acad scales

Allen Thompson wrote: > I changed a small section of a drawing to a hidden (dashed) line but when > printed it came out as a solid line again. Any ideas why this
happened? -Al previous replies are correct, but like many other things in autocad, the picture is seldom complete because there are so many different ways to achieve the same effect on screen.
I will attempt a comprehensive reply.
when I am in model space I set my ltscale to a number based on the scale I wish to plot at - usually 1/4"=1'-0". multiply the inverse of my desired output-on-paper scale by 12. ( 4 * 12 ) = 48
I set my ltscale in model space to 48. this only changes the on screen appearene in model space.
I plot from paper space and scale the view through the window by the inverse of my LTSCALE in model space and what plots is the same as what I am used to looking at on screen. you have to add the suffix XP. I scale my viewports in paper space 1/48XP for a 1/4" = 1' drawing.
for 1/8 scale the magic number is 96. for the oddball 3/16 it's 64. those I use often enough to remember.
for this to work right, I have to change my ltscale to 1 before I plot. and PSLTSCALE is a variable that turns paperspace scaling OFF and ON. if memory servers, I just leave mine on - controlling the plot scale by scaling the views in the viewports.
my magic numbers work because I want someone to be able to lay an architect's scale on the plan and read the 1/4" = 1' side. engineers scales read 1 to 20 or 1 to 10 or 1 to 30...... increments of ten. and ususally it means 1" = 20' - 0" for my site plans. the contractor reading the floor plans will use an architect's scale, and the one reading the site plan will expect an engineer's scale.
there is a factor of 12 involved. so to plot to an engineer's scale, I would scale my viewport 1/240XP.
draw your model full scale and work out the ratios so that you get what you excpect to see when you plot. play with it. if you conform to standards, I am betting that soon you will be in danger of forgetting the processes of fiinding your magic numbers. it's the sort of thing you set up once and forget about.
actually, I hope you did not need this at all. going for coffee now.
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