Delta printers. x/y correction

kileitza

Hi!

Recently I´ve a delta printer with no Z probe

I have no problem with z height and flatness calibration. At first I make it manually and after I've used escher system with good results

However after printing this http://www.thingiverse.com/thing:745523, A tower size is 0.3-0.4 mm smaller than the others

I've changed DELTA_DIAGONAL_CORRECTION_A by up to -2. 

This way A tower print is closer to the target value but B and C tower dimensions are as well incresed so the the difference between towers remain the same!! 0.3-0.4mm....

On the other hand this change affects to flatness. So after this, I changed DELTA_RADIUS_CORRECTION_A and made another print. In this case even the difference in size was a little bigger

Is this normal? Is this the right way for x/y calibration

Many thanks

Iñaki

Repetier

Please use escher 6 var correction with diagonal rod size fixed. The diagonal modifications easily change size when it is optimized in addition so fixing this, make it flat and measure size. Then increase/decrease diagonal if size does not fit and recalibrate for flatness. Have heard this is working very good.

kileitza

I used 6 var correction with diagonal rod size fixed.

The problem came after printing the calibration object. 

A-tower dimension was 0.3-0.4mm smaller than the others (B and C tower dimensions were well)

I tried to correct this by changing DELTA_DIAGONAL_CORRECTION_A by up to -2.

However, althought this corrects A-tower size, it also affects tower B and C dimensions proportionaly making them bigger!.

This does not make sense to me!!

What could be the right way for adjusting X/Y size in firmware?

Thanks!