There are two main ways of drawing.
Precision drawing where every line and origin point is entered precisely, usually by typing in on a command line or drop down box the required length etc.
Then there is the Old Fogey way where you draw two lines at 90 degrees to one another and then proceed to offset these lines to become construction lines, later they are trimmed , filleted, chamfered etc to form the part you are drawing.
Sounds familiar ? Well that’s just how most of us were taught using a drawing board all those centuries ago.
Some are better / faster / more comfortable with method 1, others with method 2.
How easy it is to draw in CAD is also down to how the program is setup. John mentions “Dimscale” above as an example, often called other things on other programs. In CAD you always draw full size and do not scale. We only used to scale drawings to fit on the paper but the computer doesn’t need to do this with zoom commands etc.
So say you are drawing a part for your O gauge locomotive and said part is 20mm square roughly and you have a few drawing to do all similar.
You start a drawing, draw say the square, set colours for different line types, set text size and dimension sizes so they are relative to the part, you don’t want massive letters on a 20mm long part.
Once you have got these settings done, delete the drawing and save the blank drawing as a template.
Next time you want to draw in O gauge, open this template and immediately rename you new drawings as “Widget O gauge ” etc and all the setting has been done for you and you still have the original template for next time.
It’s small things such as this that whilst costing initial setup time will pay back in spades over a short period of time.
There are also whole libraries of pre drawn parts available for import which can save you hours later or you can save parts of an existing drawing as a part for reuse.
Over a 100 million pre drawn parts already done for you for free.
Nuts and bolts if you ever have to draw one as opposed to using a library file, you only draw once then import or copy.
Edited By John Stevenson on 27/06/2011 07:36:52