Questions tagged [gears]
The gears tag has no usage guidance.
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Calculating Minimum Gear Ratio To Lift Weight
I have a 337 watt motor, and want to lift ten pounds. What kind of gear ratio will I need for a gearbox I attach to this in order to lift the ten pounds at a constant speed?
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0answers
12 views
Arduino DC motor and gear system. How to keep gears inline and system stable?
I bought a kit that has DC motors and a lot of gears. I'm having trouble making anything. The main issues are:
How do you keep the teeth of the gears inline the way you set them up? Every time I turn ...
2
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1answer
36 views
How to increase maximum rotational speed limit of a reduction gearbox?
Reduction gearboxes made of machine steel gear have a maximum limit to prevent changing their physical properties (softening). They change their properties as a result of the temperature increase ...
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1answer
33 views
Understanding the torque of a motor/gearbox combo
Imagine a typical DC motor / planetary gear combos.
Is my thinking correct:
Say you have a 100 kg mass on a frictionless surface. The gearbox output shaft has a 0.10m arm with which you push the ...
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0answers
26 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
57 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
39 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
39 views
Performance of RC car under different gear ratio, measured data vs hypothesis
Assuming the driveshaft of the rear wheeled drive RC car follows the linear DC motor theory for stall torque and no-load RPM, also voltage supplied is constant and no inductance as well. Note: the ...
1
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1answer
36 views
Intuitive understanding of the common normal at the point of contact of 2 gear teeth
Consider 2 oddly shaped surfaces and pick a point on each of the surfaces. At the point considered we can always draw a normal to the surface. Now if the two surfaces are in contact at this same point ...
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3answers
95 views
Functionally Matching Gears (teeth count) in Planetary Gearbox
I wonder, whether an equation
$$R = 2P + S$$
should give a geometrically sound design, where $R$ is the tooth count for the ring; $P$, for the planets; and $S$, for the sun.
I have tried to model a ...
0
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1answer
30 views
Mini freewheel / overrunning clutch for stepper motor
I am looking for a mini freewheel, one that I could mount on a standard NEMA 17 stepper motor (or similar stepper). I want to use it with a pulley, such that it starts the motion of a wheel, which can ...
1
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1answer
43 views
Gear pump has backflow and does not stop forced flow
I have a "Micropump GB-P25.JVS.A" gear pump. I pump in the range between 100 and 500 ml/min up to a column about 10 cm above the pump level. The column is filled from the top and has a bottom outlet.
...
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0answers
49 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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1answer
179 views
What are positive drive gears? [closed]
Gears are called positive gears and belt drives are called negative drives. Explain in detail.
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0answers
43 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) ...
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1answer
67 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 ...
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0answers
21 views
Inversing shaft movement with planetary gear possible? [duplicate]
Assuming I have two shafts, both having the same diameter. One shaft is kind of the extension of the other (they sit on top of each other).
How could I make one shaft turn in the opposite direction ...
3
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1answer
77 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. ...
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1answer
40 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 ...
2
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2answers
37 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 ...
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0answers
36 views
Center distance and tolerance for worm gear pair
I'd like to use the following worm gear pair in my design:
Gear
Module: 1.5
Pitch Diameter: 30.1mm
Profile Shift Coefficient: -.018
Worm
Pitch Diameter: 25mm
I am trying to calculate the center ...
1
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1answer
99 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 ...
1
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1answer
86 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 ...
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2answers
57 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 ...
2
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3answers
98 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 ...
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0answers
20 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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1answer
110 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
...
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1answer
49 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 ...
4
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1answer
108 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 ...
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1answer
25 views
What is “error in action” in gears?
What is error in action? And why is it called error "in action".
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1answer
196 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 ...
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0answers
163 views
3 stage split planetary gearbox ratio
I am building a high-precision stepper motor with a reduction gearbox at its front.
For the gearbox, I intend to use a three stages split planetary gearbox in order to reach a transmission ratio of ...
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0answers
90 views
Derivation of motor shaft conversion load inertia
I'm looking for a derivation of this formula. If anyone could show me how to do it I'd be very appreciative.
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0answers
54 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 ...
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2answers
347 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?
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1answer
21 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 ...
2
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3answers
98 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 ...
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3answers
73 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 ...
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2answers
345 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 ...
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1answer
36 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 ...
2
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1answer
32 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 ...
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1answer
18 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?
3
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1answer
52 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 ...
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3answers
747 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 ...
2
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2answers
71 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 ...
2
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2answers
138 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 ...
2
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1answer
94 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 ...
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0answers
21 views
rotary damper in a gear train
Could someone double check this for me?
I have a rotary damper of 2Nm that is connected to a gear 25mm dia. and this gear is meshed with one of 50mm dia. Gear ratio 2:1
Just like using a torque ...
3
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1answer
70 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 ...
2
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1answer
51 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 ...
