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June 7th, 2018, 01:02 AM   #1
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Constant angle protractor?

Is there a protractor/compass that keeps a constant angle where one arm automatically moves the other arm?

Say the protractor is closed at a 0 degree angle, you move one arm and the arm follows exactly opposite to it on the other side?

Protractor.jpg
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June 7th, 2018, 01:35 AM   #2
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I doubt it.
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June 7th, 2018, 02:00 AM   #3
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Mmm, there must be something like this, if not a geometry tool
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June 7th, 2018, 03:49 AM   #4
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Various adjustable linkages exist, so perhaps there's one that would do what you want if set up correctly.
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June 7th, 2018, 06:42 AM   #5
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You want one of these:
https://image.dhgate.com/0x0/f2/albu...PYXpbhA857.jpg
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June 7th, 2018, 06:49 AM   #6
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If you attach a piece of cork to the end and point a laser distance measuring device at it, you can read off the angle
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June 7th, 2018, 06:58 AM   #7
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Quote:
Originally Posted by stoob View Post
Is there a protractor/compass that keeps a constant angle where one arm automatically moves the other arm?

Say the protractor is closed at a 0 degree angle, you move one arm and the arm follows exactly opposite to it on the other side?

Attachment 9755
Yes, of course, carpenters use them and I believe Stanley tools make one.
The simplest ones are just two arms like you show with a large locking wingnut at the pivot so you can set the angle.

Equally my adjustable draughtsman's square has this ability.
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June 7th, 2018, 09:46 AM   #8
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What causes the arms to move in opposite directions?
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June 7th, 2018, 11:31 AM   #9
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Build one and patent it, then see how well it does.
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