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Hi, 

A user parameter appears in the parameters tab in the part or assembly. This parameter can be introduced in equations between the dimensions of the part for example. In one part it would be very useful to generate parts of catalog, where one would place the values ​​of the parameters to vary in this catalog of a reducer or a motor for example. Then create an ipart or an equation with another parameter to size the part correctly in the desired configuration.
In an assembly, a user parameter could be used to place general data that controls constraints between parts or subassemblies.
The iproperties instead are numbers or text, and serve for drawing notes for example. An iproperty can not be multiplied by another, nor can an equation that of a result. Note how easy it is to retrieve a value of iproperty in a drawing note, while a dimension value is more complex and often does not focus correctly when changing parts.
User parameters are not exported by default as iproperties. For that you have to check the box that shows the image below.

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In the user parameter it can be controlled if the unit will be seen when exporting it as iproperty, its tolerance can be controlled, and much more.
I think the most advisable thing is to work with equations with the parameters and then export them as iproperties.
Also imagine that it has as I said a catalog part. With a lot of dimensions named with letters like its catalog. Imagine that you must delete a sketch to improve your file. The dimensions of this sketch will be removed, and the user parameters will not. If I had named the dimensions with these special names, I would have had serious problems.
I hope I was clear. regards


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I am attaching my Upwork profile for specific queries.

Sergio Daniel Suarez
Mechanical Designer

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