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Place closed grinding jar horizontally in the clamps with the pin in open position. Verify the pin is in closed position (Figure 13) and tighten the clamps by turning the handle until the jar is securely tighten (hand tight is good). Close lid and select desired program to run.
Figure 13. Retsch jar clamp
Starting the Mill
After the grinding jars are secured in the clamps, the pin is in the closed position and the clear cover is closed it is time to select grinding settings (Figure 1913). Close lid and select desired program to run.
Figure 13. Retsch jar clamp
Starting the Mill
). Press "PROG" to go through the list of programs already created (Figure 14, arrow A). Program 1 (A) is currently set for 12 min at 25 1/s. This setting is good for clay rich material. Softer sediments such as CaCO3 CaCO3 typically need less time. It is important to only grind soft sediments in the agate jars and hard material should be ground in the shatter box (see XRD Sample Preparation Hard Rock). Press "START" to start a program (Figure 14, arrow D). After grinding cycle has completed turn knob counter clockwise and pull pin up and into its open position (Figure 19A13). Unscrew clamp and open jar to verify grind size. If sediment is still too coarse regrind.
Figure 1814. A. Preset programs. B. The shaker frequency. C. The time grinder is set for. D. The start and stop.
To create a program, press "PROG" and choose a program number (you can create up to 9 different programs) (Figure 14, arrow A). When ready, press "SET" (Figure 14, arrow A), and numbers on screen start flashing. Select a frequency (Figure 14, arrow B) and a time (Figure 14, arrow C) by pressing "-" or "+". Press "SET" to save your program, flashing stops. Then press "START" to run the program just created (Figure 14, arrow D).
Transferring Powder
After grinding is complete remove grinding jar from clamps. Rotate black screw counter clockwise a quarter turn , rotate clamp counterclockwise and pull the pin up into the open position (Figure 1713). When the pin is in the open position, unscrew the black knob until grinding gar jar is loose enough to remove . Unscrew grinding jar, poor from clamps. Pour powder onto weigh paper or directly into clean and labeled sample bag or sample vial.
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