Hi thanks for all your help. I've looked a bit more into setAxisScaleDiv but It takes a QwtScaleDiv object and I don't want that of a finer control over ticks since they're all evenly spaced, I just want to set a step for major ticks and another for medium ticks (I need to show a grid of squares of 1x1mm contained in bigger squares of 5x5mm). If there is no other option I'll calculate all the ticks by hand.