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When the radius is less than 35mm, it is fabricated to ball or extra-half ball by testing the ball diameter using the 0.001mm micrometer.
The other radiuses of more than 35mm are respected by Spherometers. BTMT can be able to design and manufacture the test plate both grade A or
grade B according to your requirements. |
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﹞Choose the level of accuracyㄛConfirm the range of radius tolerance.
﹛The radius tolerance of spherical test plateㄗGB1240-76ㄘ |
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Accuracy |
The spherical radius of test plate ㄗ mm ㄘ |
0.5每5 |
>5每10 |
>10每35 |
>35每350 |
>350每1000 |
>1000每40000 |
Tolerance ㄗ ㊣ㄘ |
um |
Spherical radius percent |
A |
0.5 |
1.0 |
2.0 |
0.02 |
0.03 |
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B |
1.0 |
3.0 |
5.0 |
0.03 |
0.05 |
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| ﹞Calculate the sagittal height of radius -h |
h=ㄗR㊣老ㄘ
R 〞 spherical radius
D 〞 diameter of calibrated ring
h 〞 sagittal height
老 〞 radius of ring ball(correction for convex
﹛ ※+§ㄛ correction for concave※-§) |
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| ﹞Calculate the tolerance of sagittal height-忖h |
忖R 〞 spherical radius tolerance |
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