Questions tagged [manufacturing-engineering]

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1960s coloring in manufacturing of fabric and plastic

I'm a art historian and would like to know why, in the 1960s, clothes and plastic products seem to have come in limited colours (e.g. white, yellow, red), whereas the 70s saw for instance orange, ...
Luk Vaes's user avatar
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What are typical manufacturing error rates?

In the manufacture of metal pieces which require at least moderate precision (say, ball bearings, or valves, but not roofing nails or door hinges), what is a typical error rate? I only need an order ...
John Meyers's user avatar
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Fuel cell power output

I've spent innumerable time over the years looking for commercially available hydrogen / oxygen fuel cells that might actually be usable in one project concept or another. The best I've ever managed ...
Slartibartfast's user avatar
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Manufacture of High Temperature Superconductor Circuit Trace

How would you go about making circuit traces out of high temperature superconductor (HTS)? Low temp superconductor traces have been made with pure tin, lead-tin, etc. But those materials are much ...
16toron's user avatar
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Electrical Charges

I have been doing some research on different textile materials and electrical charges. If I wanted to change a negatively charged material to a positive one, would that be possible? Thinking I could ...
HDrum's user avatar
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How is this metal, hollow sphere manufactured?

I just came across this sculpture and am really interested in knowing how it could even be done? I thought that they put 2 hemispheres together but there isn’t any weld lines- is there any other ...
JJonah's user avatar
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Helical inserts on aerospace parts work intermittently

I work at a machine shop with high-volume parts and a lot of threaded holes. Common sizes are 1/4-28 STI and 10-32 STI. Every hole gets a helical insert. We have always had major issues with the 1/4-...
Woody's user avatar
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How are gauge blocks (slip gauges) manufactured?

So I can use the 3 plate method to make some really flat surfaces. I can then use one of my surfaces with a surface gauge to make a block with parallel faces. What's not clear to me is how gauge ...
HJCee's user avatar
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Circularity symbol with datum?

I am trying to interpret a technical drawing that has a datum attached to a circularity GD&T symbol. This page says that Circularity never has a datum reference. But this is a technical drawing ...
tar's user avatar
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Price of e-beam evaporator [closed]

I'm trying to find an accurate price estimate for an electron beam evaporator for a research project. The intended application is for use in large-scale manufacturing. How does one usually go about ...
anfjnn's user avatar
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How to determine the effect of manufacturing variability on assembly of items

Any help is appreciated. Below are some details The product has around 20 different components (including ones manufactured to spec, fasteners, off the shelf, consumables, etc.) Lets assume the ...
Karthik's user avatar
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Fixing center distance of worm gear

For a worm gear setup in a metal casing, is there a way to fix the center distance between the worm and the worm gear being too far away other than scrapping the casing and make a new one? Reference ...
Thalva's user avatar
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How does resistivity affect the susceptibility of a steel alloy to induction heating?

For context, my question is related to the use of heating to elongate studs for casing tightening and loosening. In turbine casing assembly, in addition to torquing the nuts, studs have holes drilled ...
George's user avatar
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Which pilot hole is better for helicoil insertion, a hole with cylindrically flat surface or a hole with cylindrically tapered surface

When it comes to helicoil insertion, the choice between a hole with a cylindrically flat surface and a hole with a cylindrically tapered surface depends on several factors. These factors include the ...
Shryas's user avatar
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How to determine the performance index M for the outer vessel of a vacuum bottle? Need help with objective and constraint selection (Ashby diagrams)

I'm reaching out for assistance and advice regarding a problem I'm encountering in my thermal bottle analysis. I have been attempting to determine the performance index M but facing significant ...
Valentin Prezti's user avatar
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I'm wondering if the parts I have ordered to be vacuum casted and made have instead been made using 3D printing

The reason why I'm asking this in the first place is that I have observed striations on the parts I have received. I was under the impression that vacuum casted parts would not have striations that ...
Tarasvin's user avatar
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Does anybody know anything about this patented, late-19th-century process for producing white lead?

