Characteristics

KHK stock CP racks and pinions are suitable in applications where very accurate positioning in linear motion is required. For your convenience, we offer circular pitches of 2.5 to 20 mm and in lengths of 100 to 2000 mm. (FRCP is available to 4000 mm)

Movement of one cycle of the CP10-30 pinion on a CP rack vs.SS3-30 (m3) on a m3 rack.
Movement of one cycle of the CP10 30 pinion on a CP rack vs.SS3 30 (m3) on a m3 rack

About CP Racks & Pinions

The reference pitch of a metric module is computed by multiplying the number of module by π (3.14159). For example, the reference pitch of m 3 rack is 9.425 mm (3 * π). When using a rack and a pinion in a linear motion application, the fact that the pitch is not an integral number presents a difficulty in accurate positioning. This problem is solved by CP racks and pinions where one rotation of a pinion moves it precisely 50, 100, 150, … or 600 mm. The following table lists the main features. The following table lists the main features.

Racks

  • Catalog No. Note 1 : STRCPF / STRCPFD
    Pitch (mm) : 5, 10
    Total Length (mm) : 1000
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 4
    Features : By pairing with KTSCP pinion, the backlash may be adjusted.
  • Catalog No. Note 1 : MRGCPF / MRGCPFD
    Pitch (mm) : 1.5-3
    Total Length (mm) : 500
    Material : SCM415
    Heat Treatment : Tooth area Carburized
    Tooth Surface Finish : Ground
    Precision KHK R 001 : 1
    Features : Has the highest strength and precision in the KHK standard rack series. Bolt holes can be remachined as carburizing is applied only within the tooth area. J Series products are also available.
  • Catalog No. Note 1 : KRGCPF – H / KRGCPFD – H
    Pitch (mm) : 5, 10
    Total Length (mm) : 500, 1000
    Material : SCM440
    Heat Treatment : Thermal refined, teeth induction hardened
    Tooth Surface Finish : Ground
    Precision KHK R 001 : 1
    Features : Heat treated ground gears with high precision and strength has excellent cost-performance ratio. J Series products are also available.
  • Catalog No. Note 1 : KRGCP / KRGCPF / KRGCPD
    Pitch (mm) : 5, 10
    Total Length (mm) : 100, 500, 1000
    Material : SCM440
    Heat Treatment : Thermal Refined
    Tooth Surface Finish : Ground
    Precision KHK R 001 : 1
    Features : High strength and abrasion-resistant for precision linear motion.
  • Catalog No. Note 1 : SRGCP / SRGCPF / SRGCPFD
    Pitch (mm) : 5, 10, 15, 20
    Total Length (mm) : 100, 500, 1000
    Material : S45C
    Heat Treatment : Gear teeth induction hardened
    Tooth Surface Finish : Ground
    Precision KHK R 001 : 3
    Features : Reasonably priced ground racks with abrasion-resistant characteristics. J Series products are also available.
  • Catalog No. Note 1 : KRCPF-H / KRCPFD-H
    Pitch (mm) : 5, 10
    Total Length (mm) : 1000
    Material : SCM440
    Heat Treatment : Thermal refined, teeth induction hardened
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 5
    Features : This is a strong rack made of Chromoly steel, treated by carburizing. Has high-strength, high wear resistance, and enables downsizing of SR racks. J Series products are also available.
  • Catalog No. Note 1 : SRCPF-H / SRCPFD-H
    Pitch (mm) : 5, 10, 15, 20
    Total Length (mm) : 1000
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 5
    Features : Stable Hardened racks with high strength, long life span are reasonably priced. J Series products are also available.
  • Catalog No. Note 1 : SRCPF-H / SRCPFD-H
    Pitch (mm) : 5, 10, 15, 20
    Total Length (mm) : 1000
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 5
    Features : Stable Hardened racks with high strength, long life span are reasonably priced. J Series products are also available.
  • Catalog No. Note 1 : KRCPF  /  KRCPFD
    Pitch (mm) : 5, 10
    Total Length (mm) : 1000
    Material : SCM440
    Heat Treatment : Thermal Refined
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 4
    Features : Increased strength with SCM440 material which is thermal refined.
  • Catalog No. Note 1 : SRCP / SRCPF / SRCPFD / SRCPFK
    Pitch (mm) : 2.5, 5, 10, 15, 20
    Total Length (mm) : 100, 500, 1000, 1500, 2000
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 4
    Features : Widely applicable due to low cost and large selection of pitches and lengths.
  • Catalog No. Note 1 : SURCPF / SURCPFD
    Pitch (mm) : 5, 10
    Total Length (mm) : 500, 1000
    Material : SUS304
    Heat Treatment : Solution treated
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 5
    Features : Suitable for food machinery due to SUS304 material’s rust-resistant quality.
  • Catalog No. Note 1 : SROCP
    Pitch (mm) : 2.5, 5, 10
    Total Length (mm) : 500
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 4
    Features : Convenient in applications where the rack has reciprocal motion.
  • Catalog No. Note 1 : FRCP
    Pitch (mm) : 5
    Total Length (mm) : 2000, 3000, 4000
    Material : SS400
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision KHK R 001 : 8
    Features : Cut continuously. Long length and bendable to a contour.

