Gears Definition and 181 Threads

Okay, so I am having a problem, I'm not the greatest at math, here is the problem: I need a set of reduction gears, my plan is to have a gear attached to a shaft (base diameter of this first gear is 33mm) with 50 teeth (maybe?) To turn a reduction gear that will be on another shaft that will...

Hi, I observe in an automobile transmission that two meshing gears of same material are never of same face widths. Either the driver of driven is a couple or more millimeters wider than the other. Most of the time (not always) the pinion is wider than the gear. Though I can assume that the...

I'm trying to design a system of two arms connected by a couple of gears. The attached picture shows the setup better than I can describe it. Note, the arms are of equal length and the gears are of equal size. What I'm trying to understand is how to calculate the optimal number of teeth per...

Acceleration is not Force/mass, mechanical advantage (?) I have a vehicle with wheels and electric motor that drives that wheels. Those are characteristics of engine Resultant torque and velocity at wheel will depend on radius of that wheel, as wheel work as gearing. Let's say i will try...

Rotary (Gears) question -- angular acc/velocity involved Homework Statement Homework Equations w (angular velocity) = alpha (angular acceleration) t w1 / w2 = r2 / r1 |a| = sqrt( (a(tangential))^2 + (a(normal))^2 ) The Attempt at a Solution Since A has a constant angular...

Gear C has radius 0.12 m and rotates with angular velocity 1.9 k rad/s. The connecting link rotates at angular velocity 1.5 k rad/s. Gear D has radius 0.05 m. Find the angular velocity of gear D (in rad/s). Note that gear C is pinned to ground and gear D is a planetary gear. Since gear c...

Hi all, i have a doubt. How much teeth in relationship to his radius need to have a gear to be optimal? And, if i have 2 gears with same radius and same #of teeth, to have low friction and low negative effect from weight how much teeth they need to have and with which radius? I know it's too...

Insect uses mechanical "gears" to coordinate jumping journalist report: http://www.csmonitor.com/Science/2013/0912/Insect-uses-gears-to-jump-study-finds scientific report: http://www.sciencemag.org/content/341/6151/1254

Hi, If I have a clutch that meshes on an axle and two idler gears with clutch teeth how do I: Have both gears rotating but when one of the idlers is engaged stop the opposite gear spinning, so just this one spins. The clutch is double sided of course so there is a gear either side. id...

Dear Experts I have this problem for a long time. I always cannot get my project done because parts are not available. I need gears, eg. Pinion gears of certain size of certain number of teeths and the hole in the middle of the gear need to be of certain size. How do you normally get...

Hi: according to the wikipedia page: https://en.wikipedia.org/wiki/Gear#Double_helical the unstable and stable configuration would disassemble and correct the axial misalignment respectively. I analyzed the forces on the meshing tooth and that doesn't seem to be the case...

Homework Statement Describe the forces acting on the shaft AB Homework Equations The Attempt at a Solution I've ignored the bearings for now... but I know each of them has 2 forces, 1 in the radial direction and the other in the tangential direction ... Anyway, this is my diagram (sans...

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...

Hi, I know you can use gears to increase the torque of a motor while it is rotating, but what about when it is still? Will the holding torque be any different from the case without gears? I expect that there won't be any advantage, but want to make sure.

I have attached the problem. I am a bit confused on how this schematic works. The 3 forces on the bevel gear should translate to 3 moments where the bevel gear connects to the shaft. Will there also be any forces where it connects to the shaft?

my lecturer keeps saying that path of contact of an involute gear is straight line but without the reason. i can't digest it as i can't find the reason for this behaviour. I'm trying my best to find the reason. Internet too can't find an answer. Books don't give a timeline of how it happens. Can...

