Questions tagged [design]

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Automated Teller machine detecting fake bank notes

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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27 views

Capturing slow motion using Smartphone camera devices

Is it possible to capture slow motion recording using Smartphone devices camera app - video recording feature? Example : Spinning top revolutions per minute. If Yes, How? If No, Why?
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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
32 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
34 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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11 views

Any idea on how to increase negative camber when doing high-speed turning (Baja design)? [closed]

What are some ideas of suspension design that can increase the camber in turning?
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2answers
45 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
36 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
35 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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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
28 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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Designing a positioner or a lift-column with fine positioning to a target quota and fast retraction

I am developing a system for positioning an object to a variable target quota. I am trying to find a solution that allows a fine positioning to the target quota and then a fast retraction to the home ...
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2answers
32 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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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
43 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
57 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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53 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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39 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 ...
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1answer
45 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
59 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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0answers
24 views

WEC linear inputs

I have seen some designs being made for linear generators for WEC(wave energy) applications. A buoy driving a shaft. But what if the shaft inside was a rack and pinion? If you converted the ...
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2answers
35 views

Does the rack for a rack and pinion often have or need to have the involute profile?

I am looking at designing a rack and pinion system that will be laser cut out of some plastic. While the cad system that I am using has a spur gear generator, I was looking at the design of the rack ...
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1answer
27 views

Why rotation factor of bearing for inner ring is 1 and for outer ring is 1.2?

V is a rotation factor to account for the difference in ball rotations for outer ring rotation vs. inner ring rotation. V = 1 for inner ring rotation V = 1.2 for outer ring rotation From Shigley's ...
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4answers
104 views

When an elevator has two buttons next to it, ^ and v, what do they actually mean?

Both as a kid and as an adult, I've encountered elevators lined up next to each other, or single ones, which have two buttons on each floor (outside of the elevator): ...
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0answers
26 views

Permanant extension for Fastener

I have a fastener with an accessibility problem. At the time of installation, the fastener is at the bottom of a crowded box with obstructions varying stiffness (Metal Plates and harnessing). It is ...
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2answers
59 views

Driving a lead screw using a universal joint

I have some issues regarding a lead screw. It's used as the main driving system for a scissor lift which requires about 2Nm torque to operate. This is the exact part if it matters: https://www....
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1answer
25 views

Where can I get design specifications for phones?

I am designing phone cases for 3D Printing. I am fairly new to the field, however I cannot find design specifications for any phone at all, i.e. exact measurements for the positioning of cameras, ...
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0answers
41 views

What screw to use with 1.8mm thick countersunk brackets?

I have a few brackets that are 1.8mm thick with 4.5mm countersunk holes like this: The countersunk machine screws that I've found have head heights of at least 2.2mm (some 3.2mm). This is taken from ...
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1answer
45 views

Stirling Engine Cooled Engine

Could a Stirling Engine replace the cooling system of an engine? Instead of having a clutch and fan attached to the main drive shaft to cool an engine, could a Stirling Engine and clutch share that ...
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0answers
27 views

Design of fan pipe for propelling glitter

I am trying to create a prototype for a glitter shooting mechanism. It is worth mentioning that I have no experience with mechanical engineering or fluid dynamics. I think the below image describes ...
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1answer
32 views

Shaft Design for Motor Test Rig

I want to design a shaft for a motor test rig. The motor and generator are 48V and 1.5kW and the maximum torque produced by the motor is 18Nm. RPM varies from 2900-3100. What shall be my next steps? I ...
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1answer
30 views

Bendable flaps on sheet metal

I'm trying to cut some bendable flaps on aluminium sheets for hooking/clipping onto some fabric. The flaps I have in mind look like this: Are these common features? Does anyone know the geometry of ...
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1answer
44 views

Why HMMWV's lights aren't located at the edges?

Hummvee has front lights located far from edges, closer to each other. That makes it harder to see edges of the vehicle in the dark.
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1answer
149 views

Could a bolt this size actually be used on a project?

could there ever be a structure that would require something like this?
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1answer
17 views

Purpose of normalization of Jacobian in a parallel manipulator

I am currently studying a robotics paper, where a normalized frobenius norm of a matrix is calculated as part of determining the condition number of the corresponding linear system of equation: $\...
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1answer
54 views

Designing PVC structure

I am an electrical engineering student that wishes I could have taken some civil engineering courses. Anyways I'm trying to design a pvc structure that I will use as a somewhat complicated room ...
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1answer
29 views

Designing A Freely Spinning Object

I'm doing a project that involves spinning up a (roughly) 2.28 kg object to 5000 rpm (via a DC motor) and then letting it continue rotating under its own influence (without any more input from the ...
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1answer
28 views

Predict egg drop outcome in random container

What elements affect the outcome of a raw egg drop in a random container? I’ve considered friction, mass, size of container, size and type of padding. Are there other elements?
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2answers
47 views

Design automation using fluid dynamics simulations

I have a question about design automation or generative design. There is a company that creates pumps. Their work-flow is following: 1) create design of a pump using CAD 2) create mesh for ...
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2answers
1k views

SOLIDWORKS - 3D Sketch of Trombone

My task is to create a 3D Sketch of a trombone like the one below My professor recommended defining the points 1-4 and putting a spline through them. I did that, but my resulting design looks weird. ...
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12 views

Design concept, how to power a guage?

I have a 12V battery that I want to monitor using a fuel gauge IC, should the fuel gauge be powered by the 12V battery? Or something else? (can you please provide an example if so?)
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1answer
20 views

I just learned about signed magnitude ,1's complement and 2's complement representation and I want to make sure that I understood them

So if I have the number 17 ( 8 bit code), the signed-magnitude representation is : 00010001 For -17 : 10010001 For 1's complement 17 = 00010001 For 1's complement -17 = 11101110 For 2's complement 17 =...
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2answers
86 views

Why rectangular windows are so common?

Most of the windows in our rooms are mostly rectangular. Why don't we chose any other shape like circle, triangle or trapezium? Does it affects airflow through room? Is the reason is that they look ...
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1answer
22 views

what impact does drop height have on powder segregation?

In the pharmaceutical environment, the drop height from the hopper to the area where it collects must be minimized. Tubes can be used to minimise the height. I know that it affects powder segregation. ...
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25 views

N2O/Kerosene Rocket Fuel

I am interested in building a small liquid fuel rocket and I have decided to use nitrous oxide and kerosene as the oxidiser and fuel respectively. I would like to know if anyone has any advice ...
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1answer
87 views

Buying Liquid Oxygen in Small Quantities [closed]

I am trying to work out costs and order parts for a small liquid fuelled rocket I have designed. My oxidiser is liquid oxygen but I can’t seem to find anywhere to purchase it on the internet. Does ...
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2answers
66 views

Designing a loaded voltage divider?

I was wondering how to design this circuit in depth, since I have no idea what to do.
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0answers
23 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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