Gears Definition and 181 Threads

1. Homework Statement [/b] The operation of “reverse” for a three-speed automotive transmission is illustrated schematically in the figure. If the shaft is turning with an angular velocity of Wg= 30 rad/s, determine the angular velocity of the drive shaft H. Each of the gears rotates about a...

I need a ring gear but I can't mill it and I don't know any good way to make gears in the shop, so I'm looking to buy them some place, but I don't know where. I drew up what I need, basically a ring with teeth on it, and a matching pinion.

I'm trying to work out a formula to calculate the amount of torque lost in a two gear system due to the acceleration the second gear. I'm assuming there is nothing lost to friction etc For example, If I have two gears, G1 and G2, with respective inertia's of 2 and 4. G1 has 10 teeth and G2...

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...

I have this doubt on spur gears Is it necessary that the pitch circles of the two mating gears need to be tangential? or will a small gap of 0.3mm matter?

Hi guys, Great forum. I'm a frequent reader and first time poster. I'm having a great deal of difficulty getting my head around something I have been researching. If you have a wind turbine that is powered by wind (obviously) and causes the rotor with blades to spin at a constant...

Hi friends I have a little doubt on the gear ratios of a bike like a mountain bike which have front sprockets also. It's clear that we get maximum RPM and min torque out of a bike when the chain is on smallest sprocket at the rear and largest at the front(highest gear ratio). But i read...

So this is something I've been thinking about... Let's say you have an engine and a motor. The engine has high torque (let's just say 3,000 ft/lb) and low RPM (2 RPM) and you attach a huge gear to the end of it (10 ft circumference). A very small gear (1 inch circumference) is attached to...

Hi PFians and friends Have a look at this basic transmission. I was wondering if the gears on the layshaft somehow remain of same radius as the first gear on layshaft (I know then the mechanism has to be different), then won't be our transmission better. e.g consider the case of 1...

Hello all , We have to design gear to move a weight of 0.2kg over a distance of 0.1905m so we know the torque that comes up to =0.2*9.81*0.1905=0.37361N-m ...how do I decide the diameter ...number of teeth on pinion and driven gear ...wat are all the parameters shuld I consider for designing...

During internal viva, we were asked what is the particular advantage of using helical gears over spur gears. The guy next to me answered that it has higher load capacity given similar dimensions, similar material etc. Professor accepted his answer. I was kinda like :confused: When I was...

Hello, I need some help with the general very basic cost analysis of an injection molding machine and a mold for a particular part (Plastic Gear). For example, a Gear made out of Nylon plastic resin. The gear dimensions are roughly 2 cm diameter (20 teeth). Something like the black one...

hypoid and bevel gears!help can anyone tell me if the calculation of bevel gears angle is the same as hypoid gears! if not does anyone know how to calculate hypoid gears?

Greetings, I decided to use a professional calculation package for machine design procedures in order to speed up the design process. This package somehow calculates a safety factor for pitting corrosion for spur gears. However I haven't been able to figure out how this is calculated. So far...

I want to play with gears - make my own and such. (They'd be custom, so it's not like I could put in an order for them to be made.) What are my options for getting access to the right machines?

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.

Bicycle gears, energy, work and power?? hi everyone, let's say you're riding a bicycle, and as you approach a hill, you shift to a lower gear. You pedal at the same rate, however. Does the power increase, decrease or stay the same? An explanation would be helpful. I've been trying to reason...

DeaR ALL I WANT to do mini project in gear design. I need comment about my objective selection and Technic used to solved. Gear design objective, i got only power ,speed ,service condtion,centre distance range, face width as input details. Result output is No of teeth,module, centre...

hiya, i need some help for a project I am working on, basicly i have a compressor pump that runs at 500rpm and @ 12 hp. now the problem is (this is a theoretical problem) i have to power it using a 3480rpm ac motor which has to be less than 10 hp (cost reasons). rough calculations show...

Hi, I really need help with these two problems from my homework set (got em all done except these two). It would be great if some1 could help me out with this as soon as possible (ESPECIALLY THE FIRST PROBLEM...have no idea how to go about it). Thanks in advance. A cam drive is used for a...

i know on my bike i can't change gears if I'm not spinning the wheels and i know in a manual transmission you can't change gears really unless you're moving. anyone know of a transmission system that can change gears while stationary?

Hi, I'm trying to build a car out of legos using the LEGO Mindstorms set that will go really fast. I'm familiar with the concept of gear ratios (i.e. a 40t gear driving an 8t gear) and using that to increase speed, at the cost of torque. Another method is to attach an axle to the following 8t...

Hypothetically, if you had an engine that had unlimited revs or unlimited gears would it have infinite top speed NOT acknowledging air resistance,universal speed limit, and fuel?

Homework Statement Gears A and B are connected by arm AB. The angular velocity at A is 60 rev. per minuter (clockwise), find the angular velocity at B if a) wAB = 40 rpm (counterclockwise) b) wAB = 40 rpm (clockwise) Homework Equations w=dTheta / dt w = v/r The Attempt at a...

This is my first post Sorry that it has to be such a stupid question... How does one draw a worm gear along with its worm wheel? I know that a worm gear is made up of a helix but I sure hope that I do not have to draw that! Is there a much simpler representation?

A five-gear assembly is put together with spacers between the gears. The mean thicnkess of the gears is 5.03 cm with a standard ev. of .008. the mean thickness of the spacers is .140 cm with a standard dev. of .005. Find the mean and standard deviation of the thickness of the assembled units...

Hi all! I open a new thread since I am going to post another picture, and this would overload the old thread. The first picture shows the number of teeth of the meshing gears. I was wrong that the pair of worm gears are glued. They are not glued as mentioned by Q_Goest. And the two gears...

How are those tiny screws and gears manufactured, do they have some kind of crucible prepared and pour molten metal in them ?

Now that Tiger has been released Steve Jobs and Apple are focusing on the next version of OSX.

I was curious if anyone knew where a person could find a various assortment of gears, such as used on radio shacks basic electric motors. I need a wide range of gears, shafts and couplings, but I'm having trouble finding such small scale parts. I would think a hobbie store would have some of...

Ok for this project I'm supposed to build a vehicle that is human powered (the easy part). the hard part is, I have to make a claw that will be able to grab things like erasers, balls, and a bucket with a 2.2 lb weight in it. It will also have to be able to grab a ball from a stool and place it...