Questions tagged [manufacturing-engineering]

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2answers
33 views

Can wet welding be done in mineral oil?

I'm interested in knowing whether or not submerged welding can be done in fluids other than water, specifically mineral oil in this case. The reason I want to know is that I'm looking into designing ...
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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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1answer
40 views

How did OXO get text into this inside feature?

I am a student trying to learn about how OXO made this cup. Here are some constraints that I know: I figured out that the text on the outside can be made using screen printing, but then I don't think ...
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1answer
26 views

What are good color coatings for a steel surface?

I need to decide upon a color coating for a steel surface. This will be a grill top accessory and will be in contact with flames. I would prefer a black/brown coating color. I was considering teflon ...
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2answers
24 views

Meeting point of turning wheels with rear wheels

I was watching this video about how steering on a vehicle. It states: If you track the meeting point of the left and right wheels, you can see that the meeting point always lies on the rear wheel ...
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1answer
42 views

Airsoft BB Funnel Design - Electric funnel jam solution?

I'm working on a design to feed Airsoft BB's through a funnel. A simple gravity fed system (ie. I don't want to force them out at speed) but every now and again the BB's get jammed at the end of the ...
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2answers
23 views

Are these “parts pickers”? “JLF” and “Little Joey”

I'm reading company training materials and I don't understand a few terms. I'm hoping that some of you might be able to decode. The company receives product and delivers it to work sites. I believe ...
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1answer
28 views

What material can withstand continuous working temperature of 1000 degree Celsius?

I'm designing a block for creating turbulence inside a traditional furnace. I would like to know about a material which is economical and can be put into operation for more than 2 years.
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1answer
39 views

Building a cooling system for a kneading machine?

I wanted to modify my kneading machine. In fact it can work for at maximum 5 minutes, and then I have to let it cool for 20 minutes (it is a very cheap model), and it is a problem for me. So I was ...
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1answer
38 views

Public data re possible estimate of baghouse efficiency. Plus characteristics of chromium emissions. Thanks!

I'm doing an article on a company whose Title V Operating Permit is currently under review by state regulators. (See biographical note below.) See also my specific questions, numbered below. Most ...
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1answer
209 views

What does “bedding-in” mean in casting technology?

I've heard this term used a lot in literature but I don't understand what the technique is they are referring to. Please help me out here.
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2answers
38 views

grey cast iron from freezing point to room temperature (cooling process)

Do grey cast iron expand from freezing point to room temperature (cooling process)?
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3answers
46 views

Where to find springed pegs with screws for a CNC mill?

I need to hold small pieces of wood in place to be drilled by a mini computer-numerical control (CNC) mill. I have a book stand (no affiliation) that has two "springed pegs" fastened with screws: ...
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15 views

In a sheet polymer/metal extrudate, why does the thickness varies while exiting the die and how much is the variation of thickness?

When a metallic or polymer/rubber sheet is extruding and leaving the die, it is seen that the variation of thickness occurs at the location of the die opening and at a distance far from the die ...
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1answer
62 views

What is the manufacturing method used to make aluminium C channel

I don't know how this is made and I don't know the name of the method to search for it to learn more.
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1answer
28 views

Is it possible to spot weld three rather than two plates?

I have a situation where ideally, I would like to resistance spot weld three rather than the usual two plates together (individual plate thickness approximately 0.7mm). Is this at all possible? If not,...
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1answer
51 views

Is CNC milling on metals always followed by heat treatment?

CNC milling causes residual stresses in metals. So, after CNC milling of a metal part, say aluminium, do all manufacturers (I'm not referring to any specific manufacturer, just generally) heat treat ...
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54 views

Could 3D printing be done at a distance e.g. by pointing laser?

Could 3D objects be printed from a distance? Say, by pointing a laser at a stone wall? I'm not concerned with whether the requisite technology already exists or would be difficult to build, but ...
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2answers
112 views

Talking in terms of 6 sigma, why 4 ppm would be very costlier than 1 ppm (part per milion)?

In industrial manufacturing lines, there is a a limit on the number of discarded parts per million.I need to have a sense about this, e.g. How different is 4 ppm from 1 ppm and how much does it ...
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1answer
27 views

Feasibility of additively manufacturing large metal objects in microgravity/high vacuum (space)

This a somewhat speculative question; I would like to know whether it is feasible to additively manufacture large (>100m) metal objects - from for example aluminum alloys - in a space environment. ...
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0answers
26 views

What is the smallest size of pipe to which I can Weld a 1 inch pipe Perpendicular to the Axis?

I would to know what is (or how to calculate) the size (dia) if the smallest pipe to which I can weld a 1 inch pipe from the side of the bigger pipe perpendicular to its axis (like a tee).
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1answer
49 views

How exactly do noise canceling headphones work?

I purchased a pair of noise canceling headphones today and I was just wondering how exactly they are able to cancel out background noise?
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42 views

What kind of professional(s) build/design factories? [closed]

I have a small self-built food processing unit (500sqft) but it is very labor-intensive. I want to make a larger unit (45,000sqft) with 100x more output using factory machinery (automation, conveyor ...
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2answers
48 views

What does stress analysis of 3D printed parts reveal vs their normal counterparts?

I have seen videos or heard about 3D printed buildings, 3D printed space shuttle parts and more. There seems to be a lot of craze developing around 3D printed manufacturing. I have never heard anyone ...
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1answer
44 views

Is there a way to avoid reheating of steel billets in Reheat furnace and directly go from casting to roll milling?

