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2D drawings have been the backbone of communication ever since an idea needed to be saved - it goes back a very long way...
Help] So I Made A 3d Model In Designspark Mechanical...
To define a part, dimensions (features of size) and notes are combined with Geometrical Dimensions and Tolerancing (GDT), which in totality quantify permitted errors of inaccuracy in manufacturing, thus producing an economical part meeting design criteria.
Dimensioning and applying GD&T is the mechanical universal language understood by specifiers and manufacturing engineers. An intentioned imprecise, wide tolerance and lowest cost part, requires similar specifying as a precise, narrow tolerance and high-cost part.
The latest offering in Mechanical CAD is Model Based Definition (MBD). 3D models having Geometrical Dimensions and Tolerancing (GD&T) with Process Manufacturing Information (PMI) applied directly to it as a way of imparting information to reduce / negate the requirement for 2D drawings.
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DesignSpark Mechanical provides both traditional 2D drawings, annotating with GD&T symbols (annotation and encoded sematic types) and 3D MBD based on the American standard ASME Y14.5 (2009) and Y14.41 with symbol encoding semantic creation methods. Semantic encoding guides the correct symbol formulation which assists in understanding GD&T underlying theory and principles.
Multi-national and major manufacturing organisations have very efficient 'data' information paths - MBD data minimises product definition time thus shortening time to production. It should be noted that small manufacturing companies may not have the technical skill nor the technology to exploit MBD data, therefore the traditional 2D dimensional and noted drawing with GD&T definition is still necessary to fully define the component. It is envisaged that a part drawing (paper or image) supplied with a 3D model (STEP file) will be common practice for the foreseeable future.
2D drawings can in addition to the above, define all supplementary manufacturing information needed to manufacture the part. Information such as specific part material characteristics e.g. Fibre direction / areas of hardness or softness / plating / post plating machining /sand ~ vapour blasting /painting areas, in-process part dimensions, inspection set-up datum targets are a few common aspects of mechanical part manufacturing information that can be easily defined or referenced in a drawing with notes and additional dimensions for explicit communication. Also, drawings with separate ( scalable / detail / broken ) aspect views, may better emphasise to the viewer, particular individual or related requirements in preference to an on-screen 3D part / assembly model.
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The way a drawing is set out and depicted with defining symbols isn't part of this article. Dimensions, tolerances and GD&T symbols all require understanding and application principles.
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Custom Formatted Drawing Sheets for company standards and logo with definable input fields for repeated / efficient standard data entry and notes. Example GIF below showing Title block set as file name with Material and Coating information cut and paste from a preferred material / process list, other text, select field and enter text. Text position and size is set in the custom format sheet.
The Designspark Mechanical Interface
Custom Document Properties e.g. 'Used On' and 'Similar To' created in the drawing custom sheet with assigned / associated text fields can by manual entry, record documents, facilitating file search and load. Custom document properties are user definable and may list e.g part material, drawn date, drawing issue, etc. See example in GIF below:
Change Control. Alterations auto propagate on 'save' to all external inserted files within other files (assemblies). Alternatively, for manual individual external file replacement (exchanging inserted file source), choose file 'save as' with copy and replace original file. This facilitates document history and retrieval processes.
Internal Components and their Drawings: During a new design process, usually sketches make faces and faces are pulled into bodies which can be added to or removed from other bodies and made (moved) to a new component. Bodies and components can be moved/ re-ordered, deleted and combined with other bodies of different components as the design evolves.
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Working only with Internal components, there is total freedom to change anything; you can completely reorder the design and its structure etc. is wholly contained within the (parent) file upon saving.
Bodies and their owning Component together with their data are Internal to its parent file and any associated Drawing Sheet attached to it, even if opening the component (recommended), resides wholly within the parent file allowing one convenient file data location with model /drawing change management convenience.
When a component is opened, all the drawing sheets of its parent file are also shown - this facilitates convenient opening to reference drawings dimensions or notes, the latter may be copied and pasted for drawing creation efficiency. See image above.
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Adding new drawing sheets to Internal components (open each component to add the new sheet) adds a new sheet to the parent file - hence the structure browser reports Drawing 1... Sheet 1, Sheet 2 ... Sheet 5 however this can be fully manually edited for selection / opening as shown in the below image.
Any imported external component with a subsequent change of 'source' command>Use Internal copy, will also copy-import any associated drawing sheet with the Structure Browser showing as 'Drawing 1 (or 2, 3 depending on original Component/Sheet save)'...Sheet 1 - renaming is advised.
The copied external files custom document information migrates into custom component information as it has lost its original document. Any drawing sheet copied will transfer with its original sheet format - this format must be deleted and replaced for an Internal component format or upon data entry in its pre set text fields, this data will populate to all other internal components (document property) incorrectly, necessitating an incorrect and unnecessary search and deletion of document property fields.
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Note the formatted drawing sheet shown below, has itself been externally referenced, however it may be removed with the drawing sheet having no format, or again, the sheet can be formatted to any style with its file on disc location located anywhere for convenience. Individual drawing information, e.g. material, finish or drawing revision control is by manual text entry only otherwise group drawing information, (commonality across all drawing sheets) i.e. material, finish or drawing revision control etc will propagate to all sheets of the 'Drawing 1' - custom sheet format or no format etc. controls this behaviour.
Manual standard inputs (probably different information required for each sheet) can be accelerated by cut and paste techniques. Structure Browser standard sheet information, are all edited manually / renamed.
Note: Although when saving the parent file, the drawing sheets may have different drawing revs - it is not possible to save individual components and their associated drawing sheets together at particular revisions, as all drawings are owned by the parent file - that fact alone would in many situations restrict Internal components to prototyping / development.
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It is recommended that if an Internal file with a drawing is likely or intended to be converted into an External reference file with its own associated drawing at some future time, and if wanting to preserve the dimensioning (considered only beneficial with numerous complex details), its body dimensions with tolerances are made in annotation planes on the opened component. These then can carry over when making the component external and can be used in drawing views without the necessity to duplicate all dimensioning. It is also recommended to consider making the component external after designing is finished for change management / model and drawing individual filing i.e. for production manufacture or outsourcing.
If requiring single component files with associated drawing sheets, allowing the saving and retrieval at particular issuing points, convert all Internal components into External components, opening each individually and add a new drawing with a custom format.
An Initial Internal component with an associated Drawing sheet, may still be converted to an External file and its Drawing sheet can still remain within the original parent file with model to drawing associative link intact, but this is not recommended although possible.
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External Components and their Drawings: During the design process, other existing components may be imported into the active file, known as an External Component referenced file, it may be (if not locked), modified with all of its (un-opened/ potentially unknown) on-disk Instances simultaneously changing on saving, so care is required...If making an Internal copy of an External component (say a small variation is required), this solves the file linking but increases the file data size.
Files consisting of an assembly with many External component references, are data small compared to assemblies with Internal components partly due to the drawing sheets being separated / isolated from its External component model instance. Opening the External component is required to view its drawing.
Drawings of External components can contain more part / drawing data - entering
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