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Have ever wanted to mate parts together based on different unit systems but found that even though they pass your tolerance standards they don’t mate together well? SolidWorks assembly mates are based on absolutes and if features on your supplier parts don’t match exactly, mating them may be a challenge. Here is one simple technique for mating those parts that may help solve some mating issues.
In this example we will be mating a part based in inches with another part based in millimeters. What is important here with these two similar parts is that their holes line up. Because their holes are slightly off, mating the holes concentrically would cause mate errors.
The technique here is to add a sketch to each part file. The sketch has two construction lines, one vertical and one horizontal, the vertical having the midpoint relation added with the midpoint of the horizontal line and the end points of the horizontal coincident with the centers of the holes. The sketches on the parts should be on the mating faces.
You may then mate the sketch vertical lines coincident to each other and the horizontal lines coincident to each other. You will see that the holes line up in tolerance even though they are not absolute, which would be needed if they where mated concentrically. See the last image.
The final mated part with outlines to show the alignment.
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