# Questions tagged [gears]

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### What are positive drive gears? [closed]

Gears are called positive gears and belt drives are called negative drives. Explain in detail.
55 views

### Gearbox oil/grease leakage

Recently I encountered a problem of oil leakage from different driving systems SERVO gearboxes. The transmitted mechanical power ranges from 2 to 8 kW, while the motor speed (the gearbox input speed) ...
314 views

### Why all watches hands are stacked in that specific order ? Can it be changed?

It's just a matter of curiosity, but I find hard to justify why every single watch keep the hour hand below the minute one; from a user perspective, it seems a poorly design decision for those times ...
424 views

### 4 Gears in a Circular Pattern - Calculating the Proper Distances for Meshing

I have recently been working on a gearbox for a robot. I have this pattern of 4 gears with each gear connected to its 2 neighbors. It looks like this: You will probably notice something though. ...
60 views

### Establish a controlled rotation on gears

I am a 3d designer trying to build a simple device for my project and I have a problem. As you can see in schema below, point G has weight on it and it needs to be a controlled, vertical rotation. I ...
72 views

### Rotating Multiple Solar Panels with One Motor

I am designing a system to have solar panels track the sun, but only with one axis of rotation that will tilt the panels from east to west. I want to connect the panels together so that one motor ...
235 views

### The name of this cross-sectional shape

What is the cross-sectional shape in blue called? The shape, used on the shafts, is used for torque transfer, gears or similar. The three arcs are same diameter as the ball bearing ID, so bearings ...
234 views

### How can I couple two small parallel shafts offset a short distance from each other?

I have two parallel shafts, 3 millimetres in diameter and offset by 8 millimetres, both anchored in surrounding housing by ball bearings. When one shaft is rotated (via gear), I want the other shaft ...
93 views

### Will this work for single output twin engine

I’m wondering if anybody can help me by critiquing my project idea of having a failsafe power train 4x4 for remote touring🙂. Instead of having one big engine, I’m toying with the idea of running two ...
1k views

### Is a 1:1 Worm Drive possible?

I am working on a project that requires a wing to be rotated and I need the rotation mechanism to be fail-safe -- if power fails, the wing will stay in place and not move around. My thought was to ...
268 views

### Does the module of 2 meshing spur gears have to be the exact same value ?

Does the module of 2 meshing spur gears have to be the exact same value ? What is the allowable difference? So basically my module is off by 0 01 and my coworker made a model and it works. So I'm ...
341 views

### Trouble with Base circle and meshing with spur gears

I am a novice who is trying to make some gears. I have followed the formula's but sadly something seems to go wrong and the gear's don't come out right. Below is some dimensions and pictures. Gear 1 ...
173 views

### Crafting a mirrored shifting drum for motorcycle gearbox

I would like to reverse the gearing of my Husaberg FS 650e motorcycle so that by pressing the shifting pedal the gearbox changes up instead of down to the first gear. There are many solutions on the ...
179 views

### Resist rotation with friction or teeth?

I prototyped this attractive wooden sit/stand laptop stand but ran into a problem keeping the legs tight enough to hold their position. There are 1/16" thick EPDM washers between the oak legs - the ...
90 views

### What is "error in action" in gears?

What is error in action? And why is it called error "in action".
1k views

### Worm gear for a lifting device

I am designing a lifting device for practical use which is powered by a dc motor with worm gear. The lifting device should be able to hold the load in place at a certain height.however, i read that ...
444 views

### How to connect shaft to gearbox?

I downloaded a 3D model of a planetary gearbox from Rossi website, so the 3D model is reliable. As you can see, there is no keyway on the opening of the gearbox, thus i can't connect my shaft with ...
2k views

### What is meant by "shock load" in gears?

What is meant by shock load in gears? What are steady, light, medium and heavy shock loads?
27 views

### How to find required size of AC gear motor for planetary mixing application? [closed]

I want to find a suitable AC or DC gear motor for concrete paste mixing. The application details are given below Material type - concrete paste RPM - 30-200rpm Qty of material - 30Liters Mixing style ...
196 views

### ~121:1 speed reduction; are more gears better?

Taking a 1750RPM 110VAC appliance motor down to about 60RPM, maybe a little less. It's a home project on the cheap, so dropping a few hundred dollars on a ready-made gear box is to be avoided, and I'm ...
224 views

### reducing rotational speed from gearmotor to below 1rpm

I need to produce a very slow rotational speed for a disk -- 0.25rpm, or 1 rotation in every 4 minutes. The disk is nominally 12" in diameter. It will be driven by a DC gearmotor, through a worm and ...
998 views

### How to mount timing pulleys/belts for small DIY project

I'm building a rotating lamp for a small DIY project to learn about motors and timing belts/pulleys. As I am learning, finding parts that are small enough, fit a stepper motor shaft and reasonable ...
83 views

### Calculating the angles for gear cutters

I need to design some custom involute gears for a project that I am working on and this is my first dive into gears. I worked out how to calculate the size of gears by the required numbers of teeth ...
54 views

### Gear cutting books in metric system

I am learning about gears, hobs and things of this sort. The main book is the machinist handbook which does a pretty good job of explaining things but things are in imperial scale. This causes me a ...
21 views

### Does angular velocity of a body rotating on top of another rotating body add up or multiply?

I want to mount a small engine on a shaft of a large engine and rotate them both in the same direction, will the RPMs be a sum of the their RPMs or will the resulting number be a multiplication?
89 views

