Questions tagged [manufacturing-engineering]

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What materials can be used to make press and blow moulds for glass manufacturing?

Would any types of 3D printed plastic be strong enough?
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why the fluidity test for casting is made in spiral shape?

Why fluidity test uses a spiral shape of casting? Is it to reduce the heat transfer? make it compact? Or any other reason?
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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 ...
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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 ...
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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'...
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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....
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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?
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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 ...
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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 ...
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1 answer
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Planned cycle time for manual manufacturing processes with high variability

I am in a factory with many manual (non-machine) operations. Process time variability for most operations is high, leading to highly variable cycle times at the part level. There are efforts to ...
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Creating a drawing in Creo

How would I make a drawing similar to this ? Would I have to use Creo parametric draw a sketch and then convert this into a drawing ? Or would I need to use a different Creo software ?
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6 answers
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How to work on big CAD project in team?

I'm always confused on what is the effective way to work on CAD with multiple team members to make it efficient. So far, as I'm freshly graduated I only work on a project where I'm the only one using ...
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Ideal Surface finish in turning

Why not depth of cut is equal to peak to valley height in ideal turning? I know the expression for peak to valley height in terms of feed. Though it seems correct, independance of peak to valley ...
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Which material, which geometry, which manufacturer? [closed]

I've experience as a development engineer but in software development, electrical engineering, and science experiments. So, even with a significant amount of experience, I've never been in the stage ...
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1 answer
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Where to acquire / create LED optics

I'm working on a few projects that require lenses to focus LED light flashes, similar to those lenses used by police lights (TIR lens) and other strobe traffic lighting utilizing Fresnel lenses. I've ...
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Pressure bag moulding Vs Vacuum bag moulding

What are there pro and cons of each method? In which industries were/are these molding techniques used? Why has vacuum bag molding supplanted pressure bag molding?
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1 vote
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What are some obstacles/issues you face while working in industry? [closed]

As part of a project incubator program at my university, I am trying to understand current specific issues, cumbersome processes, and obstacles facing engineering projects in industry. By pinpointing ...
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Determing best cost effective manufacturing process would be

I have designed a space frame and a case for said space frame. The case is a shell with one end up that is 18.50"x14.00"x10.50". I've looked a different places for the quoting for the ...
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4 votes
1 answer
220 views

Why do monocrystalline solar cells have rounded/cropped edges?

What is the meaning of this croped part? Why do they crop it, rather than let it be full square?
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2 votes
2 answers
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Transfer of low density solids

Which sort of equipment is specifically designed for flowing/pumping low density solids (powders) e.g. for loading from a drum to a receiver?
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Narrowing down injection moulding material selection

How do I narrow down specific values when selecting a plastic for injection moulding? My part is uniform in wall thickness and thins out where a hinge a present. Properties: Will not go under many ...
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2 votes
0 answers
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Is it possible to have a reference pulse interpolator for a CNC machine with dc drive?

Is it possible to have a reference pulse interpolator for a CNC machine with a dc drive? it should work with alternating current drive but I am not sure about the direct current drive. please help me ...
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2 answers
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Selecting material for plastic hinge

I have designed a plastic part shown in blue that will be injection moulded. The part is a lever that takes 1 mm of movement downward and outputs 6 mm of movement upward. Circled in green is a hinge ...
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4 votes
1 answer
41 views

Cleaning tape for automatic part cleaning during manufacturing

Is there something like a consumable cleaning tape for automatically cleaning parts during manufacturing? Some parts need to be cleaned before automatic assembly, e.g. magnets before adhesive being ...
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3 answers
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How to test the mechanical properties for casting parts?

We have conducted tensile testing after casting HPDC (using test specimen from casted parts), to check the elongation. Results are not same for most of the location, due to the different thickness and ...
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2 votes
0 answers
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Manufacturing with glass panels [closed]

I would like to design a 3.2-inch LCD display onto a product. The best aesthetic I have seen is using a flush glass screen front face. My product does not use touch screen. How would I go about ...
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1 vote
4 answers
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Is it somehow possible to "lock" moving boxes without damaging them? [closed]

I have a standard moving box like this: Of course, since I'm asking about it, they don't have a top-down photo. These are other photos, if they help you understand how it's constructed better: ...
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1 vote
1 answer
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How would I use a laser to cut a moving solid object?

Using a laser to cut sections out of a small moving solid has been suggested for a manufacturing problem. However, usually lasers come as a point, which means that we'd have to make the laser head ...
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1 vote
1 answer
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What does time temperature specifically give us? [closed]

What is a Time Temperature curve basically? I have come across this a couple of times while dealing with heat treatment in my industry. A detailed reply to this is most welcome.
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1 vote
1 answer
104 views

Why does decrease in dislocation density result in higher ductility?

