Section 4: Rack and Pinion Drive¶
4.1 NEMA 23 Drive Assembly¶
Section Note
Section Note
Parts and Tools Required¶
| QTY | Part/Description | Packaged In |
|---|---|---|
| 3 | NEMA 23 Motor | Electronics |
| 3 | CRP201-09 - NEMA 23 Motor Pulley | CRP320-00-S375-19.1 |
| 3 | R&P Drive Plate | CRP320-00-S375-19.1 |
| 3 | CRP325-00 - PRO NEMA 23 Spindle Assembly | CRP320-00-S375-19.1 |
| 3 | CRP320-00-FAST-375-19.1 | CRP320-00-S375-19.1 |
| (4) M5 x 14mm Socket Head Cap Screw (Total QTY: 12) | ||
| (4) M5 Hex Nut (Total QTY: 12) | ||
| (1) NEMA 23 R&P Drive Belt (Total QTY: 3) | ||
| (1) 5/16" Flat Washer (Total QTY: 3) | ||
| (1) M6 x 22mm Socket Head Cap Screw (Total QTY: 3) | ||
| (1) Cam Tensioner (Total QTY: 3) | ||
| Remaining parts from this kit used in Section 4.3 |
Note: The fastener kit part number listed above is applicable for NEMA 23's with the default 3/8" shaft. If you purchased the 1/4" shaft version, your fastener kit part number will be CRP320-00-FAST-250-19.1 and your Rack & Pinion Drive parts will be located in the box labeled CRP320-00-S250-19.1.
- Required Tools:
- 3/32" Allen Wrench
- 1/4" Allen Wrench
- 4mm Allen Wrench
- 5mm Allen Wrench
- Adjustable Wrench
- Tape Measure
- Recommended Additional Tools:
- 16mm Combination Wrench
4.1.1 Motor Assembly¶
4.1.1.1¶
- Slide the motor pulley onto the motor shaft as indicated.
Assembly Note
Ensure the motor keys are installed into the shaft prior to installing the pulley. Motor keys will either be pre-installed or included in a small bag.
4.1.1.2¶
- Adjust the motor pulley such that the top of the pulley is 28mm (1-3/32") from the motor flat.
4.1.1.3¶
- Apply blue thread locker to the set screws. (Not Included)
- Fully tighten the set screws.
Assembly Note
Do not over tighten, but ensure fasteners are completely seated.
4.1.2 Drive Plate Assembly¶
4.1.2.1¶
- Carefully set hex nuts in the indicated slots.
4.1.2.2¶
- Attach the motor to the R&P plate as indicated.
- Partially tighten the fasteners.
Assembly Note
Orient the motor with the cable pointing towards the R&P drive plate bearing cup.
4.1.2.3¶
- Attach the drive spindle to the R&P plate as indicated.
Assembly Note
Your spindle may have the shaft installed in the spindle already, held in place with a plastic hex nut for protection during shipping. The plastic hex nut needs to be removed prior to installing the spindle.
4.1.2.4¶
- Tighten the drive spindle shaft.
4.1.2.5¶
- Slide the drive belt around the motor pulley and drive spindle.
Assembly Note
It may be necessary to slide the motor closer to the drive spindle as indicated.
4.1.2.6¶
- Attach the tensioner cam to the R&P drive plate as indicated.
4.1.2.7¶
- Use a 16mm wrench to turn the tensioner cam against the motor.
4.1.2.8¶
- Hold the tensioner cam against the motor to generate belt tension.
Assembly Note
The belt should be tight enough such that the belt cannot be squeezed more than 3mm (1/8") with your fingers.
4.1.2.9¶
- With the belt tensioned, fully tighten the cam tensioner and motor fasteners.
4.1.2.10¶
- Repeat this process to assemble three R&P drive assemblies.
4.2 NEMA 34 Drive Assembly¶
Section Note
Section Note
Parts and Tools Required¶
| QTY | Part/Description | Packaged In |
|---|---|---|
| 3 | NEMA 34 Motor | Motors |
| 3 | CRP301-03 - NEMA 34 Motor Pulley | CRP320-00-S500-19.1 |
| 3 | R&P Drive Plate | CRP320-00-S500-19.1 |
| 3 | CRP324-00 - PRO NEMA 34 Spindle Assembly | CRP320-00-S500-19.1 |
| 3 | CRP320-00-FAST-500 | CRP320-00-S500-19.1 |
| (4) M6 Hex Nut (Total QTY: 12) | ||
| (1) NEMA 34 R&P Drive Belt (Total QTY: 3) | ||
| (1) 5/16" Flat Washer (Total QTY: 3) | ||
| (5) M6 x 22mm Socket Head Cap Screw (Total QTY: 15) | ||
| (1) Cam Tensioner (Total QTY: 3) | ||
| Remaining parts from this kit used in Section 4.3 |
- Required Tools:
- 3/32" Allen Wrench
- 1/4" Allen Wrench
- 5mm Allen Wrench
- Adjustable Wrench
- Tape Measure
- Recommended Additional Tools:
- 16mm Combination Wrench
4.2.1 Motor Assembly¶
4.2.1.1¶
- Slide the motor pulley onto the motor shaft as indicated.
Assembly Note
Ensure the motor keys are installed into the shaft prior to installing the pulley. Motor keys will either be pre-installed or included in a small bag.
4.2.1.2¶
- Adjust the motor pulley such that the top of the pulley is 35mm (1-3/8") from the bottom of the motor flat.
4.2.1.3¶
- Apply blue thread locker to the set screws. (Not included)
- Fully tighten the set screws.
4.2.2 Drive Plate Assembly¶
4.2.2.1¶
- Carefully set hex nuts in the indicated slots.
4.2.2.2¶
- Attach the motor to the R&P plate as indicated.
- Partially tighten the fasteners.
Assembly Note
Orient the motor with the cable pointing towards the R&P drive plate bearing cup.
4.2.2.3¶
- Attach the drive spindle to the R&P plate as indicated.
Assembly Note
Your spindle may have the shaft installed in the spindle already, held in place with a plastic hex nut for protection during shipping. The plastic hex nut needs to be removed prior to installing the spindle.
4.2.2.4¶
- Tighten the drive spindle shaft.
4.2.2.5¶
- Slide the drive belt around the motor pulley and drive spindle.
Assembly Note
It may be necessary to slide the motor closer to the drive spindle as indicated.
4.2.2.6¶
- Attach the tensioner cam to the R&P drive plate as indicated.
4.2.2.7¶
- Use a 16mm wrench to turn the tensioner cam against the motor.
4.2.2.8¶
- Hold the tensioner cam against the motor to generate belt tension.
Assembly Note
The belt should be tight enough such that the belt cannot be squeezed more than 3mm (1/8") with your fingers.
4.2.2.9¶
- With the belt tensioned, fully tighten the cam tensioner and motor fasteners.
4.2.2.10¶
- Repeat this process to assemble three R&P drive assemblies.
4.3 R&P Drive Installation¶
Section Note
Parts and Tools Required¶
| QTY | Part/Description | Packaged In |
|---|---|---|
| 3 | CRP320-00-TEN-19.1 | CRP320-00-SXXX-19.1 |
| (1) R&P Tension Post (Total QTY: 3) | ||
| (1) R&P Tension Bracket (Total QTY: 3) | ||
| (1) M6 x 12mm Flat Head Screw (Total QTY: 3) | ||
| (1) M8 x 14mm Hex Cap Screw (Total QTY: 3) | ||
| (1) M8 x 90mm Hex Cap Screw (Total QