Questions tagged [manufacturing-engineering]

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61 views

How did scientists develop the stencils that made even more precise processors than they had previously?

The history of computers seems somewhat pervasive since there are so many steps in modern manufacturing and so many changes in trends with transistors over many years. Grasping how we got to our ...
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1answer
116 views

Operator's Efficiency

Good day, I have assigned a task where I have to calculate efficiency per operator as shown in image below. But I have no idea how to get the correct formula. Any help would be greatly appreciated. ...
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1answer
60 views

Best way to manufacture stainless steel apparatus?

Shown in the images below I have designed a small stainless steel apparatus with accompanying hollow metal cylinders ontop. I'm looking into larger quantity production and simply CNC'ing these would ...
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2answers
39 views

How to estimate the time cost of interrupting a task and picking it up again later

In terms of personal productivity (single machine scheduling) when a task is interrupted before being done in order to switch to a different task, it incurres a 'tear down' time cost - putting tools, ...
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1answer
49 views

Document Feathering Tolerance on Drawing

I am recreating an engineering drawing package from old quotes for a large assembly. In the quote they say "All length edges not to exceed 1/32" deep feathering". For some context this is for a bunch ...
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2answers
34 views

How to retrofit seed starting trays to prevent root circling

I grow plum trees from pits using seed starting trays: Unfortunately, I have a problem where the roots of the seedlings grow in circles around the bottom of the cavities of the trays. The circling ...
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2answers
86 views

Does every engineering design needs to have a complete theoretical backing or may experimental data suffice?

This may sound rather vague on its own so I will explain with examples. The solid booster rockets used by NASA space shuttle used a central bore design because it had a certain characteristic on ...
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2answers
147 views

How to design a casting machine?

I was wondering, what are the factors to consider or how to find the required technical specifications for the new machine? For example, if we consider a design of horizontal centrifugal casting ...
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2answers
61 views

Surgical steel and part production

Steels 316L, 420, 17-4PH and 316LVM are often chosen for medical products and labelled as "surgical grade". I am curious as to how these types of steel are used for the production of common medical ...
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2answers
201 views

Pneumatic Can Crusher (Number of holes allowed for crushing plate)

Hi I'm designing a pneumatic can crusher for my course, and came across a problem. How many allowable holes would be ideal to relieve pressure on the crushing plate of the device? Are there ways to ...
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1answer
2k views

How to make an annular metal to metal snapfit?

I am designing a watch case and would like to know how to make an annular snap fit for the backplate. The material used is stainless steel. I could find references for Metal-plastic snap fit but I ...
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1answer
92 views

Tolerance of pin in Scissors

I'm currently designing scissors, and I have to describe the tolerance and fits of the parts. What kind of tolerance must be used for the pin holding the two blades together, though allowing for ...
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1answer
104 views

Real world applications where one would use a force function in PLC programming?

I'm curious about which scenarios one would use a force function when using a PLC programming interface. Examples pertaining to process engineering, manufacturing, or industrial settings would be ...
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2answers
89 views

How can i obtain heat from conductive paint using dc current

I have been searching for a material that can heat up when we supply dc current. Many give me a suggestion for use nichrome wires. Or carbon rich paste paint(conductive paint). I want a sheet of such ...
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42 views

Industrial machinery and equipment [closed]

I am a mechanical engineer who is interested in learning different processes and equipment mainly used in process industry namely, textile, chemical, sugar mill, and other food process industry. Is ...
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3answers
458 views

How to find out what a material is made of specifically?

Let's say I buy a barbecue grill, is there a material testing kit that I can buy that'll allow me to find out what metal the grill is made from and if it were galvanized or cured in a particular ...
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2answers
53 views

Is there any method to recycle air-pollution into fertilizer?

Vehicles and Factories produce air-pollution like Nitrogen Dioxide(NO2) and Sulfur Dioxide(SO2). Plants use Fertilizer with those same compounds (NO2 & SO2) So, by what method can air-pollution ...
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1answer
147 views

Purpose and name of fine pitch marks on a cast metal part

I have seen this kind of mark on various cast metal parts. This is an image of the base casting of a hard disk drive made by HGST. What are these marks for? What are they called?
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1answer
35 views

How to avoid oxidation of Si using a sub nanometer layer

Which material can be used to protect a Si layer from Oxidation by a sub nanometer layer?
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1answer
65 views

How to obtain an homogeneous mixture of 10 000 tons of minerals, each one in a different pile? [closed]

I have several (at least six) piles of mineral adding up to 10 000 tons. I want to mix them in one homogeneous big pile. How can I do it? Thank you very much!
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1answer
3k views

Sheet Metal Bending: stuck on calculating the minimum radius required

I'm used to calculate the minimum radius required for bending operations on both aluminum and steel sheets, given the following parameters: https://imgur.com/a/7akHC Problem statement: For a sheet ...
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2answers
167 views

Operation of Fruit Blender-Mixer

I was wondering how blenders used in the kitchen for the purpose of creating smoothies, soups, etc. operate, particularly, how the rotation of their blade is achieved, i.e. what sort of motor is used ...
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1answer
51 views

What considerations should I take when flame-hardening a wheel?

I'm currently trying to figure out whether or not we can flame-harden a steel wheel which was supplied with a lower hardness than expected. I'm worried, however, that flame-hardening can either deform ...
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2answers
254 views

What's this mystery symbol on a manufactured machine?

I hope this is the right place to ask this question; if not I'd really appreciate some tips as to where else I can go for answers. The symbol above (apologies for the blurry quality) is on a Chinese/...
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2answers
44 views

Resistance spot welding multiple metal thinknesses

I have a question for all experienced in manufacturing of steel products; Is it possible, and or workable to resistance spot weld dissimilar metal thicknesses together? for example, 1.5-2mm thick ...
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1answer
1k views

Circular keyways - advantages / disadvantages?

