Artec Machine News

23 Apr '20 Calculated Scuffing Risk: Correlating AGMA 925-A03, AGMA 6011-J14 and Original MAAG Gear Predictions

John Amendola, John Amendola III, and Robert Errichello

This paper relates specifically to gears that are finish ground and considered high speed per ANSI/AGMA 6011; meshing elements with PLVs (pitch line velocities) in excess of 35 m/s or rotational speeds greater than 4,500 rpm (Ref. 1). Current application standards by AGMA & ISO both provide methods for rating gears for macropitting and bending fatigue. However, neither have a standard to calculate scuffing risk. Both have provided documents; AGMA 925-A03 and ISO/TS 6336-20 (formally ISO/TR 13989-1) as informative suggestions to consider scuffing risk in gear design. Nevertheless, scuffing requires the same consideration as macropitting and bending in rating gears — especially in high-speed applications with high sliding velocities. Scuffing is not a fatigue phenomenon and may occur instantly, often during early stages of operation. This failure is directly related to the lubricant oil film, which does not adequately separate the surfaces. Figure 1 is a classic example of gear tooth scuffing.

16 Jul '19 Artec Machine Systems featured in GEAR Solutions Magazine

Gears are essential parts to the workings of countless machines, but when those machines are dependent on specifically designed gears, then service and repair can become a special niche.

For Artec Machine, servicing equipment furnished with specially engineered gearing is at the very heart of what the company does.

“We consider ourselves a leader on high-quality installations,” said John Amendola, CEO of Artec Machine. “We only work on engineered products. We don’t get involved much with commodity type gears. Gears that you can select out of a catalog, that’s not our business.”

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