2. Incompatibility among representations
Complex CAD/CAM systems
Shape, non-shape, design and manufacturing
data
Need to integrate and automate design and
manufacturing processes to obtain maximum
benefits from CAD/CAM systems
Direct translators and neutral formats
Arvind Deshpande(VJTI) 4/10/2012 2
5. The main objectives that were put forward for
GKS are:
– To provide the complete range of graphical
facilities in 2D, including the interactive
capabilities,
– To control all types of graphic devices such as
plotters and display devices in a consistent
manner,
– To be small enough for a variety of programs
Arvind Deshpande(VJTI) 4/10/2012 5
11. IGES is the most comprehensive standard and
is designed to transmit the entire product
definition including that of manufacturing
and any other associated information
Arvind Deshpande(VJTI) 4/10/2012 11
14. 1. Flag section – Optional
ASCII/binary/compressed ASCII
2. Start section(S) – Man readable prologue
3. Global section(G) – Details of product,
person originating the product, name of the
company originating it, date, details of
system which generated it, drafting
standard used etc.
4. Directory section(D) – Index for the file and
attribute information like colour, line type
etc.
Arvind Deshpande(VJTI) 4/10/2012 14
15. 5. Parameter Entry section(P)
Geometric entities- Point, line, arc, different
surfaces, curves, solid primitives etc.
Annotation entities – Angular dimension,
diameter dimension, label, note, etc.
Structure entities – Associativity definition,
text font definition, color definition, units
data etc.
6. Terminate section – Sub-totals of record in
each of earlier sections
Arvind Deshpande(VJTI) 4/10/2012 15
16. The broad scope of STEP is as follows:
– The standard method of representing the
information necessary to completely define
a product throughout its entire life, i.e.,
from the product conception to the end of
useful life.
– Standard methods for exchanging the data
electronically between two different
systems.
Arvind Deshpande(VJTI) 4/10/2012 16
20. The DXF format has been developed
and supported by Autodesk for use with
the AutoCAD drawing files.
Arvind Deshpande(VJTI) 4/10/2012 20
21. A coordinate measuring machine is a dimensional
measuring device, designed to move the measuring
probe to determine the coordinates along the surface
of the work piece. Apart from dimensional
measurement, these machines are also used for
profile measurement, angularity, digitizing or
imaging.
A CMM consists of four main components: the
machine, measuring probe, control system and the
measuring software. The control system in a CMM
performs the function of a live interaction between
various machine drives, displacement transducers,
probing systems and the peripheral devices.
Arvind Deshpande(VJTI) 4/10/2012 21
22. Control systems can be classified according to
the following groups of CMMs.
1. Manually driven CMMs
2. Motorized CMMs with automatic probing
systems
3. Direct computer controlled (DCC) CMMs
4. CMMs linked with CAD, CAM and FMS etc.
The first two methods are very common and self
explanatory. In the case of DCC CMMs, the
computer control is responsible for the
movement of the slides, readout from
displacement transducers and data
communication.
Arvind Deshpande(VJTI) 4/10/2012 22
23. Cantilever Gantry type
type CMM CMM
Arvind Deshpande(VJTI) 4/10/2012 23
24. Dimensional Measurement Interface
Specification (DMIS) is a new standard
in communication being established by
CAM-I for manufacturing.
Arvind Deshpande(VJTI) 4/10/2012 24
26. Function:Specifies a circularity tolerance for a
feature, and assigns to it a label.
• Format: T(label) = TOL/CIRLTY, tolzon,
var_1, F(label)
• var_1 can be: MMC or: LMC or: RFS
• label is an alphanumeric label assigned
to the tolerance, and is up to 10 characters
in length.
Arvind Deshpande(VJTI) 4/10/2012 26
