Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [manufacturing-engineering]

207 questions
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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 work to a tolerance of about +/-1/16" and don't…
Ethan48
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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?
Adam
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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 against a stationary tool rather than holding…
Lefty
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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/Taiwanese-manufactured piece of testing…
FisherPeak
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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 sensing area. For my application the thinner the…
Anthony Phan
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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 the CAD software. At best there's only two of us,…
el-cheapo
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Line balancing - How far do companies go?

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 have bottleneck stations and underutilized…
user1936752
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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 is also acceptable. I am specifically looking for…
Acumen Simulator
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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 will the inner diameter of the cylinder end up…
Wallace Park
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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 a sculpture project. I am pretty experienced at…
Chris Johns
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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 power supply samples. The samples have been tested…
Mahendra Gunawardena
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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 videos on Youtube on the process, and I can see…
Davbog
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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 burn rate and thrust. If this data was to be…
Allahjane
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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 on the part, and it classifies them into two…
Trevor Archibald
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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't work with the type of material the seal is…
Trevor Archibald
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