well.... first of all you gotta filter the reading, and I don't really know which method you prefer...

Secondly... the ADXL330 should have a form on how to convert volts to radial speed....

Supposing you get the 10bit convention the max value you get is 1023...

Now.... Let's say that you use the 5V volt reference....

Then we have a formula that is 5 / 1023 = x

Suppose you multiply the readings with this x factor you get the volts at the ADC channel...

Then use the ADXL330 formula to convert to speed...

Same with the accelerometer....

But keep in mind you gotta filter the data with a method cause cause of vibrations

on any axis, should you have problem, especially with the accelerometer....

Gyros aren't so prone to noise, but can be affected....

Also, applications using such data are control applications.... Keep in mind making a

smart algo for the filtering.... And plan the best case and worst case scenario timing...

for not having any problems,

Suppose your code is smart enough add this as a parameter....

Best Regards,

Lefteris, Greece