Hi guys, new here to the forum. I was an electrical engineering student but am now working on more of a mechanical issue so I'm a bit out of my element. I am working with a small electric motor attached to a gearbox. The final gear opens and closes a metal valve. I am having trouble finding...

so, I'm a mechanical engineering student, fairly new at it though. I have a really strong real world grasp of mechanical principles, and really enjoy doing things like auto repair (consequently, my schedule is often interrupted by folks that know this fact, and want cheap auto repair) so with...

This may be simple to some, but this is my first experience with designing gears, so bear with me... I'm trying to "cut" a spur gear to match the profile of the pinion gear I designed. This gear won't carry any load, it's basically for esthetics, but I want good contact between the two...

For example in this video at 5:00: They show by turning the gear with little force allows for one to move a VERY HEAVY gate to operate the sea locks. I don't understand how this is possible. Could anyone please explain the physics/theory behind this? Thanks!

Good morning engineers. I have a set of old patterns used for sand casting back in the days and I am wondering what kind of machinery parts they are. Especially, I would like to know if those are gears / cogs or something else. Any ideas? Thank you so much!

Homework Statement Already calculated: Tangential Forces : Pinion A=2850 N Gear B=2850 N Pinion C= 8550 N Gear D= 8550 N Radial Forces: Pinion A= 1000 N Gear B= 1000 N Pinion C= 9100 N Gear D= 9100 N Diameters: Pinion A= 60mm Gear B= 180mm Pinion C= 60mm Gear D= 200mm The distances...

Hello All, I am designing a small Mil-spec power generation system and I wanted to ask opinions on which energy transfer drive I should use. I am currently calculating speed and torque reductions so I have not reached a final ratio yet. My design will most likely take low rpm and increase it...

When you are in a particular gear (say 2nd) , you can vary the speed of vehicle. So what actually is varied in the system as you are not changing the gear, iis it the amount of charge or rpm of the engine is varied to increase speed in a particular gear? Also while changing gears, does the...

Hi guys, I was doing my tutorial and given the angular velocity of the first gear, we were required to calculate the angular velocity of the 8th gear given just the no. of teeth for all the gears. Now I know that there must be a faster way of calculating the angular velocity of the 8th...

Hi all, I've got 2 bevel gears that I'm recreating in CAD, I've got the shapes down it's just a little bit of fine tuning with the dimensions, for which I need the module/diametral pitch of the gears. The pinion has 9 teeth and a tip diameter of roughly 39.3mm, and the gear has 14 teeth and a...

where can i get Solidworks models of spur gears? I have Solidworks student edition, and it doesn't include the toolbox that you can use to create gears. thanks

lets say i have an electric dc motor and i connected its shaft to a planetary gear system. this planetary gear systems last stage's ring (outer rim) spins a drum. this drum feels an outer torque T as a consequence of loads. my question is motor will feel torque T, becuase i read that the...

Homework Statement Since Gear A -------- Vi=0 t=12s θ=40∏ as given in the question, can I assume that Vi=0 t=12s for Gear B/Drum C as well? If not why? Thanks..

Say we have a gearing system of the ratio 4:1 is the acceleration of the smaller gear 4 times greater than the acceleration of the larger gear or do they both accelerate in the same way or is it a completely different more complex relationship? Thank you in advance for any help.

I have a gear train system where i have 3 gears meshing with each other (different sizes) gear A, B and C. Gear B is my input/driver and gears A and C are my output/driven. If i know the input RPM and input torque for gear B, what are the gear ratios/the amount of torque transmitted to gear A...

I'm building a simple 20:1 gearbox prototype with 2 compound gears in a row connecting to a third small gear at the end. My goal is to multiply the rotational speed of the small gear. They are all engaged on a straight line. But for some reason they get stuck most of the time. I'm trying to...

i have to design gears for a screw jack. i have initial rpm 1500 and final rpm 100. my gear at the point of the power screw is 0.04 m and i want to calculate the diameter for the other 3 gears. can you please help me thank you

Homework Statement Consider a gear set with the following attributes: • A pinion base radius of 11mm • A centre distance of 73mm • A pressure angle of 24 degrees • A module of 5.8mm What is the maximum addendum radius (mm) that the pinion can have to avoid interference...

