Questions tagged [gears]
The gears tag has no usage guidance.
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20 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 ...
1
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1answer
37 views
Internal Geneva drive calulations/design
So there is a lot of information out there about designing an external Geneva drive, but I can't seem to find anything about designing an internal one. I'm trying to design something similar to this (...
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0answers
20 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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14 views
Source for plastic rack gear strips
I'm trying to find a source for this type of plastic rack gear:
This image came from this youtube video.
I can find short pieces of straight rack gear on ebay, but nothing like this.
It appears ...
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0answers
29 views
How to design a coaxial 1:2 gear without reversing direction?
I am trying to design a gear that has a 1:2 speed ratio (input:output). This design is very limited in space and for simplicity and space savings requires the input and output shafts to be coaxial.
...
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0answers
41 views
Finding the right worm gear for a wormscrew that didn't come with technical specs
I bought a CNC linear rail guide slide from ebay(seen here). I'm trying to find a proper worm gear to mate with the wormscrew. There is no technical specification that came with the kit however on the ...
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3answers
56 views
Is there a cheap way to get gears
Is there generally any cheaper way to get a bunch of gear wheels. I've been to some local companies who specialize in gear production and the price is always somewhere in the range 100-150 USD for a ...
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0answers
25 views
Is it possible to mechanically switch between rotational directions of an output shaft?
I know that it would not be possible while the input is still rotating, but is it possible to create a gear box or chain assembly that can change the direction of rotation?
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26 views
Rack pinion possible?
I want to lift a weight of about 300 kg suspended to a rack of width 15 mm. This weight will be lifted using a spur gear pinion with OD not more than 8 mm. The material will be SS 304.
Weight will ...
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0answers
33 views
Gearhead & 'teeth-track' to drive rotation of ringed encasement?
I am not an engineer, so apologies if this one is a bit of an ill-thought out...
Can anyone show me an example of something like the following scenario:
A small stepping motor driving rotation of a ...
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1answer
55 views
The torque I need to lift the device and correct gear ratio for the device to be as fast as possible
The device have to climb a pipe vertically. I have a DC motor with power rating 21.2 w, output speed 13360 rpm and maximum output torque 154.4 gcm.
My device is 1 kg and I have wheel with 0.012 m ...
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0answers
41 views
Need help picking motor to wind a spool
The application is a motor attached to a spool to wind/unwind window blinds.
I would like to operate the motor at $v=0.2\text{ m/s}$, with a max load of 1.5 kg.
I need to know the ideal diameter ...
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1answer
44 views
How can you calculate the torque and speed of a single output gear being driven by two different input gears?
I am building a gearbox that needs to lift around 50lbs very rapidly. I already have a single planetary gearbox that does the job in around 7-10 seconds, but I would like to cut this time down ...
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0answers
12 views
What is the tolerance on gear pitch?
I'm trying to make a gear to mesh with a motor shaft that I bought online, but it doesn't give any information about the pitch or diameter. When I measured the diameter and pitch of the motor shaft, ...
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0answers
24 views
Planetary Gearset for Power steering
I am trying to create a power steering system for a go-kart project. In order to switch off between remote control and human control, I plan on implementing a power steering system with a planetary ...
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1answer
33 views
How to get precision with a small gear?
I want to be able to precisely rotate a item. For this I have positioned the item on top of a very large gear. It is driven by a smaller gear. When the item is in the correct position, I will lock the ...
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1answer
69 views
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?
2
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1answer
50 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 ...
2
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1answer
43 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
27 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
63 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
50 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
57 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 ...
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1answer
38 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
239 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 ...
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1answer
39 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 ...
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1answer
62 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
105 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
333 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
45 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
74 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 ...
3
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1answer
119 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 ...
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2answers
40 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 ...
1
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1answer
118 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 ...
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1answer
115 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
60 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 ...
3
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3answers
210 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
53 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 ...
2
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1answer
163 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
...
1
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1answer
59 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 ...
3
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1answer
117 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 ...
0
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1answer
34 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
398 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
91 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
558 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
23 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 ...
3
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3answers
129 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 ...
3
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3answers
89 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
469 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 ...
