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Thread: Circle calculation
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25th Sep 2018, 11:11 PM #16Senior Member
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I agree with elanjacobs - solidworks puts out a diameter of 2.27mm
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25th Sep 2018, 11:18 PM #17Gear expert in training
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25th Sep 2018, 11:19 PM #18Senior Member
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"I agree with elanjacobs…"
+1
I missed by a poofteenth, two or 3 times....!
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25th Sep 2018, 11:36 PM #19Senior Member
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25th Sep 2018, 11:43 PM #20Senior Member
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25th Sep 2018, 11:47 PM #21Gear expert in training
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26th Sep 2018, 12:10 AM #22Senior Member
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26th Sep 2018, 12:22 AM #23Gear expert in training
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Yeah, trial and error in decreasing increments until you get near enough.
I'll try to remember to ask the CAD wizards at work, there must be a formula or geometric construction to do it but I can't figure out how.
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26th Sep 2018, 12:24 AM #24Golden Member
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There is a right angled triangle with hypotenuse D, base 2mm (half the thread pitch) and height is D-1.2. Using pythagoras you get
D^2 = (D-1.2)^2 + 2^2
expanded
D^2 = D^2 - 2.4D + 1.44 + 4
simplified
2.4D = 5.44
D= 2.2666666666666666.......
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26th Sep 2018, 01:09 AM #25Gear expert in training
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26th Sep 2018, 01:24 AM #26Senior Member
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I reversed the triangle to the opposing circle tangents and it fits but can't use it to work out the circle sizes. Not that I can see anyway. Picked a curly one didn't I ?
Green triangle Base 4, height 1.2
Circles.jpg
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26th Sep 2018, 01:49 AM #27Golden Member
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Actually, you don't understand what happened there. Consider what D - 1.2 represents. It is actually the vertical distance between the centres of the circles that form the top and bottom threads. This is a mathematically correct solution for calculating the diameter of the circles. Trust me I actually do have a maths degree.
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26th Sep 2018, 08:24 AM #28Senior Member
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How did you calculate it ?
Easy!
After 5 beers I used 1.2 as the circle centres.
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26th Sep 2018, 09:02 AM #29Golden Member
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26th Sep 2018, 09:15 AM #30Most Valued Member
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