The need for a drafting standard - an excellent backgroud paper
There are many different ways to work with landscape CAD drawings. If you are working professionally, it makes sense to develop your drawings in much the same way for each job. This 'paper' aims to provide the rudiments of a drawing standard for an Australian landscape design office. In no way do we suggest that this document is a bible on how things should be done. It simply canvasses some of the issues that should be discussed in your office before creating such a document..
Best practice - layering
After visiting the client and winning approval to prepare a design, the company creates a job card using some type of JobRegister application located on the company server. This application allows hours worked on particular drawings to be logged and ensures that the drawings, documents, photographs and other material is filed in the same way for every job and that records can be found easily by any company employee.
No design work will be started unless a job card has been created.
Each job shall have its own folder stored on the server. That folder shall be located under a folder according to year (2014, 2015, 2016 etc.) and in a folder named after the client e.g referring to the example above, the folder would be called Jason Dunstan. multiple jobs for that client can be stored in that folder, but jobs for Jason Dunstan in a following year will be stored under the appropriate year folder.
List the software and versions of the applications in use by your office. For example:
The sub headings below cover the use of CAD software to deliver sets of 2D landscape plans to the client.
A template called ULD has been added to the gCADPlus template set. All new designs for a client will start with this template as a base.
to add entities (work) in either model space or paper space. This standard specifies the site will be laid out in model space and layout (paper) space will only use be used for presentation. Layouts will contain title blocks and perhaps illustrative images.
In Australia, the building trade expects drawings to be dimensioned in millimeters, so our ULD always uses mm as the base unit. This means that any enquiry of the drawing (such as the use of the distance or area command to measure the width of a path or the area of paving) should return values in real world (mm) units.
Tip: If we receive a drawing from a survey firm, it will likely be drawn in meters as the base, so we open the drawing separately and scale the insert the drawing by 1000, making sure that coordinate 0,0 is chosen as the base coordinate to scale about.
Our designs provide much valuable information to construction teams. This standard calls for a drawing to have coordinate 0,0 set at a confidently point for setting out.
Plot scales, text height etc.
Tip: Using the inbuilt gCADPlus SavePDF writer to get a quick check print.
The table below offers suggestions on appropriate text heights for intended plot scales. Here we assume that you are working in the metric field with mm as your base unit and intend to plot to an A1 sheet in layout space. Note that AS1100, (the Australian Standard for Technical drawings) allows only those scale factors listed below. Even though it can be tempting, try and avoid non standard scales such as 1:25, 1:250, 1:75 etc. These are not an approved scale according to the Australian Standard..
|SCALE||2.5 MM TEXT||3.5 MM TEXT||5 MM TEXT||
PAGES - PAPER SPACE
PLOT SCALE FACTOR
We suggest that general notes should be 2.5 mm final plot height, titles at 5 mm or 7 mm final height.
It is a good idea to set up a series of dimension styles for printing at different scales. Use different dimensioning styles for dimensioning at different printed scales.
Try and ensure that all layer names and colors remain similar across all CAD drawings made by your practice.
The practice uses the layer names based on the system developed by the Task Force on CAD Layer Guidelines sponsored by the American Institute of Architects and other related professional bodies. The major groups are:
The task force recommends a dash as a detail separator as thus L-IRRIG rather than the non preferred underscore).
The default set of layers in a new drawing might be set up as shown in the figure below.
When plant symbols are inserted into a drawing from the gCADPlus plant selector (general set), two more layers are automatically created. L-PLNT-SYMBOL, L-PLNT-CONSTRUCTION,
Where a drawing is to be presented at different scales (e. g. planting plans) put notes on a different layer i.e.
These should be created as separate drawings and drawn full size 1:1. Name details appropriately and add to the gCADPlus Details folder under BLOCKs.
If you do need to adjust the thickness of a line (or layer), here are some suggested line weights to try:
A3 sheets - 0.09, 0.15, 0.18, 0.2, 0.25, 0.3, 0.4 (in mm)
A1 sheets - 0.1, 0.15, 0.2, 0.25, 0.35, 0.45 (in mm)
gCAD+ encourages you to file drawings in a Jobs folder. We recommend creating a new folder for each calendar year - 2012, 2013, 2014 etc. Each job is placed in a folder named after the client name e. g. JohnDoe. Design development file numbers should be consistent for each job e. g. the first file for the job above should be called DesignDevelopmemt01
Drawing sheet names
Concept layout names
Concept01, Concept02 etc.
Starting a new drawing
Prepare a new drawing from a template that you have made. This template might be modified from one of the templates supplied with gCAD+ and contains all the text and dimension styles that the practice uses. The template should be stored in the template folder and possibly made a read only file.
If you have been given a base drawing from a survey firm, first check the units. If the units are meter, scale the drawing by 1000.
Attach a survey drawing as a block. Remember that a block can be rotated to line up with (say) north or a major road.
Some Imperial scale factors.
|1:192 (1/16" = 1 foot)||0.005208|
|1:128 (3/32" = 1 foot)||0.007813|
|1:96 (1/8" =1 foot)||0.010417|
|1:64 (3/16" = 1 foot)||0.015625|
|1:48 (1/4" = 1 foot)||0.020833|
|1:32 (1/8" = 1 foot)||0.03125|
|1:24 (1/4" = 1 foot)||0.04166|
|1:16 (3/4" = 1 foot)||0.0625|
|1:12 (1/2" = 1 foot)||0.0833|
It is really important to protect your valuable data. It can be devastating to lose information and have to recreate it. This paper offers some suggestions on how to avoid data loss: http://plus.gardencad.net/?q=content/backup-data