How to change the co-ordinates of the velodyne point cloud data?

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Hi,

I have three velodynes and I launch all the three using group. I get the point cloud but all of them have the same fixed frame as 'velodyne' and when I visualize it in rviz, all the point clouds have the same origin.

I tried using tf package

<node pkg="tf" type="static_transform_publisher" name="HDL_1_base_link" args="5 0 0 0 0 0 /velodyne /HDL_1/velodyne_points 100"/> 


<node pkg="tf" type="static_transform_publisher" name="HDL_2_base_link" args="-5 0 0 0 0 0 /velodyne /HDL_2/velodyne_points 100"/>

but ony the axis change but not the point clouds.

Can please tell me what I doing wrong and suggest a solution?

Thanks in advance