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Section 4: Rack and Pinion Drive

CRP4848_RP_001

4.1 Rack and Pinion Assembly (NEMA 23)

CRP4824_RP_002

Section Note

Skip to Section 4.2 if you are using a NEMA 34 electronics package.


Parts and Tools Required

The following bags and parts will be used in this section:

  • (3) NEMA 23 Stepper Motor
  • (3) CRP201-09 NEMA 23 R&P Motor Pulley
  • (3) NEMA 23 R&P Drive Plate
  • (3) CRP203-00 NEMA 23 Standard Drive Spindle
  • (3) CRP201-00-FAST-02-17.2
    • (3) 3/8" Washer
    • (3) 1" x 0.5" Shoulder Bolt
    • (3) NEMA 23 R&P Drive Belt
    • (12) 10-32 x 5/8" Socket Head Cap Screw
    • (12) 10-32 Hex Nut

The following tools will be used in this section:

  • 3/32" Allen Wrench
  • 5/32" Allen Wrench
  • 1/4" Allen Wrench
  • Tape Measure

4.1.1 Motor Assembly


4.1.1.1

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  • Remove tape on motor shaft.
  • Loosen motor pulley set screws.
  • Install motor pulley on motor shaft as indicated.

Assembly Note

Ensure keyway is fully seated in slot on motor shaft to allow easy installation of the motor pulley.


4.1.1.2

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  • Position motor pulley to dimension shown.
  • Tighten indicated set screws. Red Arrows

4.1.2 Drive Plate Assembly


4.1.2.1

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  • Install spindle on drive plate as indicated.
  • Fully tighten shoulder bolt.

Assembly Note

Ensure the drive spindle is installed on the correct side of the drive plate. The spindle will be on the same side as the recessed nut slots, as shown in the above figure.


4.1.2.2

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  • Place the motor on the drive plate as indicated.

4.1.2.3

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  • Install drive belt on motor pulley and drive spindle as indicated.

4.1.2.4

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  • Orient motor with the cable in the position indicated by the red arrow.

4.1.2.5

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  • Insert motor fasteners as indicated.

Assembly Note

Do not tighten these fasteners prior to adjusting the belt tension in the following step.


4.1.2.6

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  • Tension belt by applying pressure to motor in the indicated direction.
  • Keep this pressure on the motor and tighten the 10-32 x 5/8" motor screws.

4.1.2.7

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  • Use this process to assemble three R&P Assemblies.

Assembly Note

Orient each motor with the cables in the position indicated by the red arrows.


4.2 Rack and Pinion Assembly (NEMA 34)

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Assembly Note

Skip to Section 4.3 if you are using a NEMA 23 electronics package.


Parts and Tools Required

The following bags and parts will be used in this section:

  • (3) NEMA 34 Stepper Motor
  • (3) CRP301-03 NEMA 34 Motor Pulley
  • (3) NEMA 34 R&P Drive Plate
  • (3) CRP303-00 NEMA 34 Standard Drive Spindle
  • (3) CRP301-00-FAST-17.2
    • (3) 0.020" Shim
    • (3) 1.25" x 0.5" Shoulder Bolt
    • (3) NEMA 34 R&P Drive Belt
    • (12) 1/4-20 x 3/4" Socket Head Cap Screw
    • (12) 1/4-20 Hex Nut

The following tools will be used in this section:

  • 3/32" Allen Wrench
  • 3/16" Allen Wrench
  • 1/4" Allen Wrench
  • Tape Measure

4.2.1 Motor Assembly


4.2.1.1

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  • Remove tape on motor shaft.
  • Loosen motor pulley set screws.
  • Install motor pulley on motor shaft as indicated.

Assembly Note

Ensure keyway is fully seated in slot on motor shaft to allow easy installation of motor pulley.


4.2.1.2

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  • Position motor pulley to dimension shown.
  • Tighten set screws as indicated. Red Arrows

4.2.2 Drive Plate Assembly


4.2.2.1

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  • Install spindle on drive plate as indicated.
  • Fully tighten shoulder bolt.

