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You could load a yaml-file with parameters in your launch file: rosparam load

You could load a yaml-file with parameters in your launch file: rosparam load

servo_1: 
  center: 333
  range: 100
  direction: -1
servo_2:
  center: 336
  range: 108
  direction: 1

rosparam load asd.yaml foo

/tmp$ rosparam list 
/foo/servo_1/center
/foo/servo_1/direction
...

You could load a yaml-file with parameters in your launch file: parameters: rosparam load

asd.yaml:

servo_1: 
  center: 333
  range: 100
  direction: -1
servo_2:
  center: 336
  range: 108
  direction: 1

You can load this file in a launch file or on the command line (with added namespace):

rosparam load asd.yaml foo

/tmp$ rosparam list 
/foo/servo_1/center
/foo/servo_1/direction
...

You could load a yaml-file with your parameters: rosparam load

asd.yaml:

servo_1: base_joint_motor: 
  center: 333
  range: 100
  direction: -1
servo_2:
wrist_joint_motor:
  center: 336
  range: 108
  direction: 1

or if you have a list of similar motors:

servos:
  - id: 1
    center: 333
    range: 100
    direction: -1
  - id: 2
    center: 336
    range: 108
    direction: 1

You can load this file in a launch file or on the command line (with added namespace):namespace).

rosparam load asd.yaml foo
// Added @gvdhoorn's proposal with lists /tmp$ rosparam list 
/foo/servo_1/center
/foo/servo_1/direction
...