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Posted by: david downes

01/21/2010, 12:49:20

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hello i'm new to this so please be easy on me. my question, how are surface datums different from axis and center plane datums? any comment is welcome.







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Re: working on cad degree
Re: working on cad degree -- david downes Post Reply Top of thread Forum
Posted by: jem.cadd

01/27/2010, 10:26:05

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a surface datum can be a plane tangent to the cylindrical surface of a shaft or hole. a center plane is usually a midplane between 2 surfaces, such as the opposing sides of a notch. an axis can be considered a line; it has an origin and a vector. 2 axes originating from the same point can define a plane, as well as 2 intersecting planes can define an axis.
as far as your studies go, be sure to learn to think in 3d, understand geometric tolerancing & dimensioning and manufacturing practices as these will affect your strategy in completing an editable solid model.







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Re: working on cad degree
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Posted by: kmintexas

01/25/2010, 06:06:35

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Hi David.
What kind of CAD degree are you going for? I have been doing 3D CAD modeling for about 7 years now. Or longer. Before that it was the old 2D. I can tell you what differs from an axis to a plane in CAD. A work plane is a starting point for a sketch. An axis is the center of an object. Such as a hole. In many 3D CAD programs there is what they call a revolved feature. To make a revolved feature is revolves around a center axis. If you were to take your front, right and top plane, where the centers of these three plane intersect there is an axis. Make a 2D sketch on your front plane and revolve it around the front plane axis. If you wanted to make a shape offset to the origin planes, You can put in another sketch plane, add an axis to the center of the new plane and then make your 2D sketch on that plane and rotate it around your new axis. Does this help you understand planes and axis a little better?







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Posted by: david downes

01/21/2010, 13:04:35

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still looking







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