Why does a decrease in dislocation density result in decrease in yield strength and increase in ductility?A slightly detailed explanation is what I am looking forward to.
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2 votes
1 answer
632 views

What is the characterising difference between a riser and a runner?

The image given below shows a bolster with a series of riser and runner. What I really do not understand is which is the riser and which is the runner. Also a detailed explanation to why multiple ...
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2 votes
1 answer
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Why laser cutting speed suddenly decrease when cutting sheets from 1 to 3mm thickness then stabilize?

Please to understand what I mean, see the picture below : I don't understand why it is not a linear curve (or almost), because at first sight it should be no ? If you need 10 sec to cut a length of ...
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1 vote
0 answers
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Evaluating a developed system by application of a case study

I am looking to the evaluation of a developed system to provide validity to my research. The system consists of manufacturing processes, procedures etc. and the plan is to implement the system at an ...
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1 vote
0 answers
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why did my ceramic matrix composite turn out brittle as snow?

I have attempted making a ceramic matrix composite (cmc) by wetting glass fiber cloth with waterglass and baking it at 200°C. The resulting material disintegrated on touch. Unwetted fibers did not ...
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2 votes
2 answers
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Is there a name for a process of constructing gradient/smoothly distributed material density?

Are there conventional processes by which one can construct a material that gradually transitions from one alloy or molecular density to another? For instance if I wanted a material that gradually ...
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1 vote
1 answer
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Why isn't there yet such a thing as a "Minimum Life Module" standard and concept deployed? [closed]

Why are large companies not producing, selling and maintaining the concept of "Minimum Life Modules"? What I mean is a standardized "module" hosting exactly one human being, with ...
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1 vote
0 answers
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Is there an instrument that can measure thickness of an object through strain?

So basically, I am doing a project to design a measurement tool for measuring the different layers of the quartz crucible used in the semiconductor industry. Since the crucibles undergo some ...
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1 vote
1 answer
72 views

How to cut a thick glass block at home?

Due to pandemic, there are a lot of machine shops closed and delays in getting something custom made. I was wondering how to cut a triangular glass prism (~5cm hypotenuse) in the middle so I have two ...
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2 votes
1 answer
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Wireless communication modules transmitting through body

I wanted to be able to transmit data from a wireless module to an Arduino. It is possible that a human body could come between the wireless module and the Arduino or someone might cover up the module ...
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2 votes
0 answers
31 views

Constructing small Kretschmann Surface plasmon set up

I am trying to build a SPR setup at home which is based off this diagram: I wanted to try to miniaturize it and had some concerns about my strategy. So I was thinking I could buy a big prism and ...
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3 votes
3 answers
78 views

Shade tree engineer needs help calculating hoop stress

I have an extruded aluminum tube. I'm trying to come up with an Excel calculator that will help me find out how much force would be exerted on the internal walls if the tube was filled with rubber, ...
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1 vote
1 answer
948 views

How to mechanically attach a compression spring to a flat surface

I am working on a new project right now and I was wondering if anyone had any ideas on how to keep a spring fixed and connected to this flat plastic piece [image shown below]. Our goal is to keep the ...
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1 vote
0 answers
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How to get soft touch matte finish on my resin cast parts?

I'm working on a prototype electronic consumer product for which I intend to use silicone molds with polyurethane casting to get the plastic body. I have seen a few products with a smooth satin finish ...
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1 vote
2 answers
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Mirror without glass?

I just noticed "mirror" was actually created by applying thin layer of metal on top of glass. In fact, the polished metal is exactly how mirror gets its properties - while glass itself is ...
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4 votes
1 answer
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What is the name of optimizing space between laser cut parts?

When we send some drawings to laser cut operation, they use a proprietary software (usually specific to the laser machine) to duplicate the drawings per request, with the spaces between parts ...
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3 votes
1 answer
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What are some examples of laser-based additive manufacturing techniques?

I'm trying to research additive (or 'bottom-up') fabrication techniques that rely on lasers or other advanced photonic systems. So far, the most prevalent technique I've come across is two-photon ...
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2 votes
3 answers
83 views

Small scale manufacturing [closed]

Some background: I am working for an ed-tech startup and we are hoping to release our first product soon but have been hitting a lot of hurdles with our current manufacturing strategy. We want to ...
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2 votes
1 answer
47 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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3 votes
0 answers
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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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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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