Geometric Dimensioning and Tolerances

That is not a standard drafting abbreviation. It may be an industry specific one. Can you explain what the drawing is and the industry/area where it is used?

This too obvious to be true but does PI stand for π

3.14?

Hmm, that is unusual. Could "P.I." refer to a certain hole diameter/type such as may be further described on a boring chart? I have used similar call-outs such as "A", "B", "C" when a large part contained many holes of different sizes and types, but I always appended a boring chart to the drawing. If I am correct in my assumption, then you will need to obtain the boring chart to determine what must be done at these locations.

I do not think in your case that it stands for "pi", "punch in", "programme input" etc., and I think that you are missing some information.

Good luck - and let all of know what you find!

Ing. Robert Forbus

What feature on the drawing does the dimension relate to?

For gear-cogs etc. this would be "Per Inch" - but the limited context suggests not.

Could be a reference to additional documents as suggested ("Plant Information", or "Parameter Identifier")

This list of possible expansions (combined with knowledge of context) might help.

We could probably continue to make guesses at what P.I. could be for several months. The initial question on any drawing should be: "What are the rules?" Meaning what standards apply? While you're in the United states the drawing wasn't necessarily created in the United states or to comply with ASME specifications.

It has already been pointed out that PI or P.I. is not an ASME abbreviation, nor is it standard U.S. DoD or ISO abbreviation. So the question becomes are thier other standards indicated on the drawing? Volvo, Nissan, and Mahindra all use some very unique dimensioning practices, which do not comply with any national or international standard.

If you can't find this "other" standard which might provide you with a direction to persue, the next step is either to your management or to contact one of the drawing approvers (that's why drawing require signatures). The reason you might go to your management is because you can keep the issue internal to your comapny and when your company quoted the job they should have reviewed the drawings to know what they were getting into. Its probably far to late to adjust your bit price now if PI indicates gold plating or some othe fantasticly expensive process.

I've seen it used to indicat "Point Of Intersection"

I hate to ask the obvious (not really) Is there a sheet, second or third in the set perhaps, with abbreviations and definitions? As previously asked; "I have a print of a(n) _______ that has...".

Point of Inflection. Abbreviation used in plot plans.

Point of Inflection

What would that mean in the context of an engineering dimension?

Hire a Private Investigator to solve this mystery.

4 x 1.48 x P.I.

4 x .90 P.I.

We use P.I. for point of intersection between an angle and a radius, or 2 radii. It is

used as an programming aid on conversational programed CNC machine tools.

In your second example it would mean there are 4 places that apply.

As for your first example, I have never seen P.I. used in a formula.

I've seen it, (again not to any standard-and caused confusinion then also) to state Point of Intersection or Projected Intersection.

pcermola !!!

Details about the drawing

Several people have suggested 'point of intersection' but I can't see how that fits with the OPs dimensions.

4 x 1.48 x P.I.

4 x .90 P.I.

We still need to know the context of the dimension to make sensible suggestions.

Maybe P.I. stands for one of these:

• Petulant Intrigue
• Pointless Information
• Persistent Irritant
• Paul Ignacio (He drew the drawing.)
• Peripheral Index

Just a pointless inquiry, if you ask me.

Hi pcermola,

Can you tell me what the print is an illustration of?

Is there a name for reference on the print, or a company?

With it being a Geometrical print it is almost certainly pi. (As in 3.1415 pi). The mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space.

It may well be Pi 'Π'. uppercase P and I. It is not usually written like that. But if the 'I' (i) is replaced with what looks the same but isn't,.......>>> Replace the (i) with a small 'l' (L), and the search comes back with a completely different set of sites.

With more detail of what the print is and any writing on it, things may be a little easier?

Good luck and happy holiday!