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The Lubrication Reliability Source™

World Class Lubrication Reliability for the Mining Industry

Gearing Inspection February 2015

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Ball Mill Inspection Overview

The following report provides a brief overview of the Ball mill inspection conducted on 18th February 2015

The gearing terminology is based on the AGMA 1010-E95 standard, “Appearance of Gear Teeth”

Pinion tooth measurements were recorded on both pinions. It should be noted that these measurements have low reproducibility and are for “general reference” only.

Included in the report is information on the various adjustments and improvements carried out while onsite.

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Pinion # 1 with LE9011 Excellent clear “wet” lubricant film

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Pinion # 1 Close up of previous contact pattern – DE # 1 pinion tooth

February15 – Note contact areas &pit mark unchanged compared to last inspection.

March14 – This mark is a contact patterntransferred from the girth gearing, with small pit mark on the pitch line.

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Pinion # 1 Close up of previous wear pattern –NDE # 1 pinion tooth

March14 – Indentation on pinion and someminor third party abrasive wear causedby entrained contaminants.

Feb15 – No increase in size or severity of Indentation or abrasive wear.

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Girth Gear with LE9011 Note original machining marks visible on wet lubricated teeth

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Girth Gear Inspection in March 2014

March14 – Scoring and adhesive wear plusminor third party abrasive wear caused byentrained contaminants.

February15 – No major change in size or severity of wear pattern.

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Girth Gear Note slurry visible in roots and shroud

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Ball Mill Inspection Pinion measurements

Measurements taken on both pinions 100mm and 200mm from the discharge side in 5 locations at depths of 10mm.

Tooth Ambient Temp # 1 26.3 C

Tooth Ambient Temp # 2 31 C

Pinion # 1 100mm 200mm Pinion # 2 100mm 200mm

10mm 23.7mm 24.4mm 10mm 29.0mm 28.5mm

20mm 34.8mm 34.6mm 20mm 38.0mm 39.0mm

30mm 43.1mm 43.4mm 30mm 46.0mm 43.3mm

40mm 50.0mm 49.1mm 40mm 52.1mm 53.1mm

50mm 55.2mm 55.8mm 50mm 57.0mm 57.2mm

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Ball Mill Inspection Spray pattern adjustment conducted by Lubrication Engineers

Note spray pattern prior to adjustment shows parts of the girth gear not receiving coverage, following adjustment there is complete gear coverage.

Before spray nozzle adjustment

After spray nozzle adjustment

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Ball Mill Inspection Spray Nozzle Adjustment

Before spray nozzle adjustment

After spray nozzle adjustment

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Ball Mill Inspection Pinion #1 Inspection door

Note gap where incorrect hinges have been welded onto

door leaving void for dirt ingress. Urgent attention

required!

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Ball Mill Inspection LE fitted special PTFE seal tape to inspection doors.

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Ball Mill Inspection Pinion #2 Inspection Door

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SummaryBall Mill Inspection

Lubricant film is excellent on both pinions and girth gearing Previously observed tooth wear is stable Mild slurry ingress is observed in the roots of the girth gear Pinion tooth baseline measurements were recorded Spray nozzles were re-aligned to provide correct spray pattern Pinion # 1 inspection cover has been refitted in the incorrect location Special PTFE sealing tape was applied to pinion # 2 inspection covers

Recommendations Continue to monitor the pinion temperatures weekly Visually inspect both pinions with a strobe light weekly Urgently refit pinion # 1 inspection door and reseal Report completed by Rodney Fitzpatrick (rodney@lubeng.com.au)