What is a compound micrometer - Mitutoyo Measuring Tools & Sensors

To install the rods in a Fowler IP54 digital depth micrometer, follow these steps:

Roll the 0-1 inch rod all the way up into the base of the tool.
Place the base on a flat surface.
Turn the thimble ratchet clockwise until the measurement rod tip is stopped by the flat surface and the ratchet clicks three times.
The sleeve zero line should line up with the zero on the thimble scale If you need more, consult the manual for the device. Fowler Electronic Depth Micrometer Manual - Nicol Scales

Follow the link. How to read an outside micrometer

Generally, micrometers are "zeroed" to a standard -- an object of a known specific length or diameter. If you have placed a 7-inch standard in the micrometer and brought the spindle into proper contact with that standard, and then zeroed the micrometer at that point, it will be properly set to seven inches. Standard micrometer travel is only one inch, and only that range is usually displayed. The user must then add the standard length to the face display or thimble reading to get the "developed" measurement.

This depends on the original specification of the device and upon it's current condition. Mechanical gage calibration deals with this all of the time, when they calibrate these devices against known standard fixed dimension gages. These reference gages also have uncertainty as well. But in general, good quality "thousandths" inch micrometers are typically good within about 1/3 of a thousandth across their entire range. Good quality "tenths" mics in good condition are expected to be within a ten-thousandth across their range. Good luck, Al K

First, you need to make sure that this is the correct size seatpost. There are many different diameters of seatposts and you need to be sure this is the correct size. If you have a set of calipers or a micrometer you can measure the inside diameter of the frame and the outside diameter of the seatpost. if you don't have these tools you can take it to your local bike shop. If you are certain that this is the correct seatpost it may be that you just have some rust on the post that can be taken off with sandpaper or steel wool. Put a little anti sieze compound on the post, slip it into the frame and tighten the bolt. good luck

In order to reset the zero point for your specific micrometer, you will need to have a standard set of pre-set dimensional pin(s). You can check the attached link (page 71 of the Mitotoyo catalog) for the information you need). I guess you could try to find or make a pin with the same dimensions as those noted on the catalog page, but if you're using this in a manufacturing setting, you might have no choice but to purchase a set of gauges for calibrating your micrometer.

The only other option is to contact the manufacturer for an alternative method, but I doubt they'll be able to provide any alternative, as precision setting of the zero point is required for accurate readings with this specialty micrometer.
http://www.mitutoyo.co.jp/eng/products/micrometer/Micrometer_2.pdf

You will need the following....
Dial indicator
Gear marking compound and a clean brush
Calipers or a micrometer
Bearing pullers
Bearing press
Three foot long breaker bar or strong impact gun
Pinion nut socket
Ring gear bolt socket
Carrier cap bolt socket
Six point cross pin bolt wrench
Brake line wrench
Pry bars for removing the carrier case
24 oz ball pein hammer
48 oz sledge hammer
48 oz plastic dead blow hammer
Assorted brass punches
Punch for marking carrier caps
Oil drain pan
Foot pounds torque wrench
Inch pounds torque wrench
That should get it apart and back togather.
If you still want to do it...go to premium and i'll walk you through it...

Micrometers must be calibrated at 4 spots around the barrel and at zero and full scale to be truly accurate. You will have to send it to a calibration lab or back to Starrett for a full calibration because they will check it with gauge blocks of known length and verify the spindle and anvil surface flatness.

If you are only concerned with the zero and not as much about the full accuracy of the tool, then you can reset the zero yourself. With the mic fully closed (spindle and anvil touching), turn the barrel with the funky, half circle shaped wrench that came with the mic in the box. There is a little hole in the barrel where the nub on the wrench will fit then you just turn it until it reads zero. Good luck.

spray some silicone into the thread areaand open and close it a few times.

No...
that type of hand tool is to be used on items that are idle.

Serious injury and product damage can occur if an attempt is made to clamp this tool on to a moving part.

It would seem that a dial indicator might be the tool of choice for you.

Good luck