6 votes

What can be the mechanism used in devising a machine that can arrange the dishes properly to make the cleaning faster in the messes/hotels

Some of this depends on how tough the dishes are. While taking a lot of room, I can see possibilitiles in a conveyer sorter. Concept one: Dishes are dumped onto a conveyer that is on a sideways slant....
Sherwood Botsford's user avatar
5 votes

In which file format are technical drawings saved/stored? How can the data be exchanged between other software?

As your tags indicate AutoCAD, the answer is going to be directed in that direction. Data eXchange Format (.DXF) files are created by the source software. The receiving software has to permit import ...
fred_dot_u's user avatar
  • 7,090
4 votes

What is the reason for the intermittent motion and blocking of light during change of frame in Conventional projector?

if the film was fed smoothly past the lens and bulb, your eye wouldn't see a series of pictures- all you'd see would be a continuous blurry smear. So instead, the projector pulls one frame of film ...
niels nielsen's user avatar
4 votes

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

Modern digital projector use a technique called DLP(digital light processing). They use an array of micromirorrs in order to point the white light source(often a bulb) that goes through a filter to ...
Alberto Brambilla's user avatar
4 votes
Accepted

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

Budweiser made some design modification to regain its marketing and branding endeavours which had seen huge decline in sales threatening Budweiser's status as America's Best selling beer. The new ...
Rajakr's user avatar
  • 338
4 votes
Accepted

Why Cups are Frustrum-Shaped

If the big end of the cone is upwards, then increasing your pinching grip on the cone would tend to slide the cup upwards, preventing it from falling. If the big end is downwards, then increasing your ...
niels nielsen's user avatar
4 votes

Why Cups are Frustrum-Shaped

TL;DR: it is due to the effect of a mechanical edge. When you are holding a cup pressure is exerted by the fingers (essentially). Like the following image. Pressure is always normal to the surface. ...
NMech's user avatar
  • 24.3k
3 votes

Why automakers are/should be making medical ventilators?

I think you could hack any poppet valve engine block to create a rapid pressure swing adsorbtion machine, but better to start with a block designed as a compressor in the first place. Lubricating oil ...
Phil Sweet's user avatar
  • 4,755
3 votes

Designing a "ratcheting" spinning wheel with ferrous metal bits

Many ordinary bolts and nuts are of magnetic steel, rather than stainless. If you have no complications with the threaded portions, you can cut away the heads to have your pins/dowels. If you require ...
fred_dot_u's user avatar
  • 7,090
3 votes
Accepted

How to design internal wall separation in the PVC tube to use it as a water tanker

Consider the use of a double-lip seal. Figure 1. A double-lipped seal in the false base of the tube. This can then be inserted from the top of the tube to take advantage of the tapered edge. It ...
Transistor's user avatar
  • 10.8k
3 votes
Accepted

How does the Nest Learning Thermostat bezel rotate without bearings?

Just prior to this point in the video you can see that the display has been inserted from the front and this portion will be added from the back and screwed in. All that is required is to ensure that ...
Transistor's user avatar
  • 10.8k
2 votes
Accepted

Feasibility of product idea

It's certainly feasible. I don't know if it has been done. I don't think it's a great idea, for the following reasons: 1) What would the athlete be aiming for? It won't be as visible. 2) In the ...
user57709's user avatar
  • 144
2 votes
Accepted

Why are CO2 analyzers much more expensive that CO detectors?

Part of the answer is that CO is chemically reactive, while CO2 is not. "Cheap and simple" CO sensors either mimic the reaction of CO with the oxygen-carrying chemicals in the bloodstream and detect ...
alephzero's user avatar
  • 12.5k
2 votes

Choosing the best type of portable cord for a consumer electronics product

The choice of cable is down to the environment that the cable is working in. Designers will be looking at mechanical abuse - by accident or not, temperature, chemical hazards etc. So, taking your ...
Solar Mike's user avatar
  • 15.8k
2 votes

Which design to maximize friction for a device standing on concrete?

