Red Lion GEARS User Manual

Bulletin No. GRS-J

Drawing No. LP0167

Released 06/13

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MACHINED STEEL SENSING GEARS FOR EXCITING SENSORS

Sensing Gears are available in a variety of sizes to cover most applications
where a sensor is to be used, but a suitable existing machine gear is not
available. Split-type gears are convenient for use on machine drive shafts where
a shaft-end is not available to mount a standard gear. Hubless gears are ideal for
mounting in tight locations or when only a short shaft stub is available. Hub­type, Split, and Hubless gears can be supplied with special bores (See notes
below Ordering Information & Dimensions table).

Caution: RLC’s machined steel sensing gears are NOT to be used as driving or

driven gears in a power transmission system.

HUB TYPE GEARS SPLIT GEARS HUBLESS GEARS

SET SCREW

O.D. D

SOCKET HEAD

LOCK

WASHER (2)

BORE

P

F

FLAT

WASHER

SPACER (2)

CAP SCREW (2)

BORE

O.D.

O.D.

*F

SET SCREW

BORE

ORDERING INFORMATION & DIMENSIONS

NO. OF STOCK MAX. SPL. HUB RECOMMENDED RECOMMENDED

DIAMETRAL +0.003" +0.003" ±0.003"
PITCH -0.000" -0.000" SCREWS SPEEDS

30 T. 16 D.P. 0.500" 1.375" 2.000" 1.625" 0.500" 0.500" 25 in. lbs. 5000 RPM 0950500
HUB TYPE 60 T. 20 D.P. 0.375" 1.750" 3.100" 2.000" 0.500" 0.375" 25 in. lbs. 5000 RPM 0970375
60 T. 10 D.P. 0.875" 2.250" 6.200" 2.500" 0.875" 1.000" 55 in. lbs. 5000 RPM 0910875

60 T. 10 D.P. 0.875" 4.250" 6.200" *1.000" 182 in. lbs. 1500 RPM 0930875
60 T. 20 D.P. 0.625" 0.870" 3.100" 0.375" 25 in. lbs. 5000 RPM 0960625
60 T. 20 D.P. 0.875" 0.875" 3.100" 0.375" 25 in. lbs. 5000 RPM 0960875
HUBLESS 60 T. 12 D.P. 1.125" 1.370" 5.160" 0.656" 40 in. lbs. 5000 RPM 0941125
60 T. 12 D.P. 1.375" 1.620" 5.160" 0.656" 40 in. lbs. 5000 RPM 0941375
60 T. 12 D.P. 1.625" 1.625" 5.160" 0.656" 40 in. lbs. 5000 RPM 0941625

TEETH & BORE BORE O.D.

TYPE

SPLIT GEAR

30 T. 10 D.P. 0.750" 1.875" 3.200" *1.000" 182 in. lbs. 3000 RPM 0920750

DIA “D” PROJ “P”
±0.010" ±0.020"

FACE “F” TORQUE FOR MAXIMUM PART

±0.010" SET & CAP GEAR NUMBER

* A portion of the teeth near the cap screws are milled away. However, at least ¼" of the teeth face width is available, allowing sensing of all teeth.

F

SPECIAL BORES: Hub-Type, Split, and Hubless gears can be supplied with

special bore sizes between the Stock Bore and Max. Special Bore sizes listed
above. To order Special Bores, substitute 9999 for the last 4 digits of the part
number and specify special bore size required.

ASSEMBLY NOTE FOR SPLIT GEARS: When tightening the split gear

halves on a shaft, it is recommended that the flat washer spacers be used to
help keep the gap between halves equal.
Run-out should be checked after installation is complete. Always use the
supplied lock washers when tightening the socket head cap screws. Torque
these screws to 182 in. lbs.

STANDARD SPUR GEAR DEFINITIONS, RELATIONSHIPS & FORMULA

Gear parameters are fundamentally related to their use as power transmission elements. Although these
parameters are not the most convenient when using gears to excite magnetic pickups, they can be easily converted
to more useful form, once the basic definitions are understood.

PITCH DIAMETER (P.D.) - The diameter of the circle described by the tooth-

to-tooth contact point when running in mesh with the teeth of another gear.
This point is roughly half way between the root (bottom) and the tip of the
gear tooth. The Pitch Diameter is slightly smaller than the outside diameter
of the gear.

DIAMETRAL PITCH (D.P.) - The number of teeth/inch of Pitch Diameter.

Thus a 20 D.P. gear has 20 teeth for each inch of Pitch Diameter. A 60-tooth,
20 D.P. gear would have a pitch diameter of 3', a 60T, 10 D.P. gear has a Pitch
Diameter of 6'.

PRESSURE ANGLE - Pressure angle relates to tooth shape and strength. It has

no significant effect on the operation of the gear for exciting magnetic
pickups, and pickups can be used with gears of any pressure angle.

OUTSIDE DIAMETER (O.D.) - The outside diameter is the overall diameter

of the gear to the tops of the teeth, and is used for calculating surface speed
when the gear is used to excite a magnetic sensor. The O.D. can be
determined from the following formula:

RPM x Nt

O.D. =

Example: A 60T, 16 D.P. Gear has an O.D. of:

O.D. =

10 x 60

3.1 x π

60

= 3.875 inches

SURFACE SPEED - The output of a magnetic pickup depends on the linear

surface speed of the tops of the passing gear teeth. Surface speed is normally
expressed in inches/sec. and can be calculated for a given gear as follows:

50 x 3.1 x π

Surface Speed in inches /sec. =

60 +2

or; RPM =

60

20

Example: What is the surface speed of the 60T, 20 D.P. Gear when running

at 50 RPM? At what RPM will the 1-Volt Threshold Speed (10 inches/sec.)
for the MP-62TA be realized?

Surface Speed x 60

Gear O.D. =

Surface Speed =

1-Volt Threshold RPM (@ 10 in/sec.) =

O.D. x π

RPM x O.D. x π

= 3.1" (From O.D. formula above)

60

= 8.115 inches /sec.

60 + 2

16

= 61.61 RPM

OUTPUT SIGNAL FREQUENCY - The frequency generated by passing gear

teeth is related to gear RPM and the number of gear teeth (Nt) by the
following:

Output frequency (Hz or teeth/sec.) =

Nt(No. of teeth) + 2

D.P. (Diametral Pitch)

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