I have not had much experience with setup as it is a mine field........ but I have located some information (see attached).
The common areas for setup include references from the gun data sheets (speed/pressure/distance) are:
- Setting the Mechanical Parameters (Motion limits, Direction, Speed, Encoder Resolution)
- Setting the Servo Gun Data (Clearance distances for fixed/moving tip, clamp forces - max/min, Tool Z direction).
- Force Calibration
- Force Compensation
- Deflection Measurement
- Tip Wear Measurement
Most setup data, can usually be found in the gun data sheets, but you will have to look for them/calculate them.........
The main area is correct setting of the Mechanical Parameters.
The other areas are more of a 'fine tuning' in my opinion to make sure the correct forces/clearances are applied (force meter required).
Mechanical Parameters are in Aux 1011
- Set the max/min motion limits
- Travel direction
- Speed of gun
- Encoder resolution, you have to calculate the correct resolution for the encoder, to ensure stroke distance is actual distance.
- This will then allow correct pressures to be set more accurately etc.....
The formula used is:
Resolution=Distance of tip travel for one rotation of motor/8192
So lets say the manufacturer data sheet says distance of tip travel = 11.53mm, the resolution would be:
- 11.53/8192 = 0.001407470703125
- Apply the resolution exponent 3................
- Resolution = 1.407470
Once the mechanical parameters are set, you can then set forces and servo gun data for usage.
Not much to go on, but that's the limit of what I have.......Hope it helps.
You need to use an electrode force meter, with load cell to obtain force readings.
(Obara had one but I cannot find any further information on it.......Model was IFM-10)
Attach load cell electrode to fixed tip of servo weld gun.
- Aux 1023 is Force Calibration.
- You then operate Gun, measure force and do current calculation.
- This allows robot to set current to servo motor for correct force requirement for weld.
I think force calibration etc is detailed in Servo Gun Instruction Manual
No idea really, I'd be surprised if Obara (I've never dealt with them) get that involved with the robots as they are just a supplier of the Servo Gun - worth asking if you can contact a rep for data sheets........... 
- I think they can provide the initial setup data for max electrode force, stroke distances, speeds, deflection distance/force applied etc.
- But I think from a calibration perspective, this would have to be on the robot itself because the forces will be different depending on the posture of the servo gun, speed/direction of the moving tip during the weld.
- No harm in throwing some values in there as long as you don't exceed the max current of the servo gun motor I suppose...... 
I didn't set up our servo guns, which are Denyo guns, so I don't know if this will help. The material we weld is 1 to 3mm total thickness and our typical clamp force for spot welding is 1 to 3 kn. On our guns, 5kn is enough to force the cap tips all the way against the electrode body. Don't ask how I know this!
We use a TUFFALOY digital force gauge and an ENTRON weld force tester to verify our weld gun settings.
