if the slot is not slot but a cutout then You will not have the slot path and therefore You can not use it for path relation or axial alignment
YOu can create a sketch there and us this one
thanks but the slot was created using a sketch, can i not use that to mate?
or show some sort of temporary axis.
i tried to use show/ hide to show sketches but they are not visible
You should be able to show the sketch for the slot and use it. If you want to be able to "slide" the hole in the slot, you can create a line in the middle of the slot and use the connect constraint. If you want to just center the hole in the slot, add a circle to the sketch for the slot and use it.
Before using the slot command, we frequently made slots with the normal cutout command, and the symmetric offset command. This didn't leave a separate sketch to be shown in the assembly. So, we would add a construction surface in the slot that could be shown, and then used for assembly relationships.
a couple options you can do
1. If you are looking to add a relationship to grab only the center point of the slot. Temp axis at the center point basically. you can go in and do another cut. Cut a small circle that is only a few .002 of an inch beyond the outer edge of the slot. This will then give you an axis to align to. I have done that for square cut outs when installing carriage bolts.
2. in the part file where the cutout is in you can sketch a slot path. Then in the assembly turn on that sketch and apply the Path relationship to it.