No. 99MBA091A
3-4
When measuring cylindrical workpieces or screw threads, the numerical aperture affects
measurement accuracy. The appropriate optical aperture is shown as below:
(1)
For cylindrical measurement
Aperture D
=
0.18F
F
;
Focal distance of condenser lens (mm)
=
19.224
(2)
For screw thread measurement
Aperture D
=
19.224
D
:
Corresponds to the aperture setting 1 to 25 indicated on the aperture diaphragm
knob on the control panel of the measuring unit.
d
:
Workpiece diameter
d2
:
Pitch diameter of screw thread
α
:
Screw thread angle
The following graph shows the correlation between the workpiece diameter d and the optimal
aperture setting D. Adjust the aperture diaphragm knob to the optimal position by referring to
this graph.
1
d
3
1
d
3
sin
d
2
3
α
2
Workpiece diameter d (mm)
Aperture D (mm)
Summary of Contents for MF 1010C Series
Page 2: ......
Page 54: ...No 99MBA091A 3 14 MEMO ...
Page 66: ...No 99MBA091A 5 6 MEMO ...
Page 82: ...No 99MBA091A 6 16 c MF 2010C d MF 2017C Unit mm ...
Page 83: ...6 Specifications No 99MBA091A 6 17 e MF 3017C f MF 4020C Unit mm ...
Page 84: ...No 99MBA091A 6 18 6 8 2 Control unit a LED illuminator b Halogen illuminator Unit mm ...
Page 86: ...No 99MBA091A 6 20 d MF 2017C e MF 3017C Unit mm ...
Page 87: ...6 Specifications No 99MBA091A 6 21 f MF 4020C Unit mm ...
Page 88: ...No 99MBA091A 6 22 MEMO ...