Questions tagged [gears]

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8k views

Calculating load on planetary gear from driving torque

I am very new to gears I am fairly confused about planetary gears. I want to know the load on the gears contact point between the sun and the planets and the planets and the ring, assuming the ring ...
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1answer
359 views

How to model a planetary gear system with transformation matrices?

I need to model the planetary gear-train with transformation matrices of 1 sun and 2 planets system, with no ring and an "arm" or carrier holding the gears ,like in the second picture. I ...
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1answer
55 views

Why would "quality of the gearbox" affect torque of a machine tool?

I read a manufacturer's web site which has the following statement: Some manufacturers promote their higher horsepower as a selling feature over competitors. However, it is critical to recognize ...
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1answer
3k views

Worm Gear and Worm Shaft for 2 axis

Can a worm gear be used for linear motion as well as for rotation? To be more specific. Suppose I want the worm gear to rotate as well as move forward, is it possible to achieve that ?
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5answers
72 views

How can I add the torque of multiple gears?

If I have 3 gears meshed with a gear in the center of the 3 gears as shown in the picture. all of those 3 gears are connected to different power sources. They are free to rotate in the same direction ...
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0answers
18 views

Sign convention for angular velocities in 3D gear train

Consider a Humpage gear train shown above. We are viewing the gear train from right and gear B is rotating in clockwise direction. If we consider clockwise direction as positive what will be the sign ...
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0answers
24 views

Gear Oil HP 85w-140 vs HP-140

I have a 4 Stroke scooter 150cc (SYM JET-14). Manufacturer recommends 85w-140 gear oil. The price difference between 85w-140 and single grade 140 is tremendous. Given that in my country and during ...
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0answers
48 views

What is a good approach on creating a custom robotics gearbox

I would like to put together a custom gearbox of the scale of around 50mmx30mmx30mm to fix a gadget that I am designing. My question is how should I approach producing this? Should I design components ...
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0answers
27 views

AutoDesk Inventor Export Dimensions from Design Accelerator Generated Spur Gear

I'm working on modeling a turret-like mechanism in AutoDesk Inventor. Part of my design involves a rotating table. In order to accomplish this, I used the spur gear tool to generate a set of spur ...
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0answers
20 views

How is the equivalent spur gear diameter of a helical gear equal to (d/cos^2α)?

The book I've got says that the equivalent spur gear radius(re) = (Semi-major axis)^2/(Semi-minor axis) of the ellipse made by the cut-section normal to the teeth of the helical gear. There is no ...
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0answers
170 views

How does this SpaceX Starlink ground station antenna's gear mechanism move it in both altitude and azimuth?

Ars Technica's Teardown of “Dishy McFlatface,” the SpaceX Starlink user terminal links to the YouTube video Starlink Teardown: DISHY DESTROYED! and a screenshot from there is shown below. There are ...
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0answers
35 views

What are the limits of small 3D printed gears?

How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?
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0answers
27 views

Can we reduce pitch of a lead screw to reduce backlash of the lead screw?

In gear design, the backlash is introduced in the design itself (not by tolerances of manufacturing) to allow free meshing of the gears. The backlash in the design can be minimized by reducing the ...
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0answers
47 views

Building a custom indirect actuator, any thoughts?

I’m trying to create a custom indirect actuator, that is controlled by a microcontroller, for a custom robotics project. I have selected motor and gears (according to Fd = W = T2*pi) so that the ...
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1answer
49 views

Precision of a steeper motor and gears vs multiple motors

We are a student team trying to design a low cost CNC plasma cutting machine. The CNC will be a table with two rails and a bridge moving on them in which the head of the plasma torch will be. Now we ...
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0answers
44 views

Can we calculate the torque acting on the last gear determine teeth of the gears of the gear train in the below addressed manner?

The specifications of the generator is as follows: Efficiency- 70% Rated Torque- 0.56Nm Rated current- 14.3A Voltage- 24V Rotor shaft dimension- 1cm(diameter) The ...
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1answer
47 views

How to I determine the dimentions for a worm gear?

I have a worm gear set with no drawings. I need to model them. The only things I know are 1) The Gear ratio is 30, and the worm gear only has one thread. It is a single start as opposed to a multi ...
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0answers
95 views

Wobbling DC motor head

I have used 250 watt DC motor, for DIY electric potters wheel. Motor rated with RPM 3300 and geared reduction to 330 RPM. The issue I am facing is wobbling of the motor head. This issue is with the ...
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0answers
32 views

Bevel gear friction and inertia calculation

I want to calculate the friction and inertia between 2 bevel gears with straight teeth. I know how to calculate those parameters between regular gears with straight teeth. Is there any difference for ...
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0answers
34 views

Efficiency of harmonic gear drives

Does anyone have application experience with harmonic gear drive efficiencies as opposed to planetary or parallel axis reduction systems? I'm looking into drives with about a 25:1 reduction, and it ...
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0answers
66 views

I need a mechanism/method to control a shaft that can rotate at different speeds. (faster clockwise and slower anti-clockwise)

I need to develop a mechanism - Where in I have a shaft that needs to rotate at different speeds. Lets say at a higher RPM clockwise and a lower RPM anti-clockwise. This shaft is attached to my ...
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0answers
76 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
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0answers
30 views

gear design.improving gear strength

For improving the gear strength, which one is better based on manufacture and economy? Increasing module or increasing N? With the same surface strength.
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2answers
60 views

A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
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0answers
59 views

Need bevel gear for SG90 servo motor

I am looking for a away I can convert the horizontal rotation into vertical, typically we use bevel gear for such thing. But I am using a SG90 servo motor for which I am struggling to get the correct ...
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0answers
27 views

Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
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0answers
30 views

What are the some of the best (dis)engagement mechanism for small gears?

