Isaac gym gripper position setting

[engrilyasraza51214]

I am working with Isaac gym using Tiago robot. The purpose is to push the object from the table to surface. I have set the position of gripper frame above the table surface but gripper tip always comes in contact of the table surface which makes the pushing action difficult I want to set the gripper tip small above from the table surface like hand should not interact with surface. Can someone suggest the solution for this problem