Questions tagged [manufacturing-engineering]

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1answer
26 views

Can a threaded fastener stretch so much it can be miss-read as a different pitch?

Can a threaded stud of mild steel, size 5/8"-11 over a threaded portion of 1.25" stretch so much over time that it reads 5/8"-13? Unthreaded portion of the stud reads .625-630" in ...
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0answers
33 views

Aerospace bolts and washer combination

In my aerospace company we have repetitive discussions regarding the stacking of low tolerance fasteners with non-countersunk washers. For example a fastner NAS6703-X (size 10) has a max. base radius ...
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24 views

chamfering of die ends

I was reading about all types of tube drawing process and i wanted to look up some images for better understanding. When i looked at images in different sites most of them had the die ends chamfered ...
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1answer
91 views

How is linear motion achieved in this automatic blackboard eraser?

In the animation shown below what can be the mechanism used for this purpose? I know it can be achieved by using rack and pnion gear arrangement. But how are this set up arranged in classroom ...
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2answers
38 views

Is it possible/practical to mold a single hollow piece of carbon fiber with a sealed vacuum in the middle?

Let's say I design a simple piece of carbon fiber to be manufactured, in the shape of a simple cylinder with a diameter of 2cm and a height of 3cm (pretty small). Is it possible and/or practical to ...
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4answers
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Why are most jigsaw blades designed to cut on the up stroke and have teeth that point towards the shank?

Why are most jigsaw blades designed to cut on the up stroke with teeth that point towards the shank? Why are reverse teeth jigsaw blades less popular?
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2answers
22 views

Cylinder's surface condition of gas springs (gas struts)

I've discussed part of these question somewhere else, but realized I have to be more specific about it. I'm new to this site and hope I'm doing the right thing. I'm planning to manufacture gas struts ...
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1answer
21 views

How Gas Springs or Gas Struts are pressurized with nitrogen gas and then sealed?

Prior to testing and probably painting, the last stage of manufacturing a gas spring or gas strut is pressurizing with Nitrogen. I was wondering how this step is done. I think it is filled with gas ...
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2answers
32 views

Technology used to create chambers in metal laminates

A number of years ago, I remember hearing of a technique to manufacture the leading edge surface of a hypersonic jet (or something aerospace related) where multiple sheets of metal were welded ...
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2answers
37 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
36 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
42 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
27 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
25 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
48 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
24 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
29 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
42 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
218 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
53 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
47 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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0answers
16 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
67 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
29 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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2answers
81 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
114 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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28 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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0answers
43 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
57 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
142 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
304 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
76 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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0answers
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
38 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
31 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
43 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
328 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
182 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
93 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
46 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?