Questions tagged [design]

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What CAD program is easiest for designing Ninja Warrior courses?

It would be nice if there was an easy to use CAD program with prebuilt parts such as trusses and ropes and mats, vertical wall... things that go in a ninja warrior course. Just so I can drag and drop, ...
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0answers
30 views

Detachable tubing connections (joints) for frame assembly

I am looking into fabricating a steel tubing frame that needs to be dis/assembled (applies to many larger furniture like bed, shelving unit, wardrobe, cupboard, cabinet, ...). What are the variants of ...
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1answer
27 views

Best solution to fix loose bolts problem, on delicate/ fragile surface?

Most common practice to fix loose bolts is using washers, but while using washers and tightening the delicate surface gets damaged, so what are better alternatives to fix loose bolts problem
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22 views

Simplifying the soda gun mechanism

I'm looking to design a push button mechanism similar to the soda gun where water is forced to pass through a single passage based on which button has been pressed. What are the different approaches I ...
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4answers
68 views

Why one big cargo ship is more efficient than 10 or 100 smaller ships?

Given the fact that small container ships are easier to manufacture than big container ships.. then why is it considered better to build bigger ships instead of many smaller ships? And to see why ...
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4answers
68 views

Rotation around an axis outside of the mechanism

I want to design a system of linkages that will allow me to rotate the green element around the blue point/axis without entering the red circle. The green triangle to go fully around the blue point. I ...
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49 views

What type to mechanical joint to achive Slide then Rotation motion

I have two parts (Green and red fixed) i want to connect them with a joint (Blue) that permit the green one to slide outwards then rotate. Side View (Right part) a simple pivot point doesn't work ...
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2answers
60 views

Looking for dropping servo mechanism idea

My friend and I have an idea to make prototype of vending machine. We need suggestions for making strong dropping mechanism. The idea is: The user orders X item. Let's take a can of cola for example. ...
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2answers
39 views

What function does this device perform better than a flat, horizontal bench?

I am curious to understand the engineering and design principles behind this device, which I will refer to as the half-assed rest, because it seems to be an inferior design of a normal chair or bench. ...
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2answers
55 views

How can propeller blades be made silent?

In particular drone propeller blades. I read that the noise we hear is the propeller compressing the air at the edge of it to produce a sonic boom. Is that true and is there a way to negate that?
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3answers
187 views

Mechanism for controlling the clamping force

I am working on upgrading a research project on wind energy. They are trying to measure the performance of wind blade designs in a small wind tunnel (i.e. their models are relatively small). What they ...
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1answer
37 views

Safety types and definition [closed]

I am searching for some Engineering terms but couldn't find any of the definition. Direct safety Indirect safety Warnings Thank you in advance
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1answer
414 views

What's the best way to design a joint with two fasteners?

When you're trying to design a relatively long joint with only two fasteners, what's the best way to arrange them? Since fasteners effectively radiate a circle of clamping force around them, what's ...
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1answer
44 views

What would be the best mechanism to rotate a plate from 0 to 15 degrees?

I'm designing a machine in a small university project that change position of a two-state gate. The two states shown in the Figure below are 0 and 17 degrees of elevation, correspondingly. The ...
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2answers
49 views

What is the difference between requirements and design specifications?

Working while employed at large companies, I was at times confused as to what was considered to be a requirement and how a specification differs from it. Upon reading more about it, I have discovered ...
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0answers
26 views

Using Density Correction Factors for Fans and Blowers

I've been researching fans/blowers and their use in pneumatic systems (particularly conveying systems), and I'm confused by the application of density correction factors. Let me describe a sample ...
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1answer
29 views

Help with scaling torque and forces?

I am currently designing a ground based digging drill, that hopefully will be accepted by a commercial entity. I am currently working on the preliminary design of the robot and am hoping to move to ...
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0answers
18 views

Limit state design/ LRFD of short steel columns

Why do we use the yield strength as the limiting strength in short column design when using limit state design. Why is the full capacity of the material not utilized (as is the case with beams when we ...
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1answer
91 views

How is linear motion achieved in this automatic blackboard eraser?

