Miter Gears – Changes transmission direction only
Miter gears are one type of bevel gears where the two rotational axes intersect. When speaking of narrow definition of bevel gears with ability to increase or decrease speed, miter gears do not have that ability due to the pair’s same number of teeth. Their purpose is limited to the change in transmission direction. Because they are a type of bevel gears, the basic characteristic of bevel gears exist such as presence of gear forms of straight cut, spiral cut and zerol types.
Also, because the shafts can be set to any angle, there are miter gears with non-90 degree (non-perpendicular) angle called angular miter gears. KHK is capable of producing angular miter gears with shaft angles in the range of 45 to 120 degrees.
Because a pair of straight tooth miter gears has the same number of teeth, with the exception of minor differences such as set screw holes and key ways, the same two gears can mate with each other. However, in the case of spiral miter gears, even when the number of teeth are the same, the twisting directions are different. Therefore, the same gear cannot be meshed together, and it is necessary to pair the right and left handed pairs.
Also, to produce straight tooth miter gears. KHK utilizes Coniflex made by Gleason Company that allows the use of crowning method as in making bevel gears which creates final products superior in quietness.
Incidentally, originally the hat worn by Catholic bishop is called mitre and in woodworking the word miter joint is used.
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All Magnetic Products Catalog (PDF)
With this technical data you can view comprehensive information regarding KHK gears such as their features and advice and warnings when selecting and using them.
MMSGQ
Ground Spiral Miter Gears
Module : 2 – 4
Material : SCM415
Hardening : Curburized NOTE 1
Tooth finish : Ground teeth
Grade : JIS 0 (Please see details on PDF)
Gears that have been hardened and ground that has grade-0 accuracy, strength, abrasion resistance and quietness. Secondary operations can be given except for the teeth.
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MMSG
Ground Spiral Miter Gears
Module : 2 – 4
Material : SCM415
Hardening : Curburized NOTE 1
Tooth finish : Ground teeth
Grade : JIS 1 (Please see details on PDF)
Gears that have been hardened and ground that has excellent accuracy, strength and abrasion resistance. Secondary operations can be given except for the teeth.
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SMSG
Ground Spiral Miter Gears
Module : 1 – 4
Material : S45C
Hardening : Gear teeth induction hardened
Tooth finish : Ground teeth
Grade : JIS 2 (Please see details on PDF)
Gears that have been hardened and ground that has excellent abrasion resistance. Secondary operations can be given except for the teeth.
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MMSA / MMSB
Finished Bore Spiral Miter Gears
Module : 1 – 10
Material : SCM415
Hardening : Curburized
Tooth finish : Cut (non Ground)
Grade : JIS 4
Gears that have been fully hardened that have excellent strength and wear resistance. Can be used in the finished shape.
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MMS
Spiral Miter Gears
Module : 2 – 5
Material : SCM415
Hardening : Curburized NOTE 1
Tooth finish : Cut (non Ground)
Grade : JIS 4
Gears that have been hardened that have excellent strength and wear resistance. Secondary operations are possible except for the teeth.
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SMS
Spiral Miter Gears
Module : 1 – 8
Material : S45C
Hardening : Gear teeth induction hardened
Tooth finish : Cut (non Ground)
Grade : JIS 4 (Please see details on PDF)
Gears that have been hardened with excellent wear resistance. Secondary operations are possible except for the teeth.
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SMA / SMB / SMC
Finished Bore Miter Gears
Module : 1 – 5
Material : S45C
Hardening : Gear teeth induction hardened
Tooth finish : Cut (non Ground)
Grade : JIS 4
Gears that have been hardened with excellent wear resistance. Can be used in the finished shape.
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MM
Curburized/Hardened Miter Gears
Module : 2 – 5
Material : SCM415
Hardening : Curburized NOTE 1
Tooth finish : Cut (non Ground)
Grade : JIS 4 (Please see details on PDF)
Gears that have been hardened that have excellent strength and wear resistance. Secondary operations are possible except for the teeth.
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LM
Sintered Metal Miter Gears
Module : 0.8 – 1.5
Material : SMF5040
Hardening : None
Tooth finish : Sintered
Grade : JIS 5
Small gears made through sintering.
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SM
Steel Miter Gears
Module : 1 – 8
Material : S45C
Hardening : Please see details on PDF
Tooth finish : Cut (non Ground)
Grade : JIS 3 (Please see details on PDF)
Many lineups are available. The teeth can be additionally hardened.
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SAM
Angular Miter Gears
Module : 1.5 – 3
Material : S45C
Hardening : Please see details on PDF
Tooth finish : Cut (non Ground)
Grade : JIS 3
3 types of angular miter are available for shafts at 45°, 60° and 120°. The teeth can be additionally hardened.
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SUM
Stainless Steel Miter Gears
Module : 1 – 4
Material : SUS303
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Stainless steel gears with rust resistance.
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SUMA
Finished Bore Stainless Steel Miter Gears
Module : 1 – 4
Material : SUS303
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Stainless steel gears with rust resistance. Keyways and tapping provided.
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PM
Plastic Miter Gears
Module : 1 – 4
Material : MC901
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 4 equivalent
Nylon gears can be used with no lubrication.
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DM
Injection Molded Miter Gears
Module : 0.5 – 1.5
Material : DURACON (R) (M90-44) NOTE 2
Hardening : None
Tooth finish : Injection Molded
Grade : JIS 6
Low-priced gears made through injection molding. Suitable for light loads.
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BB
Sintered Metal Bushings
Nissei KSP
Ground Spiral Miter Gears
Module : 1.5 – 6
Material : SCM415 (SCM420)
Hardening : Curburized NOTE 1
Tooth finish : Ground teeth
Grade : JIS 0
Gears that have been hardened and ground that has grade-0 accuracy, strength, abrasion resistance and quietness. Secondary operations can be given except for the teeth.
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[NOTE 1] Although these are carburized products, secondary operations can be performed as the bore and the hub portions are masked during the carburization. However, note that high hardness (HRC40 at maximum) occurs in some cases.
[NOTE 2] "Duracon (R)" is a registered trademark of Polyplastics Co., Ltd. in Japan as well as other countries.
Related links :
等径锥齿轮
Bevel Gears– Main page of bevel gears
Equivalent tables of each standard relating to raw materials and precision grades of gears