 

Pinions

  • Catalog No. Note 1 : KTSCP
    Pitch (mm) : 5, 10
    Number of teeth : 20-40
    Material : SCM440
    Heat Treatment : Thermal refined
    Tooth Surface Finish : Cut
    Precision JIS B 1702-1 : N8
    Features : By pairing with STRCPF rack, the backlash may be adjusted.
  • Catalog No. Note 1 : MSCPG
    Pitch (mm) : 5, 10
    Number of teeth : 20-40
    Material : SCM415
    Heat Treatment : Overall carburizing
    Tooth Surface Finish : Ground
    Precision JIS B 1702-1 : N5
    Features : Designed with positive partial transposition and to have an integral value (mm) for the mounting distance, so both strength and usability are enhanced.
  • Catalog No. Note 1 : MSCPG
    Pitch (mm) : 5, 10
    Number of teeth : 20-40
    Material : SCM415
    Heat Treatment : Overall carburizing
    Tooth Surface Finish : Ground
    Precision JIS B 1702-1 : N5
    Features : Designed with positive partial transposition and to have an integral value (mm) for the mounting distance, so both strength and usability are enhanced.
  • Catalog No. Note 1 : SSCPGS
    Pitch (mm) : 5, 10
    Number of teeth : 10-25
    Material : S45C
    Heat Treatment : Thermal refined, teeth induction hardened
    Tooth Surface Finish : Ground
    Precision JIS B 1702-1 : N7
    Features : Ground Spur Gears with Pinions, can be directly assembled with the shaft bearing, by modifying the pinion.
  • Catalog No. Note 1 : SSCPG
    Pitch (mm) : 5, 10, 15, 20
    Number of teeth : 20-40
    Material : S45C
    Heat Treatment : Gear teeth induction hardened
    Tooth Surface Finish : Ground
    Precision JIS B 1702-1 : N7
    Features : Perform secondary operations to suit your requirement on these ground CP spur gears.
  • Catalog No. Note 1 : KSCP
    Pitch (mm) : 5, 10
    Number of teeth : 20-40
    Material : SCM440
    Heat Treatment : Thermal refined, teeth induction hardened
    Tooth Surface Finish : Cut
    Precision JIS B 1702-1 : N9
    Features : Thermal refined and tooth-hardened chromoly racks, excellent in abrasion resistance. Use as mating pinions for KRCPF(-H) Racks.
  • Catalog No. Note 1 : SSCP
    Pitch (mm) : 2.5, 5, 10, 15, 20
    Number of teeth : 20-40
    Material : S45C
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision JIS B 1702-1 : N8
    Features : Low cost and widely applicable, with a large selection of pitches and numbers of teeth.
  • Catalog No. Note 1 : SUSCP
    Pitch (mm) : 5, 10
    Number of teeth : 20-30
    Material : SUS303
    Heat Treatment : –
    Tooth Surface Finish : Cut
    Precision JIS B 1702-1 : N8
    Features : Suitable for food machinery due to SUS303 material’s rust-resistant quality.

[NOTE 1] The catalog numbers in the above tables with a suffix of F have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.

For safer handling and to prevent damage such as deformation, KHK stock CP racks have round chamfering on the corners of the top land of the gear tooth. This rounded chamfered shape is patented by KHK. Because it is effective for reducing noise, all of KHK CP racks have this chamfering treatment.
Black colored products are KHK stock gears that have an applied black oxide coating for rust resistance; this ‘blackness’ is a product characteristic of KHK stock gears.

Selection Hints

Please select the most suitable products by carefully considering the characteristics of items and contents of the product tables. It is also important to read all applicable notes before the final selection.

