# Questions tagged [mechanical]

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### How much force/torque act on a wheel of a vehicle when vehicle moves a constant speed and suddenly got a bump or jerk?

I am working on disturbance rejection technique in a vehicle of a wheel. Suppose our vehicle moves with a constant speed 15 km/h. Since roads are uneven in nature, suddenly vehicle got a bump or jerk. ...
220 views

### Why does the fulcrum pin of a band brake experience “double” shear stress [closed]

My machine design textbook states that the fulcrum pin of a band brake during braking is subjected to a double shear. How do you say it is subjected to a double shear and not to a single one. By ...
164 views

### How does a two dimensional elevator work?

If you watch this video, you can get a sense of how an elevator can operate in two dimensions. But, what I can't figure out is how it is driven. If you consider a conventional elevator, there is a ...
50 views

### Hinge or similar that breaks at a certain change in acceleration?

Suppose I have a rope that is capable of lifting 100 Kg without breaking. But I would like the rope to break if it is exposed to a sudden change in acceleration (jerk). So if the rope was lifting 10 ...
119 views

### timing pulleys setup for children's pedal car

I want to convert my son's pedal car to electric. The car is meant for 3-6 year old children. So far I got the following: 50W, 3300 RPM electric motor with 8mm round shaft (no keyway or shaft groove)...
46 views

### What mechanical design will shake a gravel screen box back and forth not up and down

Looked at this gravel screen and its a different design wondering how the shaker box moves sideways directly connected to the small gas engine, How or what mechanical connection would be involved? ...
204 views

### Vehicle Train Towing [closed]

Why can I not tow 50,000 lbs (40,000 cargo and 10,000 Trailer bed) using multiple pickup truck each individually capable of towing 30,000 lbs? I was told that the towing capacity does not "Add up" ...
3k views

### Mechanical advantage of the 3-ring release system

I'm quite curious about the 3-ring release system used in parachutes, as described in this Wikipedia article: https://en.wikipedia.org/wiki/3-ring_release_system I wonder why is this system so ...
47 views

### Scanning and modeling my personal vehicle for aerodynamic simulation

I have this pickup truck that I love dearly. I often change the aerodynamic configuration of the truck when I use my camper shell, or roof top tent, etc. Is there a reasonably easy way to create a ...
107 views

### Which frame is optimal for children's bicycle trailers? tubular or rectangular frame and why? [closed]

I need to construct a 3D wooden bicycle trailer for Kids. The weight of bicycle trailers must also be light! The Frame should be made of wood. what criteria should I use to construct a Frame,Children'...
104 views

### Z-axis auto adjusting fixture device

I am looking for a mechanism that would allow me to support a fixture attached to a 3-axis motorized stage. I have attached a picture of my current design. I trying to design/incorporate some sort of ...
949 views

### How to calculate the gear ratio of planetary gear?

I saw this picture today: They give an ratio of 5/352. I think this is not possible with a simple gear. Maybe the upper sides ratio is the cause for it. Which formula do I need to calculate the ...
100 views

### How to make a clamp for this motor to move it in two directions?

I'm working on a disc brake balancing machine, as shown below this is a belt pulley drive and for alignment purposes I want motor to be able to move vertically as well as inwards outwards (to tighten ...
118 views

### Temperature dependent electricity consumption of HVAC System

I am trying to figure out if there is a decrease in electricity consumption of a cooling unit if the ambient temperature decreases from 35°C to 20°C. More detailed, a company is planning to install an ...
103 views

### Collecting Rainwater off a Domestic Roof for Flushing Toilets [closed]

I am working on a project for an Environmental Engineering class. Our concept is a system that collects rain water for use in toilet flushing, i.e. requires minimal filtration. I have no experience in ...
268 views

### Explain tolerances in technical drawing

I'm not a mechanical engineer and am not used to looking at mechanical drawings. I'm trying to understand what these tolerance features mean. There is a positional tolerance feature, which ...
329 views

In one of my project, I need deformation gradient or displacement gradient for some elements in my model that made by ABAQUS software and I can't find it directly, any suggestion or help would be ...
120 views

### How did the snifting valve in Newcomen's steam engine work?

Its function was to expel the air that came inside the cylinder along with the steam to prevent the engine to become "wind logged". Since the valve was non-return, how did Newcomen stopped steam from ...
72 views

### Is there something that can expand to 12 times it's size on the x & y axis (not concerned about the z), and can still return to it's original shape?

I posted this over on physics, they suggested I cross-post it here. I've been looking for a solid square (non-pourus) that can expand to 12x it's size and back again. This needs to grow and shrink on ...
53 views

### Mechanical Engineering- Modeling contact in Abaqus

I have simulated a 2D model in Abaqus which indicates 2 main part, first a sector that represent as wheel and, second a rectangular that represent rail. the wheel and rail are in contact and wheel ...
38 views

### Planetary gearing

It is said when a planet gear revolves around a fixed sun wheel, the number of revolution it makes might be more than what appears to be logical. For example, if the planet and sun are fitted with 20 ...
7k views

### What is Saint Venant Principle?

I am having problem with the application of Saint Venant principle.I have heard that quite often we use that knowingly or unknowingly.I would be very greatful to anyone who would explain this very ...