Assembly Note

Ensure the drive spindle is installed on the correct side of the drive plate. The spindle will be installed on the recessed portion, as shown in the above figure.


4.2.2.2

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  • Place the motor on the drive plate as indicated.

4.2.2.3

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  • Install drive belt on motor pulley and drive spindle as indicated.

4.2.2.4

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  • Orient motor with the cable in position indicated by the red arrow.

4.2.2.5

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  • Insert motor fasteners as indicated.

Assembly Note

Do not tighten these fasteners prior to adjusting the belt tension in the following step.


4.2.2.6

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  • Tension belt by applying pressure to motor in the indicated direction.
  • Keep this pressure on the motor and tighten the 10-32 x 5/8" motor screws.

4.2.2.7

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  • Use this process to assemble three R&P Assemblies.

Assembly Note

Orient each motor with the cables in the position indicated by the red arrows.


4.3 Rack and Pinion Installation

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Parts and Tools Required

The following bags and parts will be used in this section:

  • (3) CRP201-00-FAST-02-17.2 (NEMA 23 Applications)
    • (3) 0.005" Shoulder Bolt Shim
    • (3) 1/2" x 1/2" Shoulder Bolt
  • (3) CRP301-00-FAST-17.2 (NEMA 34 Applications)
    • (3) 0.005" Shoulder Bolt Shim
    • (3) 3/4" x 1/2" Shoulder Bolt
  • (3) CRP201-00-TEN-17.2
    • (3) M8 x 10mm Hex Cap Screw
    • (3) M6 x 12mm Flat Head Screw
    • (3) R&P Tensioner Bracket
    • (3) R&P Tension Post
    • (3) M8 x 100mm Socket Head Cap Screw
    • (6) M8 Flat Washer
    • (3) Die Spring

The following tools will be used in this section:

  • 1/4" Allen Wrench
  • 4mm Allen Wrench
  • 6mm Allen Wrench
  • 13mm Combination Wrench

Section Note

For NEMA 23 applications, continue to Section 4.3.1

Section Note

For NEMA 34 applications, skip to Section 4.3.2


4.3.1 R&P Assembly Installation (NEMA 23)

CRP4848_RP_034

Assembly Note

In the following steps, use the appropriate R&P Assembly to position the motor cables as indicated by the red arrows.


4.3.1.1

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  • Attach an R&P Assembly to the linear carriage as indicated.

4.3.1.2

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  • Repeat the process on the opposite side of the machine.

Assembly Note

When installing R&P Assemblies, ensure correct orientation with the drive spindles towards the rear of the machine.


4.3.1.3

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  • Attach the third R&P Assembly to the gantry's top linear carriage as indicated.

Section Note

Now skip to Section 4.3.3 to install the R&P Tensioners


4.3.2 R&P Assembly Installation (NEMA 34)

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Assembly Note

In the following steps, use the appropriate R&P Assembly to position the motor cables as indicated by the red arrows.


4.3.2.1

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  • Attach an R&P Assembly to the linear carriage as indicated.

4.3.2.2

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  • Repeat the process on the opposite side of the machine.

Assembly Note

When installing R&P Assemblies, ensure correct orientation with the drive spindles towards the rear of the machine.


4.3.2.3

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  • Attach the third R&P Assembly to the gantry's top linear carriage as indicated.

4.3.3 R&P Tensioner Installation

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Section Note

This section is applicable to both NEMA 23 and NEMA 34 applications


4.3.3.1

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  • Install R&P Tensioner Bracket and Tension Post as indicated.
  • Partially tighten fasteners.

4.3.3.2

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  • Install tensioner screw as indicated and hand tighten.
  • Tighten R&P Tension Bracket M8 x 10mm fastener.

4.3.3.3

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  • Partially remove the tension screw as indicated.
  • Tighten R&P Tension Post fastener indicated by the red arrow.

4.3.3.4

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  • Hand tighten tension screw until finger tight.
  • Set initial R&P tension by tightening tension bolt three additional turns.

4.3.3.5

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  • Repeat the process to install tensioners on the remaining two R&P Assemblies.