1. Caution in Selecting the Mating Gears

  1. KHK stock CP racks are mated with CP spur gears having the same pitch. Since CP2.5 (m0.796), CP5 (m1.592) and CP10 (m3.183) are very close in size to m0.8, m1.5 and m3 respectively, the selecting the proper mating gear should be verified to make sure that the items are correct. Otherwise, complications could arise.
  2. STRCPF and STRCPFD Tapered Racks are mated with KTSCP Spur Gears having the same pitch. They can also be mated with other spur gears, however, they can not be used as parallel axis gears due to the setting angles.

2. Caution in Selecting Gears Based on Gear Strength

The gear strength values shown in the product pages were computed by assuming a certain application environment. Therefore, they should be used as reference only. We recommend that each user computes his own values by applying the actual usage conditions. The table below contains the assumptions established for these products in order to compute gear strengths.

Calculation assumptions for Bending Strength

  • Catalog No. : MRGCPF / MRGCPFD
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 47
    Safety factor SF : 1.2
  • Catalog No. : KRGCPF-H / KRGCPFD-H
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 32
    Safety factor SF : 1.2
  • Catalog No. : KRGCP / KRGCPF / KRGCPD / KRCPF
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 32
    Safety factor SF : 1.2
  • Catalog No. : SRGCP / SRGCPF / SRGCPFD
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 20
    Safety factor SF : 1.2
  • Catalog No. : SRCP / SRCPF / SRCPFD / SROCP / STRCPF / STRCPFD
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 20
    Safety factor SF : 1.2
  • Catalog No. : SURCPF / SURCPFD / FRCP
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : 30
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 10.5
    Safety factor SF : 1.2
  • Catalog No. : MSCPG
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 47
    Safety factor SF : 1.2
  • Catalog No. : SSCPGS
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 24.5
    Safety factor SF : 1.2
  • Catalog No. : SSCPG
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 19
    Safety factor SF : 1.2
  • Catalog No. : KTSCP
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 28.5
    Safety factor SF : 1.2
  • Catalog No. : KSCP
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 30
    Safety factor SF : 1.2
  • Catalog No. : SSCP
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 19
    Safety factor SF : 1.2
  • Catalog No. : SUSCP
    Formula NOTE 1 : Formula of spur and helical gears on bending strength (JGMA401-01)
    No. of teeth of mating gear : Racks
    Rotation : 100rpm
    Durability : Over 10^7cycles
    Impact from motor : Uniform load
    Impact from load : Uniform load
    Direction of load : Bidirectional
    Allowable bending stress at root σ Flim(kgf/mm^2) NOTE 2 : 10.5
    Safety factor SF : 1.2

 

Calculation assumptions for Surface Durability (Except those in common with bending strength)

  • Catalog No. : MRGCPF / MRGCPFD
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 106
    Safety factor SH : 1.15
  • Catalog No. : KRGCPF-H / KRGCPFD-H
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 112
    Safety factor SH : 1.15
  • Catalog No. : KRGCP / KRGCPF / KRGCPD / KRCPF
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 79
    Safety factor SH : 1.15
  • Catalog No. : SRGCP / SRGCPF / SRGCPFD
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 90
    Safety factor SH : 1.15
  • Catalog No. : SRCP / SRCPF / SRCPFD / SROCP / STRCPF / STRCPFD
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 52.5
    Safety factor SH : 1.15
  • Catalog No. : SURCPF / SURCPFD / FRCP
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 41.3
    Safety factor SH : 1.15
  • Catalog No. : MSCPG
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 166
    Safety factor SH : 1.15
  • Catalog No. : SSCPGS
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 99
    Safety factor SH : 1.15
  • Catalog No. : SSCPG
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 90
    Safety factor SH : 1.15
  • Catalog No. : KTSCP
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 74.5
    Safety factor SH : 1.15
  • Catalog No. : KSCP
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 112
    Safety factor SH : 1.15
  • Catalog No. : SSCP
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 49
    Safety factor SH : 1.15
  • Catalog No. : SUSCP
    Formula NOTE 1 : Formula of spur and helical gears on surface durability (JGMA402-01)
    Kinematic viscosity of lubricant : 100cSt (50 deg C)
    Gear support : Support on one end
    Allowable Hertz stress σ Hlim (kgf/mm^2) : 41.3
    Safety factor SH : 1.15

[NOTE 1] The gear strength formula is based on JGMA (Japanese Gear Manufactures Association) specifications. The units for the number of rotations (rpm) and the stress (kgf/mm^2) are adjusted to the units needed in the formula.
[NOTE 2] The allowable bending stress at the root σ Flim is calculated from JGMA401-01, and set to 2/3 of the value in the consideration of the use of planetary-, idler-, or other gear systems, loaded in both directions.

