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Shaun @ Tru6's Avatar
 
Join Date: Dec 2001
Location: Cambridge, MA
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Math question

I need to get a ball bur to make a rivet set to fit these dome rivets. Head diameter is .324" and height is .067". Metric equivalents are 8.2mm and 1.7mm.

How do find the correct bur head diameter to make this shallow bowl?


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Old 05-08-2017, 09:24 AM
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.452 Dia.
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Old 05-08-2017, 09:32 AM
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If I understand correctly, you need the equivalent spherical diameter.

Old 05-08-2017, 09:33 AM
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thanks! What is the math as I may have to do this for other rivets?
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Old 05-08-2017, 09:40 AM
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The radius of the head is 0.229350746 inches
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Old 05-08-2017, 09:47 AM
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Quote:
Originally Posted by Shaun @ Tru6 View Post
thanks! What is the math as I may have to do this for other rivets?
A google search for a circle from three points. I just put two points on the X axis and the other on the Y
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Old 05-08-2017, 09:49 AM
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Old 05-08-2017, 09:50 AM
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