Problem with steering drive

[carballo2109]

Hi, I'm riding a car with lego and I've put a steering system, exactly this: http://www.nxtprograms.com/steering_rover/steps.html 

But when it comes to control the motor does not rotate correctly, sometimes turns too and other falls short, I do it as follows: 

motorA.turn (100, 30) 

time.sleep (1) 

motorA.turn (-100, 30) 

And do not understand why does not behave as expected. 

Help please. 

I apologize if it is not well understood the text, I'm using google translator because my English is very bad. 

Greetings, thanks.

[John Brohan]

use gears make the motor rotate many revolutions to drive the steering.
John

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[carballo2109]

Okay, thanks, but in the end I got correct motor rotation using get_tacho() and tacho_count, but if I should use gears. 

Greetings, thanks.