You can use a Glue constraint to bond rigid bodies contained within a rigid set. When rigid bodies are glued together, they appear as a single piece of geometry that can be broken apart, given an amount of input force, specified in the Glue Breaking Threshold setting.
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Note:
The Glue constraint is only used with Rigid Sets.
Objects must be touching for the glue settings to work. The glue constraint calculates which points of the rigid body are touching and applies the constraint automatically. (You can view these points if you activate the Contact Points setting.
If your objects are touching or intersecting, set the Collision Shape Margin slider to 0 so they do not automatically collide at the start of the solve.
Freeze scaling before you create a Bullet Rigid Set. Scale transform values are not correctly transferred to the resulting solved object .