OpenHackSpace

Change Depth Mic Rod

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Depth micrometers (mic) often times have the ability to measure between 0″ – 6″ as seen in this photo above I am measuring a die with the aide of a 123 Block. The mic in this case is showing a measurement of .163 which means the die itself is 1.000 – .163 = .837. The math is simple. The question becomes how does one measure depths greater than 1.000 at this point. That is easy. I will walk you through changing the rods in a depth mic.

In order to do this you will need the small spanner wrench that came with your depth mic.

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You will see a small hole in the top of your depth mic. This is where you will put the tip of the spanner wrench.

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Turning the top counter clockwise you will find that it comes right off. It is important to note that you do this in a clean environment in order to prevent debris from getting into the fine threads.

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The rod assembly will pull out with no issues at this point.

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Now place the new rod back into the depth mic.

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Now place the head of the depth mic back on and tighten it with the spanner wrench. It is important to note that you don’t over tighten the head. I am able to tighten it using one finger as shown in the photo.

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At this point I am ready to measure the die again.

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You can see that I am using the 2.000 side of the 123 Block now as the measuring base where as before I was using the 1.000 side. I now obtain a measurement of 1.161. I know this because I inserted the 2.000 rod into my depth mic which gives me the 1.000 portion. Followed by the measurement of .161 from the mic itself. This gives me 1.000 + .161 = 1.161, which in return means the die is .839 tall on this side. This was found by taking 2.000 – 1.161 = .839. As you can see changing rods doesn’t affect the accuracy of a depth mic.