Buy AGMA F STANDARD FOR SPUR, HELICAL, HERRINGBONE AND BEVEL ENCLOSED DRIVES from SAI Global. AGMA (R) Spur, Helical, Herringbone, and Bevel Enclosed Drives Applicable to enclosed gear drives wherein the gear tooth designs include . Buy AGMA Practice For Enclosed Speed Reducers Or Increasers Using Spur , Helical, Herringbone And Spiral Bevel Gears from SAI Global.

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review of api versus agma gear standards—rating, data sheet

Itinerary and Gear List. It is recognized as having a good thermal rating method. Less thermal distortion due to shorter tooth. These high ratio gear sets are typically used in integral compressor drives and often use a carburized pinion with a through-hardened gear.

The material index number is based on the hardness and the heattreating process. An even wider range of gears could have been analyzed, but that probably would not significantly change the general conclusions of this study. It evolved from the DINPart 21standard, so there is a strong similarity between the two. Helix angle is usually in the range of 20 to ISO does not directly calculate an allowable power for a gear set, nor does AGMA calculate a service factor.

Special software designing for drawing of gear K. The standard AGMA Because some of the factors are load dependent, it is not possible to calculate the capacity of the gear set unless the load is known, unlike the AGMA standard.

The second edition changed the rating method to that given in API Be aware that the gearbox will be oversped during testing. It is primarily intended for gears that are in continuous service without installed spare equipment. This Standard does not cover the design and application of epicyclic drives or gear blank design. A different way to present the difference between the size of the gear set rated by both standards is to pictorially represent them.


In this assignment, he is responsible in the preparation and auditing of specifications, equipment evaluation, engineering coordination, and testing and installation startup of rotating and special equipment.

Symmetrical thermal distortion for the gear casing. This hardness combination is not addressed in API Frequently used for higher power applications for a agka size, can transmit twice the power as BHN.

The intent of this paper is to educate the purchaser and user to know what to specify for better understanding of gear ratings and to hopefully reduce gear problems.

Gearbox specs: Getting it right

It does not apply to bevel or internal gearing. In comparisons presented at the API committee meeting insome gear set ratings were slightly higher and some were slightly lower than API To quote Annex G, paragraph Ayma. This Standard is applicable to enclosed speed reducers and increasers wherein the gear tooth designs include spur, helical, herringbone or double helical, bevel, and their combination in multi – stage units.

An example of a gearbox fitting into this overlap is an hp, rpm electric motor driving agmaa a speed increasing gearbox to a rpm centrifugal compressor. Requires thrust bearings and thrust faces on each rotor. In addition to confusing the purchaser and user, gear manufacturers are Vinod P. Helix angle is usually in the range of 5 to The resulting ratings range from to over 18, HP.

The majority of heavy industrial gears are of single or double helical gear design. This will determine if the bidders are in compliance with applicable specifications and data sheets.

ANSI/AGMA A06 – Standard for Industrial Enclosed Gear Drives

If the document is revised or amended, you will be notified by email. Equalized axial thrust from the gear teeth Higher efficiency due to low thrust bearing losses and less lube oil requirements.

Gearbox users sometimes question the manufacturer when the actual K abma is the same or only slightly below the allowable K factor. The minimum gear service factors are in Table 2 on page 6.


For designs based on APIpinions will be integrally forged with their shafts.

AGMA 6010-E88 – Standard for Spur, Helical, Herringbone, and Bevel…

The gear tooth strength ratings seem to be always higher using ISO The rating is for 10, operating hours using the least conservative life factors.

The ISO is recognized as being more complex and detailed that AGMArequiring about 20 more pieces of information to calculate a gear set rating. This resulted in the allowable stresses being set lower than necessary.

The characteristic of driver and driven equipment will account for potential overload, shock load, or continuous oscillatory torque characteristics. Rest of the article is in the Turbomachinery Handbook http: The designer has some limited choices when rating a long life gear set. This confusion is increased when comparing international and domestic standards.

Since college graduation he has been in gear engineering with Lufkin Industries. They are as follows: This standard is based on analyzing a gear set with mm centers, then modifying the results by a series of factors such as size, speed, material, surface condition, and lubricant factors. He is a registered Professional Engineer in the State of Texas. Substituting into Equation 4: In US customary units, Wt can be expressed as follows: DINPart 21would allow 92 percent more power; however, this would probably be derated due to scoring calculations or require that special lubricants be used.

The rating methods and influences identified in this Standard are limited to agm drives of single and multiple stage designs where the pitch line velocities do not exceed feet per minute and pinion speeds do not exceed revolutions per minute.