Base part is moving when I drag other components in mechanism assembly

[teedit]

My base part is moving when I drag other components in mechanism assembly. I have assembled with pin joints. When I drag components the base part is moving as well. I have constrained the base part with default constraints. Any help with this?

 

[looslib]

Have you grounded the base part?

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli