## 20 Full Depth Involute System (ASA-B6b-1933)

### Small Pinions (5 To 16 Teeth)

WHEN PINIONS WITH SMALL NUMBERS OF TEETH ARE REQUIRED, IT IS NECESSARY TO ENLARGE THEIR DIAMETER TO AVOID EXCESSIVE UNDERCUTTING. THE FOLLOWING EQUATIONS APPLY TO PAIRS OF HELICAL GEARS WHEN THE DRIVING PINION HAS FROM 5 TO 16 TEETH.

WHEN,

• N 1 = NUMBER OF TEETH IN PINION

• N 2 = NUMBER OF TEETH IN GEAR

• C = CENTER DISTANCE

• P n = NORMAL DIAMETRAL PITCH

• = CIRCULAR PITCH IN PLANE OF ROTATION

• ? = HELIX ANGLE AT PITCH LINE

• R 1 = PITCH RADIUS OF PINION

• R 2 = PITCH RADIUS OF GEAR

• R o1 = OUTSIDE RADIUS OF PINION

• R o2 = OUTSIDE RADIUS OF GEAR

• R r1 = ROOT RADIUS OF PINION.

• R r2 = ROOT RADIUS OF GEAR

• T 1 = ARC TOOTH THICKNESS OF PINION IN PLANE OF ROTATION AT R 1

• T 2 = ARC TOOTH THICKNESS...

##### Products & Services
Rack and Pinion Drives
Rack and pinion drives use a rotational motor to affect linear motion via a rack and pinion combination. They are used frequently in long-travel applications, such as machine tool table positioning, that require high stiffness and accuracy.
Rack and Pinion Gears
Rack and pinion gears are used to convert rotation into linear motion.
Spline Shafts

A spline shafts has grooves or tongues machined along its length for torque transmission or anti-rotation linear guide applications.

Spur Gears

Spur gears are the simplest type of gear. Transmitting power between parallel axes, the teeth project radially on the disc.

Bevel and Miter Gears

Bevel gears are gears designed to transmit motion between intersecting axes. Perpendicular arrangements are most common, but bevel gears can be manufactured for nearly any angle. The teeth bearing surface of the gear, or surface pitch, is conically shaped or tapered. Miter gears are bevel gears manufactured in a 1:1 ratio, with the same number of teeth on mating gears and with perpendicular axes.

##### Topics of Interest

Recess Action Gear RECESS ACTION GEARS, ALSO KNOWN AS LONG AND SHORT ADDENDUM GEARING, INCREASES THE ADDENDUM ON THE DRIVER AND REDUCES IT ON THE FOLLOWER TO OBTAIN AS MUCH RECESS ACTION AS POSSIBLE.

14 Full Depth Involute System (Hobbed Spiral Gears) THE 14 DEGREE FULL DEPTH INVOLUTE SYSTEM IS THE BEST STANDARD SYSTEM TO USE FOR SPIRAL GEARS BECAUSE OF THE GREATER DURATION OF CONTACT SECURED BY...

14 Degree Involute System 14 Full Depth Involute System ASA-B6b-1933 20 Full Depth Involute System ASA-B6b-1933 20 Degree Full Depth Involute System WHEN PINIONS OF SMALL TOOTH NUMBERS ARE REQUIRED...

GEARING Nomenclature and Comparative Sizes of Gear Teeth American National Standard and Former American Standard Gear Tooth Forms ANSI B6.1-1968,R1974 and ASAB6.1-1932 Basic Rack of the 20-Degree...

Overview Q3-1 With spur gears having twisted teeth (cycloidal), what is the form of the line of contact along the tooth surface? What is the form of pitch surface in spur gears, bevel gears, hypoid...

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