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TL;DR: It depends, but probably not You might argue that "all 15 samples are within spec, so the supplier should be approved". Not so fast: depending on the parameters of your full production run, the 15 samples may or may not be statistically significant. There are numerous calculators online to do these calculations; I used this one. A good resource for ...


7

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. Operator initially only has to see that they are one layer deep. Use of multiple belts runing side by side at different speeds and textures may be able to ...


5

What is the cause of this static charge in the grinding process? My thought is that the coffee grinder is essentially acting like a Van de Graaff generator. Since the coffee maker likely has a plastic frame, rests (most likely) on rubber feet, and the electrical wiring (most likely) is insulated from the grinding mechanism, you have the potential for ...


4

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 into the optical gate, stops the film there for a brief instant while the light shines through it, and then pulls the next frame of film in, stops it, etc. This ...


4

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 become colored (red, green or blue). There is a mirror for each pixel and it direct light to the projecting lens or to an absorber depending on if the pixel ...


4

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 design emphasized the iconic bowtie and updated its appearance giving it a eye-catching look, providing good holding experience which was easy to grip. After can ...


3

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 sequestering would be an issue. Most people don't really understand the relationship between manufacturing, logistics, and assembly. They probably think they ...


3

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 smooth shaft type pins, there are longer bolts with only the end portion threaded, leaving the longer shank smooth. Off with the heads and you're set. ...


3

The average and standard deviation from the above sample set are: Average ($\mu$): 4.754V Standard Deviation ($\sigma$): 0.142368 Mean: 4.74 USL: 5.5 LSL: 4.5 C$_{p}$ : 1.1706 C$_{pl}$: 0.5947 C$_{pu}$: 1.7466 C$_{pk}$: 0.5947 Equations $\text{Pr}(\mu - \sigma \leq x \leq \mu + \sigma) \approx 0.6827$ $\text{Pr}(\mu - 2\sigma \leq x \leq \mu + 2\sigma) ...


3

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 seems to me that increasing the pressure in the top side will increase the seal tightness but check with someone that uses these things. (I'm an electrical engineer....


2

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 actual sports, you're allowed to touch the bar, as long as it doesn't fall. 3) You may be affected (put-off) by the presence of a physical bar in a competition,...


2

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 way to increase the force of friction is to add weight. As you probably know the friction equation is $F=\mu N$ $(F=$Friction Force, $\mu=$friction coefficient, $...


2

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 are equal to the gains. Estimating the losses is hard, if not impossible in practice. That is because friction of your system is extremely hard to predict. ...


2

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 some of your examples: Computer power -assuming you mean desktop little movement ambient temperature low chemical hazard. Kettles / toasters - temperature risk, ...


2

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 mold halves must be ensured. For your listed considerations, it doesn't appear that a wood mold, especially one made from hardwood would be a problem. With ...


2

I agree with What Trevor said in a comment. You specified 5V ±10% (4.5-5.5 V) and that's what you got. I don't see the problem here. All the samples you got are within spec. There may be other reasons to not use this vendor, but samples failing to meet specs is not one of them. However, first article samples don't tell you that the vendor is OK, ...


2

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 below the melting point. Hardware failures do happen, and I've personally seen a runaway hot plate almost melt an unattended plastic container (full of alcohol!)....


2

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 $ 10 ( US) last I looked . Search aquarium ,pond, or fountain pumps on the net ,( I often find what I want at "Big Als" - Canada).


2

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 you hold it in your hand to when you discard it. It has been so successful that has made its way here even. Seems they have surmounted the manufacturing ...


2

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 are two common approaches: Water Vacuum The water approach is what most would be familliar with. It has been used for ages with the usual handheld sponge. ...


1

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/systems that may need to be revised: Parts that were made without drawings, for example by match drilling, or "freestyling" Parts that are not easily obtainable in ...


1

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, actuators, sensors, feedback displays. They are also reasonably similar in the size of devices they make - this sort-of makes sense from an abstract perspective, as ...


1

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 out of hurting strangers, disgruntled employees, etc.


1

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 (even when they operate through a throttle servo). Alright, I'll suggest two methodologies, both of them are applicable to many scenarios. The Flexible Way The ...


1

The solution you have suggested will not be waterproof for long. The reason is that, if you pull on the cable it will stretch and thin very slightly. This is enough to break the seal. If you can make the space, a cable gland is the best option. If you can't, and O-ring seal is probably the next best thing. Make sure to use a thick o-ring with some ...


1

I would use three(triangulated) very sharp tip toes, stainless steel conical points so that they dig into the asphalt a little bit with a little pressure from the installer :-) I don't know if they have them anymore, but track and field shoes use to have threaded conical spikes with the shoe soles having threaded inserts to receive the spikes. You could use ...


1

What you have have posted I believe is Bill of Materials that includes Assembly level representation. Below is the complete BOM which I believe is the one you have partially referenced. Click on image for a larger version of the image. So if you were to create a BOM from the attached spreadsheet I would remove following line items and to create the BOM. ...


1

For an arbitrary length, I believe hot-forming. Feed a rubber band into a system that runs it along a roller heated past the $T_g$ of the rubber that has the desired imprint etched into it, then cool it down as it leaves the forming roller. The actual temperatures, tension values for the band and pressure required are up to you to figure out once you settle ...


1

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 is active. Two scenario to look for is as follows. Is the patent currently maintained by the author, if the author is not maintaining the patent, then you will ...


1

the two main methods of making hard cases for electronic gadgets are 1) injection molding and 2) blow-molding, vacuum forming or sheet molding (these have similarities as described below). Injection molding is the squirting of molten plastic into a cavity in a metal mold, which is then opened up to remove the finished part. It is used when the part has to ...


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