I debated on whether to put this question in the History or Engineering Stack Exchange. Ultimately, I decided on the Engineering Stack because I believe the people on this site will understand the ...
Curious Layman's user avatar
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1 answer
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'Know how' requirements for CNC / lathe manufacturing for open hardware projects [closed]

I've been asked to peer review a paper where the authors claim to be presenting an open source hardware item that is to be manufactured of aluminium using "CNC milling machines" or "...
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Simulation modelling of ATM machine

Today I built my First model with Anylogic simulation software on ATM simulation So ATM is basically here a delay element, which takes delay time parameter as triangular( 1.5, 2, 3.5 ). My idea is I ...
Rajakr's user avatar
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Simulating production of a product by a machine

I'm a beginner and trying to learn simulation modeling. My aims for simulation includes; A firm receives 5000 orders per week. 120 products are manufactured in an hour. The machine runs for 4 shifts ...
Satya's user avatar
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Potential Problems of Excessively Hard Shaft

Will there be any issues if we make the shaft too hard? Hardness being a surface property may prevent surface scratches and wear, could it lead to any problems in general?
Max's user avatar
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Skid plate manufacturing detailed Schematic

I need to make a skid plate for my vehicle, Nissan Xtrail T31 Is there a site where i can get detailed manufacturing sheet for my specific car model ? The schematic should include detailed dimensions ...
salimsaid's user avatar
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I’m Building a Tower…

I’m contracted to hang 4x 112 lb wind generator on the top of 40’ articulating poles (1 ea.). For aesthetics it have to use a single post tower and powder coat bits of it to look good (REALLY?) What I ...
LeGamin's user avatar
1 vote
2 answers
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Ideas for running 2 gas engines to 1 shaft with pulleys

First time posting, but love the forum. Hopefully this hasn't been asked before. I could only find the question in relation to electric, not gas engines. I own a pressure washing business, and my ...
Davidk's user avatar
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"Box generator"-like software for laser cutting this shelf from MDF

I'm thinking of building this shelf out of cheap 1/4" thick MDF: Now knowing how slow I am in the most basic of woodworking, I want the job to be speedy & easy. So I decided laser cutting it ...
Tempus Nomen's user avatar
1 vote
1 answer
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How are sealed bearings assembled?

Sealed bearings are a common component on modern bicycles. Even if you take off the plastic covers of sealed bearings, the ball bearings inside will not fall out. How is such a part assembled in the ...
Sam7919's user avatar
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1 answer
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Improving O-Ring/flapper valve injection mold ->non-engineer

I make specialized flapper valves that are similar to O-Rings. The current model uses aluminum sheets as base disks that adhere to the rubber (2 part urethane). The rubber is poured into the waxed ...
Lilly Whelan's user avatar
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1 answer
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What is the effect of lateral friction on the specimen shape

During compression test lateral friction occurs on the lower and upper surfaces of the specimen how does this affect the final shape of it and how do we reduce this effect?
Youssef Mahmoud's user avatar
1 vote
1 answer
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Why Sintered Tantalum Powder Forms a Sponge-Like Structure?

I read that to make a dipped tantalum capacitor, they make tantalum powdered stick together with a binder and then sinter, which makes it porous. But why do the pores form? It seems that if they are ...
MeltedStatementRecognizing's user avatar
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Gear minimum amount of teeth

So I know from college (and a bit of googling, not gonna lie) that the minimum amount of teeth on a gear is 17 due to undercut forming in traditional cutting manufacturing. Does this rule still hold ...
php_nub_qq's user avatar
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Is it possible to seal a perfectly smooth surface?

I've heard that a surface roughness needs to be within a defined range, but in theory, is it possible to seal a perfectly smooth surface? E.g. with an o-ring, static or dynamic? Intuition tells me ...
spencer wilson's user avatar
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1 answer
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Why Sodium Sulphate is used in Sponge making

I read that sodium sulphate crystals are used to make sponges. The crystals are mixed in with some other stuff, then put into a mold. The mold is heated, causing the sodium sulphate crystals to melt ...
MeltedStatementRecognizing's user avatar
1 vote
1 answer
68 views

How are high accuracy grinding stones and disks made?

Generally speaking cutters such as end-mills and often lead screws are ground vs shaped using a sharp cutter. I am curious how are high accuracy grinding wheels made? Their very nature seems to be ...
FourierFlux's user avatar
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What methods can be used to stabilize a vibratory bowl used for orientation

I have a project where we are using a vibratory bowl to feed in parts to an assembler. The issue I am having is that the calibration sticker on the side is very out and a single line is very difficult ...
Teyash Arjun's user avatar
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1 answer
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PCB Manufacturer defects, what process/protocol to used?

