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Ballooning a Print (Drawing) - A correct way to do a "bubble" print for a PPAP


jaf insp

Datums are not features of size. They are theoretically exact points, axes, and planes. They are used to orientate and align the part with "Datum Simulators".

How do you report a datum?



Don't forget to do the Notes First even if they do not apply. Right lower corner information in the block must be next. Then proceed.

Proud Liberal

Quite Involved in Discussions
I have never seen a "How to number a print for dummies" book (although it would not surprise me that some yahoo with too much time might have actually written one:rolleyes: ).

I guess I come close to being that yahoo. Although I didn't write a book, the attached procedure does do quite an anal-retentive stab at it. The basic approach I use is to make it easy for engineering to read an inspection report even if they don't have a copy of the ballooned prints in front of them.

1. Balloon numbers are based on part features (not dimensions). ie: a hole with a diameter, position, form tolerance gets a single balloon number which results in all dimensions related to the feature appear together on the report.

2. Views, sections, and details are numbered in order (numerical or alphabetical). Reports print out in a logical order.

3. Numbering in each view, section, or detail always starts at 6:00 o'clock making it possible to use an un-ballooned print if necessary.



another day closer
Tabor gave me a Dynamic stamp for PDF's some time back (the old cove) I still use it and it works very well, one for numbers up to 99 and one for 100 and over so it is just a PDF stamp to use. if anybody interested please let me know.
So I am interested in this and for a long time I would have agreed with 'start at top left and go clockwise method', but from some of our customers we are getting different expectations. One in particular (global OEM in the auto industry) is requesting that we balloon the drawing the way we measure the part.
i.e. start with Datum A, then measure all features linked with Datum A. then Datum B, and then measure all Datum B and AB related features, and so on and so forth. After all datum related feature are measured, then move to the normal features, and then the material and testing call outs.
Originally I have rebelled against this, but then reviewing my companies prints, I can understand this request. It seems more logical to me.

Has anyone ever encountered this method being requested?
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