model job analysis and job sheets

In the book, Technical Drawing, by Frederick Giesecke, Alva Mitchell and Henry Spencer (1949), there is a section entitled "Analyzing the job" on pp.491-496. They write: "A simple method is suggested here which has been used both in industry and in the classroom to hasten the progress of inexperienced students in applying principles of good shop practice to their designs. No such method is a substitute for actual experience, but it may be said definitely that students who first master this simple technique will increase the speed with which they will learn to design for efficient manufacture when they do get practical experience."

They describe the method as follows: "The method is to fill out a `job analysis sheet' [...] for each detail drawing. List, one by one, each operation to be performed on a given part." They give an example of such a job analysis sheet in Fig.834 on p.495 as well as some examples to do for exercises on p.496. They work through a concrete example in some detail on pp.491-494, explaining how they finally arrived at Fig.834. They seem to do a good job (I'll know better after I've worked through it carefully) but it is only one example and only a few pages. The other drafting books I have don't seem to mention or use this concept.

What I would like to find are more examples worked out like this in all detail. I've seen some shop drawings, which include instructions such as they describe and which probably meet high standards, but they normally don't include the reasons for giving those particular instructions. I want to see the reasons too.

In a way, this notion of a job analysis and job analysis sheet is like a program to be executed by the person who will actually machine the part(s) in question. As such, it is a precursor to a program for a CNC device, and writing such programs is a skill I would like to acquire. I don't know what books I should read for that. I know that Machinery's Handbook, which I drool over occasionally at the bookstore, has some information on it for a particular programming language. I also know, in part from Joe Martin's book, Tabletop Machining, that one needs to know a lot about machining before one can actually expect to write a program that can be executed with the desired results, but it seems to me that what the authors of "Technical Drawing" wrote about the benefits of such "programming" must still be true in this context: although no substitute for actual experience, the effort will hasten the progress of inexperienced students.

So the other thing I would like to know is what books people on this newsgroup recommend for learning to program CNC devices, with particular emphasis on the "job analysis" thought processes instead of just on the programming language and its syntax.

Ignorantly, Allan Adler

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Allan Adler
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Allan Adler wrote in article ...



I'm not sure if this will help, but on my way to earning my vocational teaching certificate, I had to develop a trade analysis which included the ongoing addition of individual task analyses.

There are books available on "Occupational Analysis" at many teaching schools - especially those specializing in vocational teaching.

Bob Paulin - R.A.C.E. Chassis Analysis Services

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Bob Paulin

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