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Manufacturing process engineering · Lesson 3 of 4

Manufacturing process engineering: methods and worked application

A repeatable method template, then worked limits, sheet-yield, run-length, bottleneck and bend-development examples using AFS’s own limits, template geometry and register thicknesses, with textbook flow figures marked as such.

You will be able to: Apply four documented methods to a realistic job: a limits check, a sheet-yield calculation, a bottleneck and work-in-process calculation, and a bend-development uncertainty budget, recording assumptions, units and inspection points.

13 min · 12 slides · 9 questions

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Slide 1 of 12

The method template

Write every method the same way: the inputs with their source, the assumptions, the arithmetic with units, the result, and a check.

Every number in this lesson names whose it is: an AFS register, a template default, a published table or a textbook example. None is a measurement taken at the AFS shop.

Sources

Glossary

Strips per sheet
In AFS’s quoting method, how many strips of a given blank width come from one 48 in sheet width: 48 divided by the blank width, rounded down.
Yield
The share of a sheet’s width that ends up in strips, for example 50.3% for a 24.125 in blank on a 48 in sheet.
Critical work in process
In Prof. Gallego’s notes, the bottleneck rate times the raw processing time; below it parts do not wait, above it they do.
Little’s Law
Throughput equals work in process divided by flow time, which Gallego notes holds quite generally.
Coupon
A small test piece formed and measured to find a value, such as K, for a material, thickness and radius.