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. Hub-
type, 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.
NO. OF STOCK MAX. SPL. HUB RECOMMENDED RECOMMENDED
TYPE TEETH & BORE BORE O.D. DIA “D” PROJ “P” FACE “F” TORQUE FOR MAXIMUM PART
DIAMETRAL +0.003" +0.003" ±0.003"
±0.010" ±0.020" ±0.010" SET & CAP GEAR NUMBER
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
SPLIT GEAR 30 T. 10 D.P. 0.750" 1.875" 3.200" *1.000" 182 in. lbs. 3000 RPM 0920750
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
* 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.
MACHINED STEEL SENSING GEARS FOR EXCITING SENSORS
HUB TYPE GEARS SPLIT GEARS HUBLESS GEARS
SET SCREW
O.D. D
P
F
BORE
SOCKET HEAD
CAP SCREW (2)
LOCK
FLAT
BORE
*F
O.D.
WASHER (2)
SPACER (2)
WASHER
O.D.
F
BORE
SET SCREW
ORDERING INFORMATION & DIMENSIONS
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.
Bulletin No. GRS-J
Drawing No. LP0167
Released 06/13
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
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:
O.D. =
RPM x Nt
60
Example: A 60T, 16 D.P. Gear has an O.D. of:
O.D. =
10 x 60
3.1 x π = 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:
Surface Speed in inches /sec. =
50 x 3.1 x π
60
or; RPM =
60 +2
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?
Gear O.D. =
Surface Speed x 60
O.D. x π = 3.1" (From O.D. formula above)
Surface Speed =
RPM x O.D. x π
60 = 8.115 inches /sec.
1-Volt Threshold RPM (@ 10 in/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)
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.
Red Lion Controls
Headquarters
20 Willow Springs Circle
York PA 17406
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
Red Lion Controls
China
Unit 302, XinAn Plaza
Building 13, No.99 Tianzhou Road
ShangHai, P.R. China 200223
Tel +86 21 6113 3688
Fax +86 21 6113 3683
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Europe
Softwareweg 9
NL - 3821 BN Amersfoort
Tel +31 (0) 334 723 225
Fax +31 (0) 334 893 793
Red Lion Controls
India
201-B, 2nd Floor, Park Centra
Opp 32 Mile Stone, Sector-30
Gurgaon-122002 Haryana, India
Tel +91 984 487 0503
