It is best to use 1:1 ratio to draw as you can easily adjust the output ratio. The drawing ratio is different from the output ratio. If you use "1 unit outputted=10 units in the drawing”, the drawing will be outputted in 1/10 scale. Seemly, if you use “10 units outputted=1 unit in the drawing”, the drawing will be outputted 10 times larger.
There are many advantages if you use 1:1 ratio.
Firstly, it is easy to find errors. As you draw due to the actual size, it is easy to find the unreasonable size setting. Secondly, it is very convenient to dimension. The software can measure the dimension automatically. If you draw with a wrong ratio, you can check the dimension number and discover the error quickly. Thirdly, it is easy to adjust the block dimension if you copy part of the graphic or use the block as they are all draw in 1:1 ratio. Fourthly, it is convenient to make up the assembly drawing or dismantle the assembly drawing into parts diagram. Fifthly, it helps to improve work efficiency as you don’t need to calculate the cumbersome ratio to zoom in or zoom out. 1:1 drawing ratio can help to avoid the errors when you converse the ratio.
3d drafting programs
3d cad Professional