dark matter to take care of the non-accurateness of our knowledge. It is very easy to adjust a formula by adding...

Homework Statement Two masses, having mass moments of inertia J1 and J2, are placed on rotating rigid shafts that are connected by gears. If the numbers of teeth on gears 1 and 2 are n1 and n2, respectively, find the equivalent mass moment of inertia corresponding to theta_1. Homework...

hello, i got this project on how a bicycle operate, and my part is to calculate the gear ratios of the bike, so can anyone share with me the step on finding the gear ratio of bicycle

Hi everyone I'm trying to write a computer simulation of meshing gears (actually its for a videogame), but my understanding of gears and torque is sadly lacking and I'm having trouble finding the answers to what I think are probably very basic questions. I apologise if I've posted this in the...

I have a motor driving a gearbox. I had DE bearing of the gearbox replaced recently as pitting in the inner race was found. Before re coupling the two units, I had the motor vibration checked and found to have satisfactory vibration levels in horizontal, vertical and axial directions. After the...

I have a basic question on how the power efficiency of wind turbine affected by the gear ratio. Suppose there is a generator connected with the rotor through a gear enhancer, a higher angular speed of generator is obtained. Since a higher voltage is produced, we may think that the power...

Homework Statement 1800 HP motor spins at 6600 RPM FIND: 3 stage reduction (and 90deg turn up) to main rotor to spin at 300 RPM 2 Stage reduction (and 90deg turn to the side) to tail rotor to spin at 1700 RPM Homework Equations torque = 525*HP/RMP Saftey factor = 2 Loading...

For an analysis of a robot component: a Spur gear drive/train. How can I account for friction losses? I can calculate the torque, with neglecting friction. And what about the change in energy? I know power = torque*angular velocity

Hi, I have a elec generating unit. The shaft has a rpm of 15000. Need to reduce to 250-300rpm i.e. bring it down to generating elec at 50Hz. Could somebody suggest which gearbox is suitable for this application to reduce from high to low rpm. Also suggest which type of coupling has to be used...

I've seen several posts with questions regarding transfer of energy and momentum through a gear box. Following is a problem I'm trying to work out but I clearly don't understand the physics involved: A flywheel with inertia of Ifw initial velocity of ωfwi = 10,000 rpm is connected (assume...

pls i need help on this one... i would like to know how gear profiles are specified

I have an application where I need to size gears for a set of cylinders with different diameters, and the surface speeds of the cylinders need to match. Does the ratio between gears have to equal the ratio between pitch diameters? This is our first application where the diameters of the...

Hi, Cant understand this at all, even modeled the set up with lego but still can't fathom it! I can't see how the arm can rotate with locking something. Cheers

I am trying to find the name of a particular type of joint--I assume it has a name since it is pretty common I think. Imagine two shafts (A & B) joined at 90 degrees to one another with a bevel gear. With both shafts in a constant x-y plane, rotating shaft A will cause shaft B to rotate...

Hey guys, I have searched for information, but I'm looking for an explanation on the difference between a safety factor and a service factor for gearing, and how you would use the latter of the two in calculation (i.e. does it work like a safety factor?). Does anyone have any references that...

worm gear CAN NOT selft locking ! Good day Sir, In the 150 tonne hydraulic crawler crane, to lifting the boom and load, they use pump to drive motor. As motor rotated, it make the worm gear rotate together. and the spur gear rotate too. So the winch rotate and the boom is lifted. I know that...

Ey guys sorry if this is in the wrong area; not too sure but i do mechanical eng and figured it was. Well i hope so lol otherwise i might have selected the wrong course We have an assignment coming up, (according to past year students that involves DC motors, gear box's). Wouldn’t mind...

Hi all, first to say sorry if the question is repeated second time I've order a couple of internal gears from Rollix as picture below: http://img155.imageshack.us/img155/5996/centerdistance2.jpg The calculation from them for internal gears with center distance C=331.494 (mm) Backslash at...

I have a project where I am using a hobby servo with 133 oz/in of torque which currently has a 32 tooth timing pulley on the output shaft ard driving a 102 tooth timing pulley connected to a camera platform that has a 950g camera sitting on it. The issue is that the camera weight needs to be...

When I was younger I drove stick shift cars. Reverse gear was always all the way over to the right and down in the cars I drove (MGB and Jetta). I'm car shopping now and thinking about getting a car with manual transmission again. I noticed that some have reverse gear down and right, but...

We all know that there are several options of front sprocket/rear sprocket combinations that achieve the same gear ratio. i.e. A large front sprocket with medium rear or medium front with larger rear will produce the exact cadence at a given speed. What I've always wondered, is there any...

This coursework question I am faced with is very specific and quite difficult to explain so I have attached the question. The writing on the side is not that important so don't try and make sense of it. The question asks to find the angular velocity of 2 planetary gears (which are connected...

okay. i recently had a forum asking about gear ratio that has me so confused on the concept of ratio that it hurts. if you have a 40 spline gear and a 20spine gear. and ur power input is on the 40 spline gear. doesn't that mean the 20 spline gear will rotate twice every time the 40 spline...

hi everyone! I'm sorry if this seems like a really easy question, but... Suppose I have a device in which manually rotating gear A clockwise causes gear B to rotate clockwise. If gear A and gear B are at a weird angle to each other (say 35 degrees), what sort of intermediate parts could I use...

Hi there, I am simulating the hybrid transit bus, Its max speed is at 60 kph, most speed used on road is below 20 kph (more than 60% of its total operation time) The bus follows stop-and-go pattern almost all the time. The bus is to be fuel cell/battery hybrid, therefore it uses an...

Hi All, I have a project which involves pulling a sled (wheeled, on rails - low friction) weighing approximately 15kgs over a set distance and time. The distance is approx 60cms and the duration is 3 days. To minimise cost I intend to anchor a motor(ac or dc)/gearbox combination and use a...

Hey I have a assignment to produce a excel work book to calculate acceleration time and top speeds for different gear ratios in race cars. I have so far work out time to accelerate to top speed, but I want to add a bit more detail to my graphs by showing the speed loss during gear changes...

If I have a gear system that consist of 2 gears that are meshed together the first has 16 teeth which is the driver and the 2nd has 36 teeths which is the follower, power transmitted by the driver equal to 5 kw and the driver is rotating at 30 rps and has a known diameter, the usual way to...