after trying to adjust axis Offset on xy plane i found that Resolution is much too low.
(my machine has x=500 y=250 Offset is around 0.2 degrees)
so Tangens number is 0.003(49) what means i need at least 4 Digits on the right side of comma.
difference from 0.003 to 0.004 means Deviation of 0.5 mm on a length of 500 mm
whats definately too much.
if we would multiply the tangens number by 1000 and handle that value in Firmware instead
of the really small number we could improve that stuff a lot.
i know just changing data type from float to double will not improve anything on
the AVR´s because referring to Arduino IDE it´s handled exactly the same as float.
so what do you think?