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Calculating Perpendicularity

Calculating Perpendicularity

Calculating Perpendicularity

(OP)
I am using a laser tracker which will not automatically calculate perpendicularity as a cmm would.  I can calculate an angle between two planes for instance, but do not know what equation I would need to use to calculate the error of the angle as an amount in thousands of an inch.  

I need to know the math behind calculating perpendicularity between two surfaces.

Thanks

RE: Calculating Perpendicularity

I agree with Kanat as long as the perpendicularity is not shown in GD&T. In that case, it combines angle and flatness (could be straightness) of the surface and trig won't help.

Dave D.
www.qmsi.ca

RE: Calculating Perpendicularity

-take two points on each of two perpendicular faces. Using the coordinates of the two points you can calculate the slope of the two lines.
-By taking tangent-inverse of the slopes you will get the angle.
-Then you can calculate the difference between the two angles and see if they are perpendicular.

RE: Calculating Perpendicularity

Take perfect spherical surface like a ping pong ball divide it exactly in two and fixture the edge of one of the spherical segments perfectly perpendicular to a slab surface. Now measure the perpendicularity of the inner spherical surface to the slab surface.

What is its value?
How would you measure that using a laser tracker?

Paul  

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