Metric micrometers are tools used to make highly accurate measurements, usually of things that are difficult to measure to begin with. In this case, there are two basic types of metric micrometers.
The screw gauge uses precisely machined screw threads on a shaft, or spindle, which is advanced and retracted to make a measurement. Calipers are designed to slide open and closed to take a measurement. Accuracies vary depending on the type of metric micrometers and scales being used.
If the type of metric micrometers that you have is screw gauge, to use it, first of all, retract the spindle by turning the handle until the micrometer is open slightly more than is necessary for the measurement. For an outside micrometer, the opening is slightly larger than the object being measured, but for an inside micrometer, the arms are close enough together that they fit inside the object being measured.
Secondly, turn the handle until the metric micrometers are just grasping the object. Do not overtighten. Then, use the micrometer’s locking mechanism to hold the measurement in place. This could be a small lever or a thumb wheel located on either end of the handle. Finally, read the measurement from the micrometer’s fixed scale and from the Vernier scale. Combine the two readings to get the total measurement.
Meanwhile, if the type of metric micrometers that you have is calipers, to use it, you should open first the calipers slightly more than necessary to measure the object. Secondly, close the calipers onto the object being measured. If your calipers have an additional thumb wheel to fine-tune the measurement, use it until the object is just being held by the calipers. Do not overtighten.
Thirdly, lock the metric micrometers in place using the locking mechanism, which may be either a thumb wheel or thumb lever. Finally, read the measurements from the fixed and Vernier scales and combine them to get the total measurement.
One of metric micrometers you can choose in the market is Starrett 436.1MRL-50 25-50mm Metric Outside Micrometer with 0.01mm Graduations. This is the jewel of precision micrometers used by skilled workmen worldwide. The spindle and anvil are sized at .235″ (6mm) to reach places most micrometers cannot reach.
Headquartered in Athol, MA, in the heart of New England, where manufacturing began and evolved into what it is today, Starrett as a brand of metric micrometers has a history and reputation that are so rich and solid that the words quality and Starrett are virtually synonymous. That is why, you do not need to worry that you will regret because of purchasing this metric micrometer.
Another option of metric micrometers is Mitutoyo Micron” Outside Micrometer Inch/Metric-406 Series-RANGE: 0-1″. This metric micrometer features non-rotating spindle to eliminate torque on workplace, carbide-tipped measuring faces, and spindle diameter 406 series: 0. 25″ (6. 35 mm). The 406 series can be linked to the SPC system digimatic functions, same as the digimatic outside micrometers series 293.
Of course, those metric micrometers mentioned above are not the only options you can choose out there. With many options available for you, there will be always the right one to fit in your needs and budget.
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