Currently I am using the ADXL345 chip.
That are listed in the document AN-1077. This method of calibration is briefly shown.(AN-1077)
but, It does not understand. Read me with more documents and sources available?
There is a section on "offset calibration" in the datasheet as well. What are you looking for specifically, can you post a few questions.
Maybe these links could help:
This circuit note might be helpful as well:
Retrieving data ...