Questions tagged [manufacturing-engineering]

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4
votes
1answer
775 views

How do I cut a crack into a polymer/plastic?

We need to cut a very thin crack into a polymer plate for a research project. The closest thing to what we are looking for is Wire EDM but since the polymer we are using is not conductive we cant use ...
4
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1answer
117 views

Why can't red flint glass be produced?

I recently went on a tour of a glass manufacturing facility who produce bottles for the prestige alcohol market. I was informed on the tour that red glass cannot be directly produced - any bottles ...
5
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2answers
1k views

What are 'inside' and 'outside' dimensions in reference to castings?

I am looking at a company-written standard for cast parts. The castings are blanks for driveshaft yokes, similar to what is pictured below. The standard defines general tolerances for the dimensions ...
9
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2answers
154 views

Material selection for weight scale

I am looking to test the FlexiForce sensor in measure force, however for accurate readings the load needs to be disturbed evenly over the sensing area. As such I am having "discs" made to cover the ...
4
votes
1answer
419 views

What is the accuracy of direct metal laser sintering (DMLS)?

They've printed jet engines with it that work after polishing. So how is the accuracy measured and how accurate is the DMLS process? I can't find the required info anywhere.
4
votes
1answer
609 views

Bend allowances when making a C-shape plate

I am trying to find the formulas for making bends in sheet metal. I understand there are formulas for bend allowances. My issue is how do I determine where to bend if I want the inside dimension to be ...
4
votes
1answer
177 views

Is it feasible to forge multiple, smaller parts in the same forging operation?

Let us assume you have a large forging press or drophammer, and drawings for a set of smaller parts that all need to be forged from the same material. Would it be feasible to construct a forging die ...
0
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1answer
69 views

Identification of Foundry equipment

Good day! We (undergraduates w/o prior foundry experience) inspected a foundry for its health hazards, our problem is we are not permitted to be accompanied by a laboratory assistant, so we don't have ...
7
votes
1answer
62 views

What is a method to detect thermal oxide layer after steel is painted?

Is there a method to test for thermal oxide on a painted steel part after the paint has cured? I'd rather the method be nondestructive but it only being destructive in the presence of thermal oxide ...
5
votes
1answer
150 views

Limits of Injection Molding Regarding Overhung Edges

I'm looking to redesign a seal my company currently uses. The original task was to re-source it from a lower cost supplier with the same design as is in current production. However, the supplier doesn'...
7
votes
1answer
528 views

How do the dimensions of a ductile iron casting change as it cools?

I am designing a pattern for a sand casting. It has only one critical dimension which is a 4" inner diameter cylinder. If I use a 4" core, will the casting shrink away from the core? In other words ...
3
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3answers
5k views

How were gears manufactured before power tools, CNC, etc

Current gear manufacturing methods for gears usually depend on power tools, or computerised machines, or something like that. However, watchmakers and clockmakers at one point in history needed to ...
4
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0answers
29 views

Pretreatment for galvanizing primer

I currently need to paint a steel structure with galvanizing primer. The primer is an epoxy with >90% Zinc content. The TDS for the primer states that intimate contact with the substrate is needed ...
11
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3answers
426 views

Why are mass-produced metal parts machined by rotating the part against a stationary tool?

There's a TV programme called "How It's Made" which often shows automation of mass-produced machined parts. Very often, it seems that metal parts are machined (especially drilled) by rotating the part ...
1
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4answers
2k views

Designing electronic enclosures for manufacturing

I am trying to design a simple plastic electronic enclosure for a PCB and I wanted to learn how to get the enclosure as ready as possible for manufacturing. I basically wanted to understand the ...
4
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2answers
193 views

Understanding redundant pharmaceutical packaging

I ran across an interesting combination of packaging for some medicine the other day. The medicine in question was a prescription migraine medication. The exterior, cardboard package that it came in ...
3
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1answer
2k views

How to design electronics to mitigate tin whiskers?

Tin Whiskers are a major problem in the design of electronic circuits and the manufacturing of electronic hardware. What are Tin Whiskers? How can electronic products be design to mitigate the issue ...
13
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3answers
5k views

Measuring longer distances with high accuracy

I am involved right now in the fabrication of steel structures on the order of 5-50 feet long. Presently, we measure these structures with garden variety commercial tape measures. Most of the time, we ...
3
votes
2answers
13k views

How do I manufacture a fillet?

What are the most popular and the most efficient ways to machine a fillet on an external edge of an object? If I were to use a CNC mill, what tools can I use for it, and how would the method change ...
6
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3answers
264 views

How can the vendor be approved/disapproved based on validation test data?

The power requirement for a sub system is 5V +/- 10% @ 1A of current. A RFQ was issued and a prospect vendor was selected. A first article of inspection (FAIR) has been submitted which includes 15 ...

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