5 axis tilted drilling

iI allready create several configurations in 2.7 and 2.9 versions .The resault is always the same:If the axis named C it want work
If the axis named A works perfekt(exakly the same config)

Really not sure what is going on.
Just as a work around you could try to add an A axis and increase the number of joints to 7 in the ini file and see if that gets the C axis going. 

Also to keep things simple until you get the C axis running you might want to change back to trivial kinematics.

so in your ini file, instead of
KINEMATICS = 5axiskins coordinates=xyzcbw

revert back to

KINEMATICS = trivkins

I assume you have tried jogging the C axis with the '+' and '-' in the axis gui. Or are you trying to jog with the keyboard only?

edit:
Also, have you tried if the C axis works in MDI command?

check_config: (trivkins kinematics) ERROR:
[JOINT_3]MIN_LIMIT > [AXIS_A]MIN_LIMIT (-9999.01 > -1e99)
[JOINT_3]MAX_LIMIT < [AXIS_A]MAX_LIMIT (9999.01 < +1e99)
[JOINT_5]MIN_LIMIT > [AXIS_C]MIN_LIMIT (-10 > -9999.01)
[JOINT_5]MAX_LIMIT < [AXIS_C]MAX_LIMIT (20 < 9999.01)

You have your AXIS limits set larger than your JOINT limits. Try setting equal limits for axis and joints 

Ok maybe try the attached files. I have fixed some stuff in your hal and omitted the a-axis there since we only want that in the ini to test things.