If you have a rubber that you believe has the best coefficient of friction possible then it wont matter too much how it is shaped unless you need to deal with water or mud like a car tire. The best ...
Brice Edward Furr's user avatar
2 votes

When designing scissors, how do you design the blade geometry to ensure good cutting capabilities?

Before designing any scissor the crucial details common in every scissor must be covered as noticed in home scissors the following description are common- The insides of the scissors are not flat. ...
Harshita ghildiyal's user avatar
2 votes

How do you calculate the required power of a disk turbine (Rushton turbine) to rotate a fluid at a given speed?

We have a fair share of questions about how to calculate maximum speed, but the fact remains that this is extremely hard calculation to make. See a mass will continue to accelerate until the losses ...
joojaa's user avatar
  • 3,587
2 votes
Accepted

Can wooden mold be used for blow molding?

You will have some of the same considerations of creating a mold when using wood as when using metal. Underhangs/undercuts are to be avoided. Corners are to be radiused, no sharp edges. Alignment of ...
fred_dot_u's user avatar
  • 7,090
2 votes

How to design internal wall separation in the PVC tube to use it as a water tanker

For such a small vessel containing only water : A submersible pump would seem to solve all your problems. There are hundreds to choose from depending on capacity. These pumps start pricing around $ ...
blacksmith37's user avatar
  • 6,144
2 votes

Safe temperature thresholds for #2 HDPE and #5 PP plastic

Generally I would recommend against heating a plastic container with a resistance heater (like a hot plate or mug warmer) unless you know for a fact it has a hardware shutoff that will kick in well ...
realityChemist's user avatar
2 votes

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

A merchandise container design is a fusion of art, marketing, branding, nudging public opinion, and many more factors. This design is bold, exciting, and stands out from the shelf in the store to when ...
kamran's user avatar
  • 22.4k
2 votes

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

There are already comercial products like this. They exist primarily in the asian market. They usually consist of a vertical machine which moves along a rail at the top and bottom of the board. There ...
totalynotanoob's user avatar
2 votes

Product Design Scaling Issue

No, it is not that simple. Are there clearances or running tolerances? If there are then they have to be adjusted. Imagine a shaft of 15mm in a hole of 18mm, that is a gap of 3mm (1.5mm per side. Now ...
Solar Mike's user avatar
  • 15.8k
2 votes
Accepted

Why Do the Fingers in Mechanical Pencils Fly Out?

The plastic fingers are moulded in the open position. During assembly and operation they are compressed. I imagine that the fingers are moulded so that with the ring in the position shown they are in ...
Transistor's user avatar
  • 10.8k
1 vote
Accepted

From advanced prototype to low-volume production

I believe your primary goal when transitioning from single prototypes to small batch production should be to improve manufacturability, and ensure that your design is scalable. Examples of parts/...
Drew's user avatar
  • 1,931
1 vote

Why automakers are/should be making medical ventilators?

Automotive manufacturing encompasses a wide range of types of devices, many of which are broadly similar in terms of their structure and function to medical devices. e.g. processing electronics, ...
welf's user avatar
  • 488
1 vote

Why do Nescafe's (and others'?) instant coffee jars have an inner seal with no "grip" for easy removal?

Maybe this is actually what they design it for: to show immediately if someone tampered with the seal. Big brands have to be prepared for acts of arson, sabotage, lunacy, sick people seeking pleasure ...
kamran's user avatar
  • 22.4k
1 vote
Accepted

What are the essentials of a good PRD (product requirements document) for a new mechanical device

Before we start, just a word of caution that an engine is not only a mechanical device, they come with their own controllers (FADECs), and most of the time they have to integrate with some software (...
Gürkan Çetin's user avatar
1 vote
Accepted

Patent for product I designed

The patent of interest is currently in application stage. Review the marking in the below image. In general from an engineering product design stand point the first to investigate is if the patent ...
Mahendra Gunawardena's user avatar
1 vote

When designing scissors, how do you design the blade geometry to ensure good cutting capabilities?

Yes, there is a gentle curve (not angle ) built into the blades, designed to counter the small play in the hinge. This curve holds the cutting edges close together but at the same time it should not ...
kamran's user avatar
  • 22.4k

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