In the animation shown below what can be the mechanism used for this purpose? I know it can be achieved by using rack and pnion gear arrangement. But how are this set up arranged in classroom ...
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1answer
42 views

product to tackle problem of senior citizens of our society who forget to take pills due to Memory Loss [closed]

For a lot of senior citizens of our society, taking medications is a necessity. Although necessary,it can be tedious sometimes. More often, these patients forget to take pills due to Memory Loss. Is ...
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1answer
125 views

Mechanical/electronic chalkboard cleaning device to replace the conventional duster to clean the chalkboard

The chalk board duster which is used by teachers to wipe the chalkboard seems very agonizing for them. What new mechanical/electronic devices can be devised to replace conventional chalkboard duster ...
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2answers
115 views

Is design of “Budweiser's bow-tie shaped beer can ” feasible & unique from engineering point of view?

Is design of "Budweiser's bow-tie shaped beer can " feasible & unique from engineering point of view? Can there be a better design than it? Like the shape of can is inclined at ten ...
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1answer
38 views

Looking for specific bearing

I am new to mechanical engineering so I don't know the terms for different bearings. I'm trying to make a honey extractor. I have a rotating basket made out of stainless steel that is going a maximum ...
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1answer
26 views

Wood Dimensional Stability

Between Glue Laminated and steel plate sandwiched between two wood beams, which one is more dimension-ally stable?
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3answers
109 views

What is “reversal” in mechanical engineering drawing?

I've come across these terms "reversals allowed" and "reversals not allowed" in a sample drawing while reading a GD&T course. What exactly are these terms? What do they mean?
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1answer
35 views

Wind turbine that is efficiant from all angles [closed]

What shape propeller with a large surface are, would be best propelled from the wind from behind and from the side as well as the front while facing the sun? I am thinking a pinwheel, but maybe there ...
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0answers
41 views

What are the factors considered in the development of the video game controllers over the years? [closed]

What are the ergonomics taken into account in evolution of video game controller over the years.
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1answer
37 views

How is mechanism used in modern projector different from intermittent mechanism used in conventional one?

Do modern projector used for digital class works on same old conventional intermittent mechanism and blocking of light during change of frame. What is principal used in modern projector?
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5answers
2k views

Would a centrifugal flyweight governor system slow down the descent of an object that is free falling down to the Earth's surface? (Revised design) [closed]

I am wondering if rotating flyweights would slow down the descent of a object that is free falling down to the Earth's surface. Please reference the conceptual drawing below: This drawing is showing ...
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0answers
38 views

How much torque is needed to mix melted marshmallow with rice krispie?

I am designing a robot to make rice krispie treats! More specifically, I want to use a fork to mix the melted marshmallow with rice krispie. I am currently specing out the motor, and since marshmallow+...
4
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1answer
109 views

How the optical cd disc gets drawn in when we gently push it? what is the mechanism behind it?

We have seen CD drives that have slits. The CD gets drawn inside upon a gentle push. how the CD gets drawn inside upon a gentle push? How it's mechanism works?
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1answer
94 views

Automated Teller machine detecting fake bank notes [closed]

https://en.wikipedia.org/wiki/Automated_teller_machine Do ATM's detect fake bank notes and not accept / receive from customers giving them a "Fake notes detected" message on the screen?
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0answers
20 views

How to fix a shaft in position, vertically [duplicate]

I am doing a project where I have to mount a gear shaft with two bearings on either end (deep groove ball bearings) but I am worried that they may fall through the bearings during operation as the ...
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1answer
36 views

As a rugged and waterproof device, how does gopro dissipate heat?