Definition of bending strength by JGMA 401-01 (1974)

The allowable bending strength of a gear is defined as the allowable tangential force at the pitch circle based on the mutually allowable root stress of two meshing gears under load.
The allowable bending strength
Example of the failure due to insufficient bending strength.

Definition of surface durability by JGMA 402-01 (1975)

The surface durability of a gear is defined as the allowable tangential force at the pitch circle, which permits the force to be transmitted safely without incurring
surface failure.
Definition of surface durability by JGMA 402 01
Example of the defacement due to insufficient surface durability.

3. Selecting Racks By Precision

The precision standards of KHK stock racks are established by us. Please be sure to see the pages below when selecting.

  1. Pitch Error of Racks NOTE 2 (KHKR001) – Page 190
  2. Precision of Rack Blanks NOTE 2 – Page 191
  3. Backlash of Rack Tooth – Page 191

[NOTE 2] Convert CP to m (module) when reference is made to the data in the table. (m=CP/π)

Application Hints

In order to use KHK stock gears safely, carefully read the Application Hints before proceeding. If there are questions or if you require clarifications, please contact our technical department or your nearest distributor.

KHK CO., LTD.
PHONE: 81-48-254-1744 FAX: 81-48-254-1765
E-mail info@khkgears.net

1. Caution on Performing Secondary Operations

  1. CP racks except for the racks where the gear teeth are induction hardened. To avoid problems of gear precision, do not reduce the face width. The precision of ground racks and racks with mounting holes may drop if you do not exercise extreme caution during installation or while modifying.
  2. Pitch lines of racks are controlled by using the bottom surface as the reference datum and over-pin measurements on tooth thickness. If you machine the bottom surfaces, the precision of the racks may be affected.
  3. When connecting two racks, the machining of the mating ends requires careful consideration. The meshing will be poor if the pitch (CP) straddling the connection has a positive tolerance. We recommend a minus tolerance on pitch of at the connection. The below is an indication of pitch tolerance for each module.
    Caution on Performing Secondary Operations 1
    Caution on Performing Secondary Operations 2
  4. To use dowel pins to secure racks, attach the racks to the base and drill both simultaneously.
  5. KHK stock CP racks made of S45C and SCM440 (except for ground racks) can be induction hardened. However, the precision of pitch is decreased.
  6. To be able to handle parts safely, all burrs and sharp corners should be removed after the secondary operations are done.
  7. If you are going to modify the gear by gripping the teeth, please exercise caution not to crush the teeth by applying too much pressure. Any scarring will cause noise during operation.

2. Points of Caution in Assembling

  1. KHK stock CP racks are designed to give the proper backlash when assembled using the mounting distance given by the formula below (mounting distance tolerance of H7 to H8 required). The backlash values are given in the table on Page 191. Make sure that the mounting distance stays constant for the length of the rack.
    Mounting distance a = Height of pitch line of rack + Pitch radius of pinion
    Points of Caution in Assembling 1
    [CAUTION] Pinions are assumed to be standard stock spur gears (x=0).
  2. KRGCP type of KHK stock ground racks have four surfaces ground parallel to within 10 – 15 μm. To maintain true angle, they should be mounted on high precision bases as shown below. It is even possible to correct for the angular errors of racks by compensating the mounting base. With recent increases in the requirement for zero backlash linear drives, such accurate assembly as shown is becoming more important.
    Points of Caution in Assembling 2
  3. If the racks are not secured properly to the base, they could shift during operation and cause unexpected problems. It is very important to insure firm mounting by the use of dowel pins or similar devices.
  4. Machined end type racks such as SRCPF and SRCPFD series have the pitch tolerance of – 0.1/- 0.3 for modules less than Module 2.5, and – 0.1/- 0.4 for larger modules. If you try to connect the racks without any space, the pitch at the connection will be too small and will cause problems. Please follow the following diagrams for assembly.

An example of Rack Joining, we recommend the following method.

An example of Rack Joining, we recommend the following method 1

An example of Rack Joining, we recommend the following method 2
[CAUTION] Joining gauge racks for helical racks must have the opposite hand from the racks. Please use Module 1-10 100 racks as a joining gauge rack, or alternatively the rack of the same specifications on hand.

Related links :
Gear Rack – Main page of gear rack