Frequently Asked Questions

What does the Analysis program do?

This program will calculate the power rating of gears per AGMA 2001 and 2101-D004 standards.


What does the Dimension program do?

The Dimension program will calculate the information needed to manufacture and inspect gears. The values calculated consists of: dimension over pins, span measurement (base tangent), center distance (if not known), and tolerances for specified quality for external and internal pinion, gear or rack. The program will also calculate gear blank tolerance required to achieve quality level if diameters of shaft (or bore) are entered.


Abbreviations: What do they mean?

DP – Diametral Pitch – This is the common English system. DP = Number of teeth / (Pitch diameter [in] * cos (Helix angle))

Module – This is the metric counterpart of DP but acts in a reciprocal manner. Module = Pitch diameter [mm] * cos (Helix angle) / Number of teeth

CP [mm] – Circular Pitch in millimeters – Frequently used in servo systems with rack and pinion drive so that one turn of the pinion will move a member an even number of millimeters. Distance moved in one pinion revolution [mm] = Number of pinion teeth * CP [mm]

CP [in] – Circular Pitch in inches – Frequently used in servo systems with rack and pinion drive so that one turn of the pinion will move a member an even number of inches. Distance moved in one pinion revolution [in] = Number of pinion teeth * CP [in]


Standards: What standards are available?

AGMA A, AGMA Q, DIN (German International) and ISO (International Standards Organization) There are two AGMA (American Gear Manufacturers Association) standards. The older and more widely known is the “Q” standard. In this standard, increasing “Q” number means more precision, i.e., “Q3” is a fairly crude gear and “Q10” is a very accurate gear.

The other AGMA standard is the “A” standard. The quality number decreases with increasing precision in AGMA A, DIN (German International) and ISO (International Standards Organization) standards. (A quality number of 0, which does not exist, can be thought of as a perfect gear). These three quality numbers can be thought of as “inaccuracy numbers”, i.e., the larger the number, the more the inaccuracy.

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Scottsdale, AZ 85260

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