Primary Flare or Primary Taper

UT tolerance （ø0.3mm）: 0.0045mm or less

Hole Qualities

If they are symmetrical, there is no serious effect on registration accuracy.

Primary Flare or Primary Taper

1.Adjust drill position and cross hairlines

Primary Flare :
Reposition the drill bit slightly to the left of the cross hairline.
Adjust cross hairline after grinding.

Primary Taper :
Reposition the drill bit slightly to the right of the cross hairline.
Adjust cross hairline after grinding.

2.Adjust the magnification of microscope to recognize drill position well.

3.Tighten fixture screws not to move the cross hairline.

Tighten the microscope height adjust screw
Tighten the microscope lens screw
Reduce the amount of shock absorber extension.

4.Adjust the universal joint (Correcting runout)