I am doing a beginner Blender tutorial I found here: http://gryllus.net/Blender/PDFTutorials/TheRocketSteamLocomotiveModeling.pdf
At the beginning of the tutorial, I am having trouble getting the connecting rod to have two constraints. One is a child constraint of the crank pin and the other is a locked track constraint to the linking pin. (The linking pin is a child to the piston rod.) Both constraints will work separately, but when I try to use them both, only the child to the crank pin constraint works. Does anyone know how I can get both constraints to work? I included three images below that will hopefully help illustrate my problem.