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HM 1000/1250
squareness first and, if no error is found, the spindle head itself is a problem. If this
is the case, you have no option but to scrape the base side of the spindle head for
the correction.
10.12 Runout on the spindle
1) How to measure
Insert the test bar into the spindle and present
the indicator to the mouth of the test bar, and to
a point 300mm away from the mouth. While
turning the spindle in a low speed, measure the
greatest shaking value.
▪ Tolerance : 0.005mm at the mouth
2) Correction
As the taper side of the spindle is exposed to a high risk of scratch during the precision
work, remove the pull stud from the test bar or a new tool before applying minium or
stamp ink to the taper side, and use the sandpaper to grind the contact area of the taper.
※ Using the grinder is strictly prohibited. If the taper side is badly damaged, re-grind
the spindle itself.
10.13 Movement of spindle in the Z-axis direction
1) How to measure
Insert the test bar into the spindle, insert the
steel ball into the end center of the test bar,
and present the indicator to each of X and Y
highest points. While rotating the spindle,
measure the greatest shaking value. (For a test
bar whose section is already grinned, measure
the runout on the grinding section)
▪ Tolerance: 0.003mm
2) Correction
If the spindle moves in the Z-axis direction, this may be caused by a problem with the
spindle main bearing. If this is the case, replace the bearing.
0.012mm at 300mm away
HM1000ISE99
Rotate
300mm
Rotate
300mm
Mouth
73
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