Page 287 - Aeronautical Engineer Data Book

Basic mechanical design 233
defined in critical areas. It produces better
accuracy.
• Finite Difference Method: A traditional
method which has now been superseded by
other techniques. It is still used in some
specialized areas of simulation in fluid
mechanics.

12.7.4 Useful references
Standards: Limits, tolerances and surface
texture
1. ANSI Z17.1: 1976: Preferred numbers.
2. ANSI B4.2: 1999: Preferred metric limits and
fits.
3. ANSI B4.3: 1999: General tolerances for
metric dimensioned products.
4. ANSI/ASME Y14.5.1 M: 1999: Dimension­
ing and Tolerances – mathematical defini­
tions of principles.
5. ASME B4.1: 1999: Preferred limits and fits
for cylindrical parts.
6. ASME B46.1: 1995: Surface texture (surface
roughness, waviness and lay)
7. ISO 286–1: 1988: ISO system of limits and fits.
Standards: Screw threads
1. ASME B1.1: 1989: Unified inch screw
threads (UN and UNR forms).
2. ASME B1.2: 1991: Gauges and gauging for
unified screw threads.
3. ASME B1.3M: 1992: Screw thread gauging
systems for dimensional acceptability – inch
and metric screws.
4. ASME B1.13: 1995: Metric screw threads.
5. ISO 5864: 1993: ISO inch screw threads –
allowances and tolerances.
Websites
1. For a general introduction to types of
CAD/CAM go to ‘The Engineering Zone’ at
www.flinthills.com/~ramsdale/EngZone/cad
cam.htm. This site also contains lists of links
to popular journal sites such as CAD/CAM
magazine and CAE magazine.