What are the advantages and disadvantages of using circular section ("Scotch") keys, keyseats and keyways? I am not referring to Woodruff style, I am only interested in the type where the key itself ...
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2answers
159 views

Designing bulk material handling system for injection molding

does anyone have any resources for designing a bulk material handling system for an injection molding outfit? Currently we get material in gaylords and vacuum it to the hopper on each molding machine ...
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0answers
58 views

Measuring Helix Angle

What is the best way to measure the helix angle of a helical cut gear? I have a sun gear from a planetary set that I would like to have custom made but I'm not sure the best way to get the helix angle,...
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2answers
1k views

Shaft Spline Information

I have a shaft with splines on it that I want to create a drawing for in Solidworks because I may need to have this specific spline replicated on a part in the future. Does anyone have any ...
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1answer
230 views

Why aren't modern pistons circular?

I'm trying to make most of an engine from scratch (cylinder, crank case, piston). I've been reading about pistons and I've learned that many modern pistons are cam ground--slightly elliptical in shape ...
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68 views

Spinning a balanced load with DC motor

Enclosed within a consumer electronic, I would like to spin a small balanced load. The device will be rotated relative to gravity, but no other direct forces will be applied to the load. A coreless ...
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2answers
1k views

Part to “increase” the diameter of a small shaft, what is is called?

In my lab we have dressing tools for sharpening grinding wheels. The tools are diamonds mounted on a steel shank and the shank fits into a custom holder with a set screw in our machine (pictured). ...
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3answers
70 views

How to manufacture parts with complex air channels inside?

I am designing a part that requires multiple air channels with an intricate structure inside. I would like to know if there is any state of the art injection molding technique or other technology that ...
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3answers
2k views

Work hardening?

Can some please explain why is the elastic modulus of aluminium and work hardened aluminium the same? Is it only the same for pure metals?
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1answer
46 views

General purpose automated assembly?

I've been using 3d printers for prototyping for a long time, and I'll admit it's incredibly convenient to be able to throw together a CAD model, send it to the printer, and have it ready to assemble ...
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1answer
826 views

Definition of the “specific material removal rate”?

I've run across a term in some grinding manufacturing research papers called the specific material removal rate. The units given for this term are [mm$^3$/mm$\cdot$s] (I don't really like this style ...
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1answer
56 views

Can graphene really be made in a modest lab at home?

I have seen some resources on the Internet that claim to be able to make sheets of graphene (single atom thick lattice of hex-bonding carbon) from commercial off the shelf materials and a modest lab ...
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1answer
50 views

What manufacturing process is suited for production of the elastomer strip?

What manufacturing process should be adopted to manufacture a LEGO® compatible strip made by material which is rubber like?
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1answer
71 views

What is the real CO2 emission for cars? 1g/km or >100g/km?

If one searches for the different levels of CO2 emissions in cars, one can find two very different levels. For instance: 1: Here it is written that: The law requires that the new cars registered ...
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31 views

Tool fixture and holding

How do I hold a end milling tool in a rod which is smaller than the tool(smaller efers to the diameter of the rod).
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3answers
567 views

How to select the correct grinding wheel type for precision grinding of tool steels?

I am planning to move from conventional grinding wheels to super-abrasive grinding wheels. I am unable to decide the right type of super-abrasive wheel for my manufacturing operations (I am into knife ...
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1answer
327 views

Artificial Intelligence in manufacturing machines

I am a researcher on robotics and AI, and wonder if traditional manufacturing machines, such as lathe, CNC, or grind use any kind of machine learning technique or algorithm. This algos are widely used ...
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2answers
164 views

Plastic Injection Moulding a Piece with Undercuts

I am a newcomer to Plastic Injection Molding and would really appreciate some advice. I have a prototype object that will be made from a type of polypropylene. I only need a maximum of 10 units ...
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1answer
95 views

Torque limiting application

I have an application in which speed of the shaft is 0.54 rpm. The input speed of the motor (induction 4 pole AC motor) is 1400 rpm. So the gear reduction is enormous. I had two helical ...
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2answers
57 views

What type of shop could make an isetta body?

I am curious how car bodies were made back in the 1950s. Specifically the micro-car bodies like the Isetta. What techniques and tools were used back then? They seem fairly simple. Could a body for an ...
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1answer
1k views

Hand-pressed metal stamping - fishing spinner blades [closed]

I want to stamp my own fishing spinner blades. They look like this: http://lurepartsonline.com/Online-Store/Colorado-Blades/Premium-Finish-Colorado-Blades.html Specs are usually 1mm thick, 3x2" ...
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2answers
1k views

How to attach lycra / leather to Polyurethane foam?

What would be the best solution for attaching polyurethane foam to a lycra sheet of material. I was thinking a chain or pad stitch or possibly glue, but not sure if sewing would be the best ...
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1answer
35 views

Multicolor dip-painting techniques

I once saw on TV a factory dipping a product into a tank of paint and it magically emerged with a crisp pattern. (It was an Archery bow, and the pattern was army-style camouflage). Was I deceived or ...
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2answers
711 views

Line balancing - How far do companies go? [closed]

I understand that the concept of line balancing is such that each station takes exactly the same amount of time to process one unit. Clearly, this is an idealization and real manufacturing plants will ...
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3answers
1k views

How to manufacture cutting dies for metal foil?

I am making a die for cutting arbitrary shapes from thin (0.1–0.5 mm) copper foil/sheet using a manual arbour press. The product will be an oak leaf shape, approximately life-size, for use as part of ...