Easson EX-100, Руководство пользователя

Страница: 31 / 33

30
We can find “S” in the manual, and the normal pitch diameter is 51.329
+0.014
in (M52 1f
T ). The block gauge dimension is calculated:
E=51.329+0.5 1.732+
) 732 . 1 5 . 0 5 . 0 / 8 . 0 329 . 51 ( 8
1
× + −
X
-6.171=46.026 mm
In practice, select and combine block gauges (40 and 6). According to the certificate of
conformity, the correction is -0.5 m for 40mm block gauge, and -0.3 m for 6mm block
gauge. The total correction is:
E=-0.026-0.0005-0.0003=-0.0258 mm
In order to improve the measuring accuracy, the “E” (actual dimension for block gauge)
shall be close to “Eo” (dimension calculated by the software).
Place the block gauge and the measuring block into the block clamper to clamp them
tightly. Note: the bottom spherical surface of the measuring block shall be contacted well
with the location surface of the block clamper. Then put them together with the
workpiece on a plate to let them with the same temperature.
b).Adjustment of the instrument:
Mount the round worktable, internal measuring accessories and thread measuring rob
according to Fig.19. Mount the workpiece and press it tightly with a spring bearer plate.
Move the rob to approach to the workpiece hole. The worktable shall have enough space
for floating. Lock the spindle and the tailstock after their locations are defined.
c).Standard sample calibration:
Remove the workpiece and place the standard sample on the worktable. Make the
measuring accessories insert into the “V”-shaped slot of the standard sample. The
worktable shall have enough space for floating. Otherwise, it is needed to adjust the
workpiece position on the worktable. Turn the micro-active knob for tilting the worktable
to find the reading at “turn-over point”. Then lock the micro-active knob and record the
reading L
1
.
d).Measuring
Remove the standard sample and mount the workpiece and press it tightly with a
spring bearer plate. Note: the worktable shall have enough space for floating. Operate the
worktable and the measuring spindle. Make the measuring accessories enter into the
thread one by one at a interval of 1/2 pitch. Lift the worktable to find the reading at
“turn-over point” and record the reading L
2
. In order to find the shape error, it is better to