### Gear acceleration and maintaining torque

If trying to achieve a 1:4 gear ratio, will a planetary gear system help reduce the loss of torque? Or is it essentially no different than the loss of torque when using a large drive gear to rotate a ...
3k views

### Meaning of O-slash in data sheet about gear diameter?

I have this data sheet for a stepper motor: The pitch diameter of the pinion attached to it is listed as "Ø6". What unit is this? Looking at the wikipedia page for Ø it seems like this is just a ...
262 views

### Why do we use bevel gears?

I understand bevel gears are used in situations were a 90 degree change is required, but I can't visually understand why. Why can't we just use standard spur gears at 90 degrees, what do we actually ...
454 views

### Smoothed Particle Hydrodynamics (SPH) Vs. Large Eddy Simulation (LES) for Gearboxes

In the not too distant future I will be looking to simulate lubricant oil flows in a gear box, with rotating gears located in a bath of oil. I will be looking at the distributions at various angles of ...
402 views

### Can a hypoid bevel gear set have a 1:1 ratio?

[![enter image description here][1]][1]Is it possible for a hypoid bevel gear like the one pictured below to have a 1:1 ratio? If 1:1 isn’t possible, any idea what the smallest ratio could be in order ...
261 views

### Center line to centerline of pivots for two 16 diametrical pitch gears. One gear 72 tooth other 36 tooth

I have two spur gears, each of a diametrical pitch of 16. One gear has 36 teeth and the other 72. I need to know what the distance should be center line to center line of the gear set. This would be ...
60 views

### Contact stress of bearing surfaces

I am searching for information on how finite element code (abaqus /ansys) could be used to model the contact stress behaviour between 2 bearing surfaces? The key point is that there is an additional ...
327 views

### Are 3d printed gears (ABS) suitable for long term use?

i want to print a worm gear for a robot. This robot will work every day for at least 10 hours. The gears size is about the half of a sheet paper. I searched the internet for example in industrial use....
62 views

### Efficient Gearing to Climb a Rope Vertically

I am trying to design a gearbox of sorts that would climb a rope from turning a gear (motor, handcrank, etc). The largest issue is that, while both the top and the bottom of the rope will be attached ...
316 views

### Why do herringbone/double-helical gears have a stable and unstable configuration?

I understand that double-helical gears are used over regular helical gears to balance axial forces in a shaft but, depending on the direction, it seems that these balanced forces can be either ...
77 views

### Gears and rotation

I have to project a mechanism that transform a rotation of $30 \pi/\text s$ from a engine in a rotation of $(\pi/4)/\text s$. One of the gears should be 120x bigger than the other, but this is too ...
262 views

### How to raise a pole with a handcrank and have it lock in place?

Background: I'm going to build a homemade wind turbine. It will be all fancy and rotational so that it's always pointing to the wind, so it will be mounted on a frame etc. This will be mounted on a ...
97 views

### Can a hobby gearbox be used to mechanically amplify small forces for better force sensor resolution?

I am trying to configure a force sensor (a piezoresistive force sensor) in a device to measure small forces (less than 0.5 mN). This is difficult due to noise of the system. One of the ways I have ...
25 views

### Automatic translation of either-sided rotation to fixed directions?

Is there a purely mechanical device that takes in clockwise or counter-clockwise rotation 'indiscriminately' and outputs in both cases clockwise rotation?
516 views

### Use two gear racks to multiply linear motion

I have an object (shown in green) that I want to pull out distance X and then I want another object (shown in red) to move 2X. What would be the best way to achieve this? I thought that gear racks ...
594 views

### Gear Design - Teeth Fit [closed]

I am working on designing a set of gears for 3D printing. I have not done any gear design before - how should I improve the design to prevent gear slipping?
748 views

### How does gear reduction affect a stepper motor's holding torque?

I'm new to mechanical engineering, gears, and motors. Coming from a software/hardware background, I am trying to understand how to leverage gear reduction to maximize the torque output of a stepper ...
213 views

### drive/driven gears

Is it possible to have a drive and driven gear on the same shaft? Rookie question, I know. I've been doing a lot of googling and sometimes I think I understand that they can, but reading the ...
96 views

### Keeping rpm stable with input of floating rpm

How can I create a gear system which keeps, say, 60 rpm stable on output wheel, when I don't care about force? I am using a hand-turned crank as an input wheel. I know a flywheel could be used, but ...
88 views

### moment of inertia forces and torque

I did some calculations to find out the moment of inertia and physical qualities of some metal. I am using typical medium carbon steel. I'll use a density of 7.8 g/m^3 until I get better numbers. ...
99 views

### ft-lbs to ft-lbs3 or newtons as well as strength of metal

I am trying to figure out how much torque this piece of metal that I have can deal with before breaking. Are there any tools online that can help me calculate these items? The hardness of this iron ...
821 views

### Mounting a timing pulley on a ball screw shaft

I have a pretty basic question. I need to install a timing pulley on a ball screw shaft (6mm): http://uk.rs-online.com/web/p/products/2816419/ The processed end (the pointy side) of the shaft is ...
122 views

### Can the pitch circle of a gear be farther out than the intersection point of the involutes on opposite sides of a tooth?

I'm trying to make an involute spur gear generator but can't seem to get it right. I know that the diameter of the base circle of the involutes is equal to the pitch diameter * cos(pressure angle). ...