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Author Topic: Scale as a percentage  (Read 2085 times)

Capt Podge

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Scale as a percentage
« on: December 16, 2015, 05:00:34 PM »

I've acquired a set of plans.
 
The GA profile is 1/48 scale
The GA deck view is 1/48 scale
The lines plan is 1/16 scale.
 
Contacted the print shop to ask about getting the lines plan reduced from 1/16 to 1/48 - the answer I got was "yes, we can do that - what percentage do you want it reduced by" ?
 
....well, that struck me dumb, can anyone give me the answer please ?
 
Apologies in advance if this has been covered before.
 
Regards,
 
Ray.
 
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inertia

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Re: Scale as a percentage
« Reply #1 on: December 16, 2015, 05:25:08 PM »

Ray
1/48 is a third as big as 1/16 (3 x 1/48= 3/48 = 1/16) so percentage BY is 66.66% (2/3), whereas percentage TO is 33.33% (1/3). That will probably confuse the bejesus out of them, so just tell them you want it 33.33% (or a third) the size of the original. Bet they still get wrong!
Dave M
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Capt Podge

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Re: Scale as a percentage
« Reply #2 on: December 16, 2015, 05:30:58 PM »

Thanks for that Dave. I was thinking along those lines myself but was concerned my sums were out. :embarrassed:
 
Regards,
 
Ray.
 
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reg

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Re: Scale as a percentage
« Reply #3 on: December 16, 2015, 06:01:55 PM »

I just draw 2 lines on the plan the size I want  the hull to be and tell the guy to get on with it
if thay can't do that I go to another copy shop
    Reg
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Capt Podge

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Re: Scale as a percentage
« Reply #4 on: December 16, 2015, 06:13:00 PM »

Yep, that makes sense Reg - thanks for that.
Unfortunately there aren't that many in the area with the equipment to deal with a 14ft long roll of paper. It's something to do with the scanner memory capacity, so I'm told.
It may be that I'll have to cut it...we'll see.
 
I'll update on here when I've got the job done. O0
 
Regards,
 
Ray.
 
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Netleyned

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Re: Scale as a percentage
« Reply #5 on: December 16, 2015, 06:26:13 PM »

Before the plan is scanned, draw a line on it
in a few places along the roll of exactly 30 inches.
The reduced plan should show these as 10 inches.
Measuring these will show the linear accuracy on
a 14 ft length of scan.


Ned
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Capt Podge

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Re: Scale as a percentage
« Reply #6 on: December 16, 2015, 06:47:43 PM »

Ned - that's brilliant, simply brilliant.
 
That way I'll be sure they have got it right - nice one. :-))
 
Regards,
 
Ray.
 
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grendel

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Re: Scale as a percentage
« Reply #7 on: December 16, 2015, 08:34:07 PM »

There may well be some stretch on the length of the plan, these scanners are generally rated to about 0.5% accuracy (1mm every 200mm, so the finished result can be slightly off we generally reckoned about 5mm over an A0 plan. they can be calibrated to better accuracy, but the copy shops hate doing it as it costs time and money. draw a line in both directions and measure both of them. then expect to print a second copy to get it spot on.
Grendel
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Capt Podge

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Re: Scale as a percentage
« Reply #8 on: December 16, 2015, 08:44:12 PM »

That's another good point Grendel - I'll ensure that gets done as well. <*< :-))
 
Regards,
 
Ray.
 
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essex2visuvesi

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Re: Scale as a percentage
« Reply #9 on: December 17, 2015, 08:13:04 AM »

When you draw the reference lines make sure you do them in both directions (ie horizontally and vertically)
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Capt Podge

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Re: Scale as a percentage
« Reply #10 on: December 17, 2015, 04:42:03 PM »

When you draw the reference lines make sure you do them in both directions (ie horizontally and vertically)

 :-)) :-)) :-))
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