How do I transfer line thickness when scaling + how do I get the right size when printing?

[ixandra2012]

Hello,

I have designed a few logos (geometric 2D-Designs) with QCAD Pro and I have 2 Problems:

1)The outer shape of every logo is a circle. How do I print it on A4 paper with exact radius of 18cm? Even if I scale it to radius 18cm and use scaling 1:1 it is always 2 or 3cm bigger

2)When I scale a logo with outer circle 8cm to outer circle 18cm, how can I keep the thickness of the lines to maintain those proportions too? My logo with the 8cm is made from 2mm thick lines and it looks really awkward when scaled to 18cm, because the lines look so thin now.

Thanks a lot already,
Regards
IX

[andrew]

1)The outer shape of every logo is a circle. How do I print it on A4 paper with exact radius of 18cm? Even if I scale it to radius 18cm and use scaling 1:1 it is always 2 or 3cm bigger

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2)When I scale a logo with outer circle 8cm to outer circle 18cm, how can I keep the thickness of the lines to maintain those proportions too? My logo with the 8cm is made from 2mm thick lines and it looks really awkward when scaled to 18cm, because the lines look so thin now.

In CAD, a 2mm line is a 2mm line, regardless of scaling.

If you need line weight to scale with geometry, you'd have to create a filled area instead. I.e. draw the inner circle and outer circle, select both and use Draw > Hatch with solid fill to fill the space between.