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Scaling dimensions

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ronan walsh25/03/2019 20:04:39
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Is scaling a drawing up or down a simple matter of multiplying or dividing the given dimensions by a set figure, say 2x or 4x ?

Or is it as i suspect more involved than that ?

JasonB25/03/2019 20:07:00
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That's all there is to it.

You may find you need to tweak some sizes to match available stock sizes

Mike Poole25/03/2019 20:35:00
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Scaling down can sometimes make thing overly flimsy so it may be worth having a think whether the part will have sufficient strength after scaling if it has to work at the reduced scale. I think the same occurs when scaling up thing can be overly chunky and stronger than required.

Mike

ronan walsh25/03/2019 21:18:00
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Well it will be upscaling i will be doing most likely, i see a design for a simple steam engine, but its a bit small for my machines and i prefer larger models anyway.

Jim Nic25/03/2019 22:02:21
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I scaled up this Mogens Kilde designed Double Diagonal engine by two by simply doubling the drawing dimensions and found that while most aspects looked OK at twice design size, the fasteners most definitely did not. Bigger - yes, but not twice as big. I actually used BA fastenings instead of the metric called for on the drawings and just chose sizes I thought would look right and took the view that for an air powered model whatever I chose would would be strong enough.

99 finished 1.jpg

99 finished 2.jpg

Jim

Edited By Jim Nic on 25/03/2019 22:04:23

Neil Wyatt26/03/2019 09:41:27
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Posted by ronan walsh on 25/03/2019 20:04:39:

Is scaling a drawing up or down a simple matter of multiplying or dividing the given dimensions by a set figure, say 2x or 4x ?

Or is it as i suspect more involved than that ?

In principle, but you may find things start to look a bit chunky, especially fixings. Also as Jason says, convenient stock sizes may not be available.

Neil

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