I am new to designing rugged + waterproof products. I am curious about how to dissipate heat when the electronics are running and the ambient environment is even hotter. It seems like the mode of heat ...
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2answers
42 views

Vertical gear shaft support

I have a question regarding how are the vertical forces on a spur gear shaft are supported. I am currently doing my undergraduate (in final year) and have only dealt with gearboxes where the shafts ...
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2answers
50 views

Torque based bending on shaft

I wanted to see if the force acting at A (30 kN) would create a deflection from OB other than twist. In other words, would a force perpendicular to the axis of rotation cause anything other than ...
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1answer
39 views

Choice of Datum Features and Number of Datum Features

Consider a rectangular stock section with a dowel hole and other features of size (FOS) on it. The dowel hole serves to locate the entire part. Should my choice of datum features be what is most ...
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1answer
37 views

Switching a Circuit on-and-off In-step with the Rotation of a Drive-shaft (Mechanically)

I'm working on a project. The Salient part here is a drive-shaft connected to a bearing, onto which a simple circuit is mounted. I want to switch the circuit on every $π$ and off for the other $π$ of ...
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0answers
27 views

what is the difference between jblade, qblade, and xflr5 softwares?

I am working on a propeller design, and I've came through Jblade which helped me in the airfoil design, yet as I can remember, xflr5 can also do this... doing some internet search, i found that Jblade ...
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1answer
37 views

Geometric constraints on Planetary Gears

I would like to design a single stage planetary gearbox using standard gears. There appears to be three primary conditions to ensure the geometry of the gears will fit - correct center distance, ...
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2answers
35 views

How did OXO manufacture this colander with such intricate wall feature?

Here's my guess, but I would love to hear another perspective. I think this is injection molded. This colander has draft angles and the two mold halves use an intricate step-like wall pattern to ...
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0answers
18 views

Setup Invention Process in Engineering CAD Software

I need to develop a collapsible metal construction. I have a few specific prerequisites. Generally speaking, it will be something like a big construction toy, but not be a toy. It has the specific ...
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2answers
45 views

Reduce stress on holes

I have an aluminium bearing holder attached to one end of an aluminium plate as follows: The bearing holder is attached to the plate by two bolts on the bottom. The intended setup is to attach a ...
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1answer
68 views

How are the electronics and chips inside the microwave protected from the microwave radiation/energy?

Let's say I put in an endoscope like camera with the lens at the inside edge of the box and the wire behind metal sheet. Here's a mockup: Could use microwave reflecting or absorbing wrap to wrap the ...
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1answer
27 views

I need a roller setting where I input a 1 feet fabric and need it to be reduced and compressed about 9 inches and released back as 1 feet fabric

I have a requirement where I need to input 1 ft wide flexible 5mm thick fabric into a roller setting where my width is reduced to 9 inches and compressed and released back as 1 ft. I thought of using ...
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0answers
55 views

Technical term for loose drawers jamming more readily than those with tighter clearance?

A loose drawer or loose sliding parts in general jam more easily than ones with tighter clearance. There is a name for this problem but I can not remember what it is, and searching for "loose drawer ...
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0answers
40 views

How is motor torque related to capstan equation?

I know that capstan equation relates $T_{in}$ and $T_{out}$ as $T_{out} = T_{in}e^{u \cdot F_c}$, where $u$ is friction coefficient and $F_c$ is wrap (slip) angle. In my situation, the capstan is ...
2
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1answer
47 views

Cheap but durable design for a quick-to-assemble, portable globe?

This question has a bit of an arts & crafts / DIY flavour, but looking at those Stack Exchanges made me feel it fits better here. I have no background in any of these things, so apologies for my ...
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1answer
61 views

Could a Jacob's Ladder produce enough hot air for a hot air balloon?

I am curious to know if a Jacob's Ladder would produce enough hot air to keep a hot air balloon afloat, or in other words, that it could be a substitute for a standard gas burner used for hot air ...
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2answers
30 views

Conservation of Energy (NO PMM's)

A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist. My question is this. Why is this concept so hard to understand for many people? I ...

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