Conversion Question

[ANDY0871]

I occassionally receive drawings at a scale I don’t want to use. Usually its an easy conversion. Like 1/16” to 1/8” or something. Blow it up by %200 and get your 1/8”…But when dealing with other fractions. Like from 3/32” to 1/8”. The math is a little more involved. Is there a chart out there for this? It would make doing conversions much easier..I guess this isnt a Cad question. It's more when I receive pdfs or something. But I figured who better to ask then Cad people.

[dumfatnhappy]

here are the scale factors (not including metric) which should help you

>ARCHITECTURAL
Full 1
6"=1' 2
3"=1' 4
1 1/2"=1' 8
1"=1' 12
3/4"=1' 16
1/2"=1' 24
3/8"=1' 32
1/4"=1' 48
3/16"=1' 64
1/8"=1' 96
3/32"=1' 128
1/16"=1' 192
1/32"=1" 384
>CIVIL
1"=10' 10
1"=20' 20
1"=30' 30
1"=40' 40
1"=50' 60
1"=60' 70
1"=80' 90
1"=100' 100

[SLW210]

Here is a little TABLE you can use.

[StykFacE]

here are the scale factors (not including metric) which should help you

>ARCHITECTURAL
Full 1
6"=1' 2
3"=1' 4
1 1/2"=1' 8
1"=1' 12
3/4"=1' 16
1/2"=1' 24
3/8"=1' 32
1/4"=1' 48
3/16"=1' 64
1/8"=1' 96
3/32"=1' 128
1/16"=1' 192
1/32"=1" 384
>CIVIL
1"=10' 10
1"=20' 20
1"=30' 30
1"=40' 40
1"=50' 60
1"=60' 70
1"=80' 90
1"=100' 100
Correct me if I'm wrong, but under the Civil scales, aren't those incorrect? For instance, shouldn't 1" = 10'-0" be a scale of 120? Because 1" x 120 = 120" divided by 12" = 10'. :unsure: :)

[dumfatnhappy]

not in the civil world.....in an architectural world you are correct (scaled up by 12), otherwise its just plain units... not inches.

[StykFacE]

oh okay, so I'm assuming the scale works differently in the Autodesk Civil application then, correct? and now that you mention it I remember my friend (who's in excavation here in Dallas) says that they go by Ten's instead of Inches/Feet/etc for their measurements. :oops:

[dumfatnhappy]

correct. any "civil" plan has to be scaled up by 12 to be usable in say a mechanical/electrical plan. and yes...elevations as well are in decimal (i.e. 623.83' as opposed to 623'-10")

[dumfatnhappy]

and vice versa btw..... I'm mech. but have been known to play a dirt merchant every now and again.....but really hate it. ;-)

[Alan Cullen]

Does this mean I have to learn Imperial scales so I can communicate here? Nah, I don't think I'll bother. :lol:

Here, it's much the same, pretty much all disciplines use millimetres. Except us civil blokes and surveyors. We use metres. So when we get a drawing from say architects, we have to scale it down by 0.001 to get it back to metres, 1/1000.

Then we have to muck around moving and rotating it to get it back onto a mapping grid. But that's another story.:lol:

[dumfatnhappy]

ahhh...state plain coordinates perhaps? :o I *finally* got educated in metric while in Abu Dahbi this past summer. took me 3 months to deprogram from that. :?

note to self: self! NEVER play golf there in june, july or August again.......