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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One direction of rotation. Table 3 gives the resulting face width and center distance to meet aggma minimum service factor for that standard. At this revision, the formulas for the durability and strength horsepower wgma were removed from the standard and were replaced by referring to the basic rating standard AGMA was the standard before the new numbering system.
The rating is for a minimum of 40, operating hours, using the most conservative stress cycle life factor.
It is limited to gearboxes with gear tooth pitch line velocities below 12, fpm 60 mps for parallel shafts or fpm 40 mps for bevel shafts. 600 manufacturers recognize that a more detailed analysis is important on high ratio gearing. The gear has many cycles for every turn it makes.
The conclusion is that DINPart 21calculates a minor increase over AGMA for through-hardened gearing and a major increase for carburized gearing. A copy of typical geometry factors is included Figure 1 to give a guideline for this value. The proposed rating method is more complicated than API because of the increased detail. The rating methods and influences identified in this Standard are limited to enclosed 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.
Standards Subsctiption may be the perfect solution. The conditions are a synchronous motor driving a centrifugal compressor through a gearbox.
View Cart Checkout 610 Shopping. 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.
Let us begin with a brief description of these standards: Smaller size and aga weight. Already Subscribed to this document. The response usually is that being substantially below the allowable only increases the service factor, which is already very high, therefore, it is not necessary.
This standard generally does not apply to high-speed turbomachinery, but is included for comparative purposes. The size and therefore the price of zgma gearbox depend on the gear-rating method specified. The rating formulas were simplified from the AGMA standards and more conservative stresses were required. The following are the major technical areas that require detailed review prior to the selection of the specific gear design and its suppliers.
Normal diametral pitch 5; Backlash 0. Casing Fabrication Cast casings are more commonly used due to their lower cost agmz shorter delivery time, and to comply with low noise requirements.
Gearbox specs: Getting it right | Turbomachinery Magazine
Less thermal distortion due to shorter tooth. Be aware that the gearbox will be oversped during testing. The resulting ratings range from to over 18, HP. Speakers in the Classroom. Quantity must be a positive whole number.
The information on the API data sheet is as follows: The difference in strength ratings is probably because of the different methods in calculating the J factor. For the pitting ratings, all ratings that use AGMA methods as their basis are consistent.
The rating methods used agja the API and API standards are highly valued by many because they are consistent between manufacturers and easily checked by purchasers and users. Comparisons with API have resulted in virtually the same durability ratings, but different strength ratings. This Standard does not apply to gear drives that are covered by other specific AGMA application standards.
Gearbox specs: Getting it right
Frequently used for medium power applications Easy to repair. However, it does incorporate language to allow the use of alternate rating methods if the API method would result in excessive pitch line velocity or excessive face width.
The standard evolved through The decision was appealed and is currently going through the AGMA appeal process. The added areas are: In a multireduction gearbox, the gear tooth pitch line velocity must be over fpm 33 mps in the fastest gear set and at least fpm 8 mps in other gear sets. Higher efficiency due to smaller losses and lower lube oil requirements. Method C is a simplified method used for narrow applications.
Lufkin, Texas and Vinod P. The allowable bending stress number depends on materials selected for the gear teeth, the tooth hardening processes used, and the service factor. A different way to present the difference between the size of the gear set rated by both standards is to pictorially represent them.
If the document is revised or amended, you will be notified by email. Another way to consider these results is to look at the ratio of the ratings.
review of api versus agma gear standards—rating, data sheet
This Standard is not intended to assure performance of assembled gear drive systems. It will vary slightly among manufacturers depending on the shape of the roughing and finishing tool as well as heat-treating distortion.
Both the speed and pitch line velocity overlap with the AGMA standard, so care must be taken to specify which standard prevails in the overlap situation.