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Message ID: 35     Entry time: Wednesday, September 16, 2020, 10:42
Author: Aaron Schmidt 
Status:  
Test:  
Subject: Ball Mill troubleshoot. 

 Odd noises reported. Darwin & Marla. "Like a rock caught in a fan"

AS -  Re-installed bolts to run. Note, balancing feet underneath were uneven. Especially the front right foot was roughly 3/8" out of position. No jars installed.

Ref: Document-42673 - Commissioning Plan - Planetary Mill Pulverisette 5. Use as a guideline. 

Wednesday, September 16, 2020, 10:39: Run @ 50 RPM / 1 min. Operation sounds ok. Balanced. 

Wednesday, September 16, 2020, 10:41: Run @ 100 RPM / 1 min. Operation sounds ok. Balanced & quiet. 

Wednesday, September 16, 2020, 10:43: Run @ 150 RPM / 1 min. Operation sounds ok. Balanced & quiet. 

Wednesday, September 16, 2020, 10:45: Run @ 200 RPM / 1 min. Operation sounds ok. Balanced & quiet. 

Wednesday, September 16, 2020, 10:48: Run @ 250 RPM / 1 min. Operation sounds ok. Balanced, but there is a "hum" that starts around 230 RPM. Disappears around 270 RPM

Wednesday, September 16, 2020, 10:50: Run @ 300 & up to 350 RPM / 1 min. Operation sounds ok. Balanced & quiet. No "hum"  

Wednesday, September 16, 2020, 10:57: Run @ 400 RPM / 1 min (Max RPM). Operation sounds ok. Balanced & quiet. 

Setup Jars w/ safe-lock assembly.

Jar A: 6349 g

Jar B: 6368 g

Wednesday, September 16, 2020, 11:25: Run @ 100 RPM / 1 min. Balanced & quiet. Tighten safe lock.

Wednesday, September 16, 2020, 11:27: Run @ 200 RPM / 1 min. Balanced. Tighten safe lock.

Wednesday, September 16, 2020, 11:33: Run @ 300 RPM / 1 min. Operation sounds ok. Balanced. Tighten safe lock.

Wednesday, September 16, 2020, 11:37: Run @ 400 RPM / 1 min (Max RPM). Balanced. Tighten safe lock.

Wednesday, September 16, 2020, 11:52: Review w/ Darwin & Marla. Operation sounds normal. 

Note* When performing maintenance. Check the balance / feet positions. Confirm there are no loose screws as well. 

Wednesday, September 16, 2020, 14:53: Checked and re-checked with the back panel removed. Note, as the jars were loaded with graphite, a crackling sound did occur. Further testing w/ & w/o. It may be the jars with the loaded materials. Will test with water in the jars. Panel re-installed. Ran again @ 100 & 400 RPM / 1 min (Max RPM). Operation sounds ok. Balanced & quiet. - AS

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