During the manufacturing of 10,000 units of circuits, there are 10% defects in total. As an electronics test engineer, what can I do to improve this situation? Edit: Referring to "PCB ...
Alan's user avatar
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1 answer
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Why would the thread diameter be smaller than the drill diameter (countersink bit)

I'm having a hard time understanding the following data for the correct sizing of countersink holes I need to make a countersink for a screw with a thread size M6 which means that, according to the ...
CapBul's user avatar
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2 votes
1 answer
113 views

What is the force required to puncture through a sheet of foil against an anvil?

A hardened steel contour with a sharp edge presses against plastic foil which lies on top of a hardened steel anvil plate. What would be the force required to punch through the foil? I am familiar ...
jessegerritsen's user avatar
-1 votes
1 answer
35 views

Why regulations on refrigerant and not on efforts in preparing standard for leak proof refrigeration system?

Refrigerants from CFC series are banned due to environmental concerns,but why not focus on preparing a standard for registration system which minimize or eliminate leakage? It must be difficult to ...
Crazy_Court651's user avatar
3 votes
2 answers
159 views

Is the Stop-Start technology detrimental or good for the car?

I found a lot of articles on internet about how bad the stop-start technology is for your car and how it contributes to the faster wear of multiple parts, or how superb the feature is for the Sacred ...
Honza Zidek's user avatar
2 votes
1 answer
98 views

Why 95% Water is used Instead of 100%

So in this video(https://www.youtube.com/watch?v=v1z829NF9PA) at around 2:35 it says that the alluminium ingots for alluminium foil, after being heated, are cooled down with a mixture of 95% water, 5% ...
MeltedStatementRecognizing's user avatar
0 votes
2 answers
138 views

What are the practical solutions to manufacturing this mechanical piece?

My Custom Piece (Measures are in mm) I'm designing a custom mechanism that needs this piece to be able to function, but when i started thinking about how to manufacture it, I started getting confused ...
ZOus7's user avatar
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1 vote
2 answers
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Why Green Porcelain was Used for Chalkboards

This site: https://www.businessinsider.com/why-most-blackboards-are-actually-green-and-not-black-2017-11#:~:text=The%20color%20change%20came%20in,likely%20to%20survive%20the%20journey states that ...
MeltedStatementRecognizing's user avatar
1 vote
1 answer
43 views

Injection molding: What is best for a dual cavity single mold?

I would like to understand what's the best optimization in terms of design for a single mold, dual cavity of a two-part box (top and bottom parts) which should be hold together with 4 screws without ...
gregoiregentil's user avatar
1 vote
1 answer
281 views

Are some pasta shapes more/less costly to manufacture?

This weekend, I was shopping at the grocery store and found that the Lasagna was priced at about double per pound compared to other pasta shapes. That got me wondering if different pasta shapes are ...
stats_model's user avatar
3 votes
0 answers
67 views

Plastic hardness after machining vs molding

Should there be any difference in the hardness of a plastic material that is machined vs one that is pressed from a mold? This question is in specific reference to vinyl record production where ...
Lukas L's user avatar
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Material selection for plunger to be compatible with pressure seal

I am designing a jig to insert a pressure seal into a cap. The jig has a cavity which the cap fits into and then is loaded with the pressure seal which needs to be inserted further using a plunger. I'...
Teyash Arjun's user avatar
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0 answers
53 views

Which method is suitable for manufacturing this small scale geometry?

I want to have a channel manufactured in the dimensions shown in the picture. Which method is suitable for it. I think CNC can not achieve to work in such small scale. That rectangular prisms with 1....
CaptainCombo's user avatar
0 votes
1 answer
123 views

Why does Poisson's ratio always have the axial strain as the denominator?

Why can't we divide the lateral by the axial strain? Why does the axial strain always have to be the denominator? Would it matter if I was careless and accidently switched them around?
Anna Fakira's user avatar
0 votes
1 answer
56 views

How to integrate a heater in polyeurethane foam?

We are trying to integrate a heater in polyeurethane mattresses. However, the heating units we found are in fabric shape and hence the moment we pressurize the PE foam in the mold they deform and do ...
MHH's user avatar
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0 votes
1 answer
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Assembly process for common devices

As part of a course I am taking I am required to draw assembly process diagrams for common devices, such as electric motors, lamps, and mechanical presses, and I am trying to get the intuition for ...
user402525's user avatar

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