How do you use planes when creating parts?

When creating extrudes and lofts and such, which planes do you like to use as a reference and why?

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Well, I always like to use the origin work planes for start with the first sketch, It can help you a lot for do mirrors if the part is symmetric (You need to define your sketch centered with the origin). You wont need to do new workplanes for mirrors and this planes can not be deleted or undefined so it's a good plus for don't have Inconsistencies or alerts.

 
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Planes are mostly just for having a place for the sketch, although you can extrude to a plane. I also use planes for a flat "cut with surface" or a flat "split" as these commands can use a plane as the cutting surface and it's quicker to create a plane than it is a surface.

I've found the quickest way to create a plane if there is no suitable geometry to select is to make a sketch as opposed to making an axis or point, this is mostly true with a plane that is not perpendicular to the base planes.

One thing you can do to stay organized is for all the planes that are created offset from the base planes is to drag them up the tree to right under the base planes and change their names to the distance they are offset from the base planes. Then you can put them all in one folder.

 
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First I must agree with Tomica about naming planes when creating them such as midplane, drive plane, cut plane etc. I would go even farther and say extend that to all the features and sketches you create as well. Parts with many features can become ungainly when all you see is a long list of extrudes, cuts, and revolves. Naming features on creation is a good habit to employ as well as getting in the habit of extruding midplane which will save you time often.
I like to design machine parts by taking the stock from which they will be cut and name it by its size as stock then make cuts form there, which helps see if there are machinability problems. Many a young engineer has designed a part but then found out a machine shop can't make it.
naming sketches, features and planes also helps convey design intent, so if you look at the part years later or you upload to grabcad and someone else want to understand your intent it results in better understanding.
Remember also every face of a model, no matter how small is a plane to sketch on too.

 
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