Download Dimensioning Guidelines for Producing Quality PDF Files with pdfMachine and more Study Guides, Projects, Research Engineering in PDF only on Docsity!
Principles of Dimensioning
Introduction
A detail drawing is expected to provide not only the complete shape description of the part, but also furnish size description. This is provided in the form of distance between the surfaces, location of holes etc., Apart from this, other details like kind of finish, type of material, etc are also need in the case of production drawings. These features are illustrated on a drawing by the use of lines, symbols, figures, and notes, called dimensioning. Proper dimensioning requires engineering judgment and thorough knowledge of the practices and requirement of the production department. Dimensions are classified into the following types:
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
- Functional dimension (F) ñ A dimension that is essential to the function of the part.
- Non functional dimension (NF) ñ A dimension that is not essential to the function of the part.
- Auxiliary dimension (AUX) ñ A dimension given for information purpose only. It does not govern the production or inspection operations and is derived from other values shown on the drawing. An auxiliary dimension is enclosed in parenthesis and no tolerance applies to it.
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Execution of Dimensions
The elements of dimensioning include the projection line, dimension line, leader line, dimension line origin indication, its termination, notes, the dimension, etc. The various elements of dimensioning are shown in Fig. 1.
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Fig. 1a Elements of dimensioning
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Fig. 2 Placement of dimensions where the shape is best shown A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
- As far as possible, on a drawing, dimensions should be expressed in one unit only, preferably in millimeters, without showing the unit symbol (mm). Unit on the drawing, however, may be shown in a note (Fig. 9).
- No more dimensions than are necessary to define a part shall be shown on the drawing. No feature of a part shall be defined by more than one dimension in any one direction (Fig. 3).
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
- As far as possible, dimensions should be placed outside the view (Fig. 4).
Fig. 4 Placement of dimensions outside the view A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
- Dimensions should be represented from the visible outlines, rather than from hidden lines (Fig. 5).
Fig. 5 Marking of dimensions from the visible outlines A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
- Interesting projection and dimension lines should be avoided. Were unavoidable, however, neither line should be shown with a break (Fig. 7a). Dimension line should not be used as an extension line (Fig. 7b).
A centre line or the outline of a part should not be used as a dimension line, but may be used in place of a projection line (Fig. 7c); where centre line is used as a projection line, it may be continued as a centre line.
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Fig 7 A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Projection and dimension lines should be drawn as thin continuous lines. Projection lines should extend slightly beyond the respective dimension line. It should be perpendicular to the feature being dimensioned. Where necessary, however, they may be drawn obliquely, but parallel to each other in special cases, such as on tapered features (Fig. 10).
Fig. 10 Dimensioning a tapered feature pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible across A pdf writer that produces quality PDF files with ease! nearly all Windows platforms, simply open the document you want to convert, click “print”, select the“Broadgun pdfMachine printer” and that’s it! Get yours now!
A leader line is a line referring to a feature (dimension, object, outline, etc.).
Fig. 11 Termination of leader lines
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
Fig. 12 Dimensioning several arcs Fig. 13 Unbroken dimension line
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
When several arcs are dimensioned, it is preferable that separate leaders be used rather than extending the leaders (Fig. 12).
A dimension line should be shown unbroken, even where the feature to which it refers is shown broken (Fig. 13).
Dimension lines should show distinct termination, in the form of an arrow heads or oblique strokes or where applicable, an origin indication (Fig. 14). The size of the termination should be proportionate to the size of the drawing on which it is used. One style of termination only should be used on a single drawing. However, where space is too small for an arrow head, the oblique stroke or a dot may be substituted.
A pdf writer that produces quality PDF files with ease!pdfMachine Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click “print”, select the