Iron ore and few compounds added will result in steel which are casted to steel billers form. this billet is again reheated to melting point of 1200c and then sent to roughing mill for desired shape. ...
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1answer
28 views

Bolt circle indication on angled ellipse

Ok so I am a machinist, not an engineer, but figured someone here might be able to provide some insight into my situation. The part is 2.75" diameter and is on a 3.3* angle in the X axis on my mill. ...
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2answers
133 views

Should I use shaft or hole basis on a constant diameter shaft with both clearance and interference fits?

I'm looking to manufacture some steel pins and plates, with a view to large scale production in the future. One of the pins of the design has a constant diameter. This pin passes through holes in two ...
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2answers
47 views

Best way to dent a pipe from the inside?

I am currently trying to redesign a pipe with 2 dents from the inside. What is the best way to manufacture something like this, also how would i go about describing this process in a drawing? In the ...
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1answer
43 views

What's the best material to use for my project

I need to get a piece of stiff material cut and drilled for a project I'm working on. It has the following requirements: 1.6mm thick should be stiff (similar to PCB material, aluminum, fiberglass) ...
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2answers
193 views

What are the design principles for risers in sand casting?

Risers are added reservoirs used to feed liquid metal to solidifying casting. In the case of alloys that shrink during solidification (this is not the case of all alloys), one uses such reservoirs to ...
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3answers
71 views

Is there a cheap way to get gears

Is there generally any cheaper way to get a bunch of gear wheels. I've been to some local companies who specialize in gear production and the price is always somewhere in the range 100-150 USD for a ...
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25 views

Phase prediction by cct diagram

Can someone please help in finding out the phase proportion of each phase w.r.t time , cooling rate and temperature by using (mathematical model to predict phases from given cct diagram) Leblond ...
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2answers
37 views

Would some manufacturing processes be more efficient if driven differentially by a single motor, up to ~150 kW, than multiple lower-rated motors?

I'm writing a discussion paper on the potential energy efficiency benefits of integrating different manufacturing processes by co-location on the same site. One possible field for integration is in ...
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1answer
29 views

How is the drilling done along the axis for a typical synchronous motor shaft?

I was looking in google, but I did not find any information on how the drilling was done, I would appreciate it if someone who knew how it was answered. As typical it could be an axis of 200 [mm] in ...
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2answers
41 views

What is the engineering way to describe a factory / manufacturing plant system in a formel and mathematical way

I am interested in mathematically describing as well as formalising a manufacturing plant so that other people in the engineering field understand how the system works. I am not from the engineering ...
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2answers
19 views

Over torquing two different materials

What happens when you over torque a joint comprising of two different materials ? Will the corresponding material wear make the joint leak proof ?
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1answer
276 views

what actually cause quench cracking ? non-uniform cooling or rapid cooling?

It’s well known that quenching most alloyed steels starting from AISI 4140 to high speed steels in water, brine , or sometimes oil will cause cracking and distortions. in industry oil quenching ...
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2answers
142 views

which type of casting will give higher cooling rate, casting in thin water-cooled copper mold or casting in thick copper die?

It is will known that increasing cooling of a metal casting will lead to finer micro-structure which mean higher mechanical properties. If I have 2 molds one is thick copper die ,& second is just ...
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1answer
91 views

Validation protocols [closed]

Question from a validation beginner in the pharmaceutical industry. What are the common approaches to start writing validation protocols (esp. IQ, OQ, PQ)? What are the common approaches to start ...
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1answer
159 views

What is the name for a removable sewn bag stitch?

This stitch is composed of a single string/thread and is common on dogfood and grain sacks. It can be removed by just pulling on the end. Here is an example I found on youtube. Thanks!
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2answers
45 views

MANUFACTURING PROCESS: ROLLING PROCESS

In the rolling process, Why should the velocity of the strip at the entry before coming in contact with roller be lesser than the velocity of the roller?
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1answer
326 views

How are non-continuous internal threads plastic injection molded?

I'm trying to figure out how the heck some of these plastic bottle caps are injection molded. By having the thread on the inside of a cap, this obviously creates an undercut. Now I've watched some ...
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2answers
107 views

What is the percentage of direct workers in an automotive production plant compared to all the employees?

I am not asking for specific numbers of any production plant. I want to know the general direct worker/employee ratio of a plant. Example: if there are 1000 employees working usually 700 of them are ...
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2answers
91 views

Coating brass components cheaply

I have seen a number of products made of brass with a silver-looking coating covering the brass on the outside. These products are all quite cheap (for example a small watering can or clothes hooks). ...
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1answer
38 views

Is there a reason why both plasticizer and vulcanizing agent are needed during processing of rubber?

According to this Wikipedia page, vulcanization is an important process to make rubber harder and more durable. However, another Wikipedia page says that plasticizers play a significant role in rubber ...
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1answer
66 views

Manufacturing screw thread onto lid

I am wondering how the screw top of a container made of either aluminium or brass is manufactured at scale. A picture of the sort of thing I am talking about is below. Currently the only method I can ...
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1answer
850 views

What are functional and manufacturing datums

Can somebody please explain what is ment by functional datum and manufacturing datum, with respect to dimentioning and tolerancing.
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0answers
149 views

What are the raw materials for water filter housing production? [closed]

I want produce water filter housing (like below images) who can tell me what are need raw material for these? Best Regards
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1answer
65 views

Cheapest way to produce 200-1000 pieces of 0.2 mm copper plates

I want to build a strong electro magnet. I came to the conclusion that the smartest arrangement would be something like hundreds of thin sheets of 0.2 mm copper with PTFE isolation. This reduces ...
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5answers
274 views

What is the most efficient way to remove the cardboard center piece from a roll of paper?

For a temporary job I'm working, one of the tasks we are sometimes required to do is to unroll these giant spindells of paper (think rolls of toilet paper the size of a trash bin except the paper is ...