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Old 07-30-2018, 12:51 AM
John Wagenseil John Wagenseil is offline
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An app for estimating the area of a paper model part

A polar planimeter simulator that can be used to estimate the area of a paper model part.


Polar Planimeter


This is a simulation of ancient technology.
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Old 07-30-2018, 01:30 AM
John Wagenseil John Wagenseil is offline
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This brings back memories, I still prefer RPN over algebraic entry.
HP Calculator Simulations
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Old 07-30-2018, 05:23 AM
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airdave airdave is offline
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Just curious, what is the reason for knowing the area of a part?
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Old 07-30-2018, 08:26 AM
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Historically, The planimeter was used to measure the area drawn on a steam engine indicator card.

The measurement could then be used to determine the efficiency of the steam engine and indicate potential problems within the steam engine.

If a paper model designer wanted to know the minimum number of pages which would hold the model, the sum of the areas of all of the parts would indicate the theoretical minimum number of pages which could hold the model.
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Old 07-30-2018, 06:48 PM
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Quote:
Originally Posted by Zakopious View Post

If a paper model designer wanted to know the minimum number of pages which would hold the model, the sum of the areas of all of the parts would indicate the theoretical minimum number of pages which could hold the model.
Assuming every part was a perfect square or rectangle maybe.

LOL Not in a real life!
The area of parts versus area of the sheet...without considering the part shapes
and how they can somehow be arranged on the page?
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Old 07-31-2018, 02:58 AM
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Dave got in 1st. I was also going to mention part shape vs size of sheet. Area of a part is one thing, but fitting the shapes together on a sheet is another thing.
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Old 07-31-2018, 06:12 AM
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That is why I said, "theoretical minimum number of pages".
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Old 07-31-2018, 10:48 AM
John Wagenseil John Wagenseil is offline
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Quote:
Originally Posted by airdave View Post
Just curious, what is the reason for knowing the area of a part?

So you can accurately estimate how much ink it will take to color the part.
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Old 07-31-2018, 10:54 AM
John Wagenseil John Wagenseil is offline
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Quote:
Originally Posted by Zakopious View Post
Historically, The planimeter was used to measure the area drawn on a steam engine indicator card.

The measurement could then be used to determine the efficiency of the steam engine and indicate potential problems within the steam engine.

If a paper model designer wanted to know the minimum number of pages which would hold the model, the sum of the areas of all of the parts would indicate the theoretical minimum number of pages which could hold the model.
https://www.farmcollector.com/steam-...gine-indicator

Antique tractor operators need them. Years ago, I used to see steam indicators at flea markets and 2nd hand stores fairly frequently, now I have not seen one for awhile.
https://archive.org/details/descriptionofcro00cros
This link goes direct to a PDF of a steam indicator user's manual
https://www.google.com/url?sa=t&rct=...zbWvlcVKuGzMkG
If you can find and build Ed Bertshy's paper stationary steam engine, you will need a steam indicator and planimeter to determine its efficiency and power output.
https://www.youtube.com/watch?v=gdgu4rfjPug

Last edited by John Wagenseil; 07-31-2018 at 11:08 AM.
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Old 07-31-2018, 11:21 AM
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Quote:
Originally Posted by John Wagenseil View Post
So you can accurately estimate how much ink it will take to color the part.
LOL
okay I wont ask anymore
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