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Ductile cast iron is a great choice! It’s often the best choice for open kiln drive gears, which are hot and dirty. Hard, thin coatings are available via Eutectic and others, which will probably further reduce wear rates. Sprayed graphite or Molybdenum Disulphite lubricants will obviously...

There are good, inexpensive canister-type oil filters readily available for removing particulates (and water) from oil. General concepts to design into your systems: High viscosity oils require more filters, operated in parallel to get adequate flow. Filter manufacturers often design for...

Bolt stretch will help equalize the loading on the 12 fasteners (longer studs are better than shorter). Evenly increasing the torque during assembly, in a cross-star pattern, in steps of approximately 20% of maximum torque, will help prevent cocking and binding. From practical experience...

Safety Note: People have fallen through older industrial roofs, with no warning, and horrible results (death, paralysis, lawsuits). Two causes have been: 1) corrosive atmospheres below the roof deck – slightly acidic vapors – that condense onto the cool roof deck during cold periods – causing...

Glad everything worked out, and thanks for all the info. The manufacturer's specs (1/1000" per inch and 220 weight oil) work well if your journals are in good condition. I guess I assumed your mill was old and possibly in rough condition, as many are. With bad journals (out of mfg spec)...

Sorry for the late reply - just became a member. 80% is the number commonly used. It has to be in the right locations however, to maintain the oil wedge effect.

The previously mentioned web-site is a good one, but it’s focused primarily on normal high speed journal bearings, using relatively light oil. The thick oil you need at slow speeds is not allowed in the calculator. Your lift will only be a few thousands of an inch, approximately 0.002” to...

EnglishMuffin is correct! You definitely have gear problems that will create a lot of trash metal in your lube oil, possibly damaging other bearings & gears. You should pull oil samples on a regular basis and filter the oil to somewhere between 2 and 10 micron depending on your oil. Or you...

Just became a member. Sorry to be so late in responding to your question. I’ve worked with girth gear problems in many plants, on various rotary kilns & ball mills (up to 5000 hp). The previous responders are spot on regarding the cause of pitting. There are some additional methods for...

Liquid ring vacuum pumps are commonly driven with v-belts from electric motors. The diesel engine may need a drive shaft designed to support the side loads caused by the v-belts. Both are straight-forward power transmission methods. If you need more information, call me at 641-423-9363 with...