Homework Statement Hello fellow Physics Forumers My first post and , hopefully not my last. I've been lurking for a long while and the tempo has increased since I started my 1st year engineering course last semester. So I decided to register today as I have a bit of a puzzle. We have a...

Hi all, brand new to the forums. I'm a student of chemistry so I am very unknowledgeable about mechanical engineering and need some help. Not asking for spoon-feeding. What I am trying to accomplish is fairly simple(I hope). I would like an electric DC motor to turn a 1in diameter teflon...

I have a basic understanding of how to calculate gear rpm, but have no idea as to how one could figure out what size and number of teeth you would need if you want to give X turn to the drive gear to get a rack to slide Y inchs. Obviously I would want to contain the entire assembly in the the...

Folks, 1) Transmission Error: I understand it is the deviation of the driven gear from its theoretical position based on the driving gear moving with uniform angular velocity. Ie it is a measure of the where the driven gear actually is compared to where it should be...but I don't understand...

Which is the correct formula to calculate the center distance between gears? I am designing a couple of spur gears in Autodesk Inventor and the application says that the center distance between them is 23.107 mm, but when I place them so far apart they seem to overlap. The gears have the...

Why do bikes have higher gears? At a higher gear, I'm still pedaling with the same force, but at a lower speed, so my power output is lower. What's the advantage of higher gears?

Why is it that most of the bicycles have 10-20 gears, wherein motor bikes have mostly up to 6 gears? Is there an engineering reason behind it?

Hi, i would like some help on how to calculate the forces acting on each gear if the machine had 4 for example gear 1 has a diameter of 100, gear 2 has 300, gear 3 has 133.34 and gear 4 has 266.66 the machine is driven by an 80kW motor through a 2 stage gearbox having four spur gears...

ELECTRICITY GENERATION THROUGH THE CONVERSION OF ENERGY PRODUCED BY REVOLVING GEARS OF A TURNSTILE As the title implies, do you think it's feasible? I'm working on it as a topic on my research subject, but I'm having a hard time. I didn't know that there are lots of principles involved...

Hello! I need to calculate a water velocity between the gears (80 mm diameter) during their rotation at 1000 rpm. The water velocity should be determined on the gear surface. The minimum gap between the gears is provided by an insulated spots, the value of which is 50 microns. The insulated...

I have looked everywhere to try and find how to calculate the distance a rack will move. I have a mechanism where every revolution of the pinion, the rack will move one direction, then it will move back in the opposite direction. So I assume the ratio will be 2:1, every one rev the pinion...

hello, i am doing gear calculations my problem: i get several point numbers for the module of the spur gear din 780 suggest a standard table with modules so i just have to wrap up my calculated modules, for example: 3.91 => 4 ? thank you vm !

Just happened on my friend's facebook, Person A. I am Person B. Person C is an old lady. Now, this particular example did nothing to "grind my gears," (it's on facebook for crying out loud) but it reminded me of cases that do. Have you ever applied the knowledge you've learned through...

I'm doing a comparison on worm sets over spur gear sets and I came across a question that seems rather simple, but I can't quite resolve. Here it is: [PLAIN]http://img403.imageshack.us/img403/4848/42786849.png I do know that worm sets typically achieve high torque and a low speed gear...

I took apart a 9.6v RYOBI cordless drill and was wondering which of the gears in the transmission are locked. There's the 1st and 2nd stage sun gear, 1st and 2nd stage spider gear, and ring gear. I think the ring gear is one of them, but which else are also locked, if any?

Iv'e noticed that gears play the major part in supplying energy -- that even though we can get energy through solar-wind-water applications -- with the exception of solar energy -- we are grounded to converting this energy into mechanical energy. Is there a way to tap into electro-magnetism...