I’m planing to build a robot out of gears. I was wondering what kind of (dis) engagement mechanism would be suitable for gears that are about 2.5cm (1 inch) in diameter. PS: preferably, (dis)...
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2answers
115 views

Reacting Propeller Torque?

A motor is used to drive a shaft that is geared through 1:1 bevel gears to a propeller. The shafts are mounted on bearings in a hard casing that is attached to a 2nd ground. I want to know if the 2nd ...
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0answers
305 views

How to calculate bearing loads in a two stage helical gear box?

Here P, Q, R, S are the bearings and G1, G2, G3, G4 are four helical gears. The gear forces tangential(Kp), Axial(Ka), Radial(Kn) are known. All the distances are known. The forces acting on bearing ...
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0answers
282 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 ...
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0answers
265 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 ...
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1answer
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?
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1answer
72 views

Marginal Planetary Gear Set

I have to calculate a ratio of a planetary gear set. It's an existing gear set and had been already implemented for years ago(works fine). Somehow it does not fit the general formula of planetary gear ...
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0answers
49 views

What actuators do the me-shifter gear shifting system uses?

I have a shifter kart (125ccm kz2) with 6 gears. What I want to do is to change gears from the steering wheel. Like in the system mentioned in the question. I have the electrical and electronic ...
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0answers
113 views

Lead calcuation for spiral bevel gear

I want to machine a spiral bevel gear on a manual universal milling machine using a involuter gear cutter. I also have a differential indexing setup for this job. But the difficulty I am facing is ...
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0answers
455 views

Planetary gear efficiency for a variable load

I use the Maxon planetary gear #203115 for a project. Here are its characteristics (from the datasheet): $n=12:1$ 3 stages $C_\max=7.5 \mathrm{Nm}$ $\eta_\max=\eta(C_\max)=0.81$ Maxon precises that ...
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0answers
129 views

Rotating a small crank with a large wheel

I wonder if there's a way to rotate a small crank by turning a large wheel. Here's a diagram: Is there a way to design the slot on the wheel for the crank pin? A standard, straight radial slot won't ...
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0answers
414 views

Gearing for Multiple Forward / Reverse on Single Drive Shaft

This model illustrates my question: Red is a motor Green is the drive shaft Orange are nylon straps Blue are spools for the straps I want to be able to drive multiple spools in multiple directions ...
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1answer
1k views

Finding the diameter of a Triple Thread Worm Gear

For a Board Exam Review: A triple thread worm has a diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Material for both the worm and the wheel is of phosphor ...
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2answers
89 views

How to fix this gear

This is a gear that transfers force from a motorcycle kickstarter to the transmission. What method should I use to repair the missing teeth.
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2answers
7k views

What is the relationship between drive shaft diameter and torque output?

I have a DC motor with a shaft with a diameter of x. It would produce some torque T because torque is proportional to radius. If I stuck a pulley on the shaft of radius 2x, then I would produce twice ...
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1answer
50 views

How to calculate this gear ratio?

I have built a little gearbox to reduce the RPM and increase the torque, that is composed of 8 gears that are all equal: they have 12 teeth "in the small side" that transfers the motion to ...
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2answers
527 views

How do I calculate the ideal travel distance of the ball screw per revolution of the stepper or per step for the following hardware?

Question How do I calculate the ideal travel distance of the ball screw per revolution of the stepper / per step for the following hardware (I believe this is called the lead)? Background I have a pre-...
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2answers
2k views

Using a gearbox in reverse

Gearboxes usually have a reducing ratio like 200:1, which means that they take a high-speed input and convert it into a high-torque output. Would they work if I connected them in reverse? Is there ...
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2answers
34 views

Joining bronze gear to bronze shaft

I'd like to build a scale model catapult, and I'm building a tensioning/ratchet system similar to what is shown in this video: https://www.youtube.com/watch?v=yi4p8ZR4n28 The ratchet gear in the video ...
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1answer
58 views

Wierd faulty gearbox FFT

I am working with a public dataset (mentioned in few papers) of vibration measurements of broken and healthy gearbox under various load. Most of the measured channels posses the same parameters no ...
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2answers
3k views

Gear train with rack and pinion

I'd like to know if I can use a gear train to drive a pinion, and thereby increase the torque of the rack. If so, how does the gear ratio of the gear train affect the torque of the rack relative to ...
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3answers
48 views

How to calculate perimeter of spur gear?

I'm in need of some gears, but having them made by a machinist is very expensive so I'm planning to have them laser cut. Loads are reasonably low for any grade of steel, so I'm hoping it should be ...
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1answer
57 views

How should I lubricate my gears?

I am doing an experiment testing different types of gears, the gears are fairly small, with gear 1 being approx. 35mm in diameter and gear 2 being 45mm in diameter, and both are meshed together, there ...
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1answer
74 views

Adding the effects of two rods to move a single rod

I have to deal with a situation where I have two parallel and completely independent rods whose motion is dependent only on external inputs, and I want to add up the lengths traveled by each rod. My ...

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