We have Buehler Minimet 1000 Polisher but we don’t have the user manual for TEM sample preparation attachment, since then we are dealing some troubles while sample preparation.

We are applied following procedure:

1- We are putting the attachment with the ball bearing on top of it and the grinding disc is positioned as shown in 1.jpg

2- Sample is fixed to the glass disc with the wax and class disc is placed into the housing with water droplet on the upper part of the attachment as shown in 2.jpg 

3- Sample height is calibrated until sample touch the abrasive disc.

4- Then operation is started. However, as the sample gets thinner, height is lowered with micrometer and sample move out from the housing even it is 200-300 um thick.

What do you suggest in order to prevent this issue?

Can you describe your procedure?