1) Line types - centreline, long dash - dot is now the preferred line format. Fold lines - long dash - double dot. I'm trying to work on a pen table to fix this. The definition is clearest in ISO 128-21 guidance for CAD drawings.
I try to avoid drawings, they are no longer so important with the move to drect manufacture from the CAD model. I really wish exam boards would scale down (excuse the pun) drawing content and introduce more simulation and analysis which are the really useful tools for improving designs.
The guru on drawings was John Forth. He did all the initial development work setting up BS8888 standards and drawing templates. Adam Haas took that and setup configurations for standards in different parts of the world and Chris Carr continues this work so Chris is the one who will make the changes to the new configs.
I hear what your saying Tim and as I'm sure you know only too well, exam boards are like a supertanker that's out of radio contact. If the message gets through at all they take an awful long time to swing round. John's work was good but for many years we've used the templates I developed along with our own in house configuration utility & creo standards. We also shared these on request with other schools we had trained or had contact with. This started before WF/Creo even had a schools configuration utility. Our exam board is now getting picky again about legacy centrelines, leaders and other non conforming drawing artefacts.
Most companies I visit/interact with use drawings to a BS/ISO convention and it is expected that technicians/enginers/graduate engineers can read/understand/modify/update them with the same conventions.
PC screens tend to have approximately 1000x1000pixels only in the drawing area, most printers are at least 300+ dpi and therefore even a A4 drawing tends to show up interferences, gaps etc. much more easily than the screen (even with global clearances ...) [NB Retina displays approach 300 dpi and good quality 1200dpi lasers are phenominal!]
Watching students put together assemblies and modify parts it is amazing to see how much quicker they approach a final solution when they have an updatable orthographic drawing (part and/or assembly) beside them to sketch on, estimate distances, place components on, discuss with peers....
I tend to suggest to students to always sketch preliminary designs on graphpaper, which helps with their drawing skills, scaling etc. as well as reducing the time entering sketches/dimensions/fits etc in CAD. [Printing simple orthographic drawings on feint graph paper can also help understanding scales, fits etc, without needing to generate fully dimensioned drawings, during the development/embodiment stages]
While direct manufacture is certainly on the way the discipline of generating a well dimensioned drawing emphasises to the user the physical size of a component, potential load paths and manufacturability. The number of components I get to 3D print which have features under/over designed, non-manufacturable, is getting worse. The pseudo 3D representation of a component on screen is very seductive but potentially wasteful of time and energy. It is very interesting to get a students reaction after playing back a sessions Trail File to show them how they have interacted with a model. It often results in a significant change in system usage!
James Collin has produced some fantastic Creo standards files that everyone in Edinburgh is using. It would be great if they could be updated in light of the SQA's recent approach to drawing standards.
BS 8888 defines the requirements for the technical specification of products and their component parts. The standard explains the way in which engineering drawings outline and present these specifications, and covers all of the symbology and information that engineers and designers need to include on their drawings, whether they are produced in 2D or in 3D, created using CAD systems and 3D modelling.
Acting as a navigational roadmap to the ISO standards, BS 8888 provides information engineers need on a regular basis, including the nuts and bolts of engineering specification. The revised standard aims to help UK industry move over more fully to the ISO system of geometrical product specification, and is based on the ISO GPS system of product specification standards. BS 8888 brings together all international standards needed to prepare technical product specifications. The standard aims to assist UK industry to use the 200 or more international standards on documentation, specification, and verification.
The updated standard is expected to be particularly useful to mechanical engineers, engineering designers, and design engineers in the UK, working in engineering and manufacturing companies, particularly in defence, aerospace, automotive, rail, nuclear and other general manufacturing sectors. Essentially, any engineering drawing should comply with the requirements of BS 8888. Independent design consultancies or design agencies are also set to benefit from BS 8888.
These pages include various standards. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use BSI Shop. It is also possible to become a BSI member and obtain copies of the Standards at much reduced prices.
Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies.
Technical standards exist to provide glossaries of abbreviations, acronyms, and symbols that may be found on engineering drawings. Many corporations have such standards, which define some terms and symbols specific to them; on the national and international level, ASME standard Y14.38 is one of the widely used standards.
On a technical drawing a dimension or note that is given only for reference and therefore is not intended to be used as a part acceptance criterion (although it may be used as an aid to production or inspection). Parenethesis( value ) denote the same thing and were standardized by ASME.
I found some drawing created in public service on model space line wight 0.3,.35,0.5 very thickhow can change very thin lines to bring right line weight I try to draw from particular drawing click line tool it come big thick line how ride off
You need to set anything you want to be standard across any drawing you start should be set up in your dwt file. This can be selected from the drop down box when you "open drawing". Change what you need and save it then all drawings started with that template will have their basic settings the same.
Having said all that I don't think AutoCAD has a hook to BS8888. BS8888 is the standard that all UK draughtsmen should work to. It is also closly aligned with the European standard (number escapes me) so all European drawings should at least be similar. It is the standard for DRAWING - irrespective of how the drawing was produced. It is sometime since I read it but it did contain a section specifically for CAD but most of it is about size of text, dimensioning, weight of printed lines, shape of graphical symbols etc. Some of this can be set up in advance. It also explains projection over which AutoCAD has no control, that is down to the draughtsman.
"The kits can be procured from British Standards Publishing, see link below, or they are available for reference in the UK at Central Libraries. British Standards also sell a CD which includes all of BS 8888 and all of the associated standards.."
If it is obvious that the shape is square, a symbol my be used to dimension the size (similar to the way the Ø symbol is used), or "SQ" or "SQUARE" added to the dimension (if following ANSI or ASME standards).
Design, development, manufacturing, assembly and quality engineers, CMM and CNC programmers, tool designers, toolmakers, technicians, inspectors, buyers and technical project managers. In short anyone who creates , reads or edits mechanical part drawings and models. 2b1af7f3a8