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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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It is primarily intended for gears that are in continuous service without installed spare equipment.

Gearbox specs: Getting it right | Turbomachinery Magazine

It is not intended for use by the engineering public at large E xceptions. To understand how much the API standard affects the efficiency, an example qgma a hp electric motor at rpm driving through a gearbox gama a rpm centrifugal compressor is offered in Table 2. A copy of typical geometry factors is included Figure 1 to give a guideline for this value.

The rating methods used in the API and API standards are highly valued by many because they are consistent between manufacturers and easily checked by purchasers and users.

Primary & Secondary Drives for Dams & Spillways | Bridge & Dam Market | Nuttall Gear

Since college graduation he has been in gear engineering with Lufkin Industries. The second edition changed the rating method to that given in 6100 The proposed rating method is more complicated than API because of the increased detail. The rating results are presented even if the pinion agja or the pitch line velocity is too high or low for the standard to apply.

This confusion is increased when comparing international and domestic standards. The gear set is agmma and has a The strength rating is checked by using the formula for the bending stress number.


For the pitting ratings, all ratings that use AGMA methods as their basis are consistent. Agmma, 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. Helix angle is usually in the range of 5 to Your Alert Profile lists the documents that will be monitored.

For a given gearbox, the rating system that is used can give very different answers in the amount of power that can be transmitted.

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. Gearbox users sometimes question the manufacturer when the actual K factor is the same or only slightly below the allowable K factor.

Following is a brief history of the Standard: The allowable K factor is calculated as follows: It is intended for use by the experienced gear designer capable of selecting reasonable values for the factors, based on his knowledge of performance of similar designs and the effects of such items as lubrication, deflection, manufacturing tolerances, metallurgy, residual stress and system dynamics.

Equalized axial thrust from the gear teeth Higher efficiency due to low thrust bearing losses and less 60100 oil requirements. For case- and surface-hardened gears, there is about a two-to-one ratio from the highest to lowest ratings for a specific gear set.

Frequently used for medium power applications Easy to repair. Aggma guideline is listed in paragraph 2. There are also changes occurring in the gear tooth quality standards. There are no products. Following is a brief history of the standard: DINPart 21would allow 92 percent more power; however, this would probably be derated due 60010 scoring calculations or require that special lubricants be used.


Figure 5 is plotted for seven different gear sets at different power ratings.

For single helical gear sets, the calculation is typically based on the shorter of the pinion or the gear tooth length, if they are different.

It will vary slightly among manufacturers depending on the shape of the roughing and finishing tool as well as heat-treating distortion. In aga 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.

Gearbox specs: Getting it right

For instance, some designs have many pinions in mesh with one gear. 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. Notice that the pinion will have a different bending stress number than the gear, so both must be checked. A summary of these changes is as follows: Pitch dia, in Pinion 8.

Smaller size and less weight. Less expensive to fabricate gear elements. Speeds range from to 45, RPM.

Its gear tooth rating system refers to the formulas in the basic rating standard AGMA