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Join Date: Aug 2011
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Ball Mill Girth Gear and Pinion Alignment

08/25/2011 4:15 PM

Can someone explain how to perform a pinion & girth gear alignment?

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Engineering Fields - Piping Design Engineering - New Member Engineering Fields - Mechanical Engineering - New Member

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#1

Re: Ball Mill Girth Gear and Pinion Alignment

08/26/2011 3:07 AM

With all due respect, the way to perform this type of alignment is to bring in an expert. If you must ask, you should not be doing this work. Even experts don't always get this right. High vibration, broken teeth and forced shutdowns are likely consequences.

I assume that you've also been entrusted with the initial shell and heads/trunnions assembly of the mill too, correct? Be prepared for the mill to start throwing bolts or to be leaking slurry from the flanges since I infer that the knowledge required to avoid these problems is also quite limited.

Good luck

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#3
In reply to #1

Re: Ball Mill Girth Gear and Pinion Alignment

08/26/2011 5:37 AM

@ Talha Abu :

You might find the following link to be informative. I provide it so that you can put the importance of the intial alignment into perspective. The final bolt-up of the Girth Gear (once run-outs have been checked - twice, hopefully!) is only one critical step of a very important process. Please engage somebody who is qualified to help you at site if availability of this mill is important to you or to your employer/client. Paying close attention to how the work is done will help you to eventually be able to manage similar tasks.

Link: SAG Mill Girth Gear Failure Averted

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Guru
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#2

Re: Ball Mill Girth Gear and Pinion Alignment

08/26/2011 5:30 AM

Having seen the aftermath of a ball mill shearing a pinion tooth I'll echo HeviiGuy's advise. Get some one in to do the alignment, you'll have some recourse for damages if nothing else.

As to the damage when our pinion tooth sheared:

  • Pinion pedestals ripped out of the foundations
  • Drive shaft bent
  • Reduction gear box foundations loosened
  • Several thrown winding from the motor rotor

All in all an expensive time!

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Anonymous Poster #1
#4

Re: Ball Mill Girth Gear and Pinion Alignment

08/27/2011 2:07 AM

pinion alighnment is done by coating the pinion with a lead based grease. after rotating the drum, the grease marks will show the contact area. the pinion should contact the girth "ring" near the center of the gears.

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Guru
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#5
In reply to #4

Re: Ball Mill Girth Gear and Pinion Alignment

08/28/2011 5:04 AM

Engineer's blue is better.

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