1918

Item 1918

OTHER: Mechanical - Gear - Face

Notes:

Face gear Info:

http://www.gears-manufacturers.com/face-gear.html

http://gltrs.grc.nasa.gov/reports/1996/TM-107227.pdf, Have hard copy.

Simple envisionment: Consider the face gear as having an infinite diameter. In this scenario, its teeth would be cut to gear rack specifications and a perfect mesh would exist. This implies that very high ratios will allow for better fitting teeth.

Weird envisionment: It also congers up the possibility of using a hardened spur gear with a bronze (or aluminum) face gear and using the spur gear to grind or final-form (like rolled splines) the face gear.

A wonder if The Access forms can be used to work out the face gear parameters.

There's lots of good face gear tech data on NASA's server.

Musings:

Bisecting Angles on Face Gear: re Han's ability to produce a face gear.

	Degree:	Teeth in Face Gear:
	180	2
	90	4
	45	8
	22.5	16
	11.25	32
	5.625	64
	2.8125	128
	1.40625	256

Required ratio 8:1 128 / 8 = 16 teeth in spur gear

Pinion shaft; Pitch 64, 16 teeth, P.D. 0.25" O.D. 0.281" ~ Page 1-6

Face gear, 128 teeth, a guess at dimensioning 8 * 0.25 = 2.0" pitch diameter, ~ Reference Page 1-49 using spur teeth as guide for cutting face teeth.

Required ratio 8:1 = 96 teeth in face / 12 teeth in spur gear

Pinion shaft; Pitch 48, 12 teeth, P.D. 0.25" O.D. 0.292" ~ Page 1-6

Face gear, 96 teeth, a guess at dimensioning 8 * 0.25 = 2.0" pitch diameter, ~ Reference Page 1-49 using spur teeth as guide for cutting face teeth.

Notes from :

Face gears belong to the class of bevel gears, where the pinion has a bevel angle of 0° and the face gear has a bevel angle of 90°. ~ For this reason, you can also use a bevel gear strength calculation.

Geometry of face gears paired with cylindrical gear pinions. The 2D display dis-plays the inside, middle and outside of the face gear tooth form all at the same time. You can check for undercut and pointed teeth in the 2D graphic. You can pre-define the tip circle changes to prevent the creation of pointed teeth. 3D display with export option (option K05g*). Simulate the manufacturing process using a pinion type cutter to calculate the tooth form. This applies to straight and helical gears without offset and with a 90° shaft angle.

Patents:

There may be more.

5178028, 1/12/93, Offset face gear transmission

5233886, 8/10/93, Increased capacity face gear arrangement for transmitting torque through and angle ant to a plurrality of power extracting paths.

5572910, 11/12/96, Application of face gears to helicopter transmission.

Last Revised: May 26, 2011