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LAPPING SAMPLES ON THE LOGITECH LP50: USER GUIDE



 

 

Author:

E. Fisher

Reviewer(s):

 


Editor(s):

S. Boehm, S. Frank

Management Approval (Name, Title, Date):

B. Mills (Lab Officer)

Audience:

Technicians

Origination date:

4/30/2013

Current version:

7/30/2018

Revised:

 


Domain:

Thin Section Lab

System:

Logitech LP50

Keywords:

Lapping Samples

...



                                                   Figure                                          Figure 1

5. Remove the scale after the jig has been set.

...



                                         Figure                                  Figure 2

3. Connect vacuum hose, if not already connected.

...

                                      Figure                                         Figure 3

    1. If there is not a proper vacuum seal right away, try pressing lightly on the slides to help them seal and make sure the exhaust flap (Fig. 3) is clean.
    2. If that does not work, take off the slides and clean them and chuck face again.

...

  1. Hold the micrometer with your pinkie and ring finger through the "C" part of the micrometer. Your index finger and thumb will move the dial.
  2. Clean the micrometer before use by placing a piece of paper in between the two bars and closing it gently (do not apply force). Pull the paper out and repeat.
    1. Gently close the micrometer all the way. It should read zero.
  3. To measure the sample, place it in between the two bars and close them gently onto the slide where the sample sits.
    1. Take a measurement at the middle and sides to make sure that the sample is even all the way across.
  4. On the micrometer, each tick mark is 10 um. The difference between the thickness you measure and the thickness of the slide is the thickness of the sample. For an example, if you measure 19 on the micrometer and the slide is 15, that mean the sample is 40 um.
    1. Soft samples should be about 45 to 50 um.
      1. If the sample is too thin, they will either not get a good polish before they reach their target thickness of 30 um, or, they will become too thin.
    2. Medium or hard samples should be about 40 um. This is the majority of samples.
    3. Very hard samples should be about 35 um.
      1. If the sample is too thick, it will take a very long time to polish down to the target thickness.
  5. Write the thickness next to each sample on the sample tray.
  6. If the samples are too thick, put them back on the lapping wheel for a couple more minutes.

Credit

Original version created by Emily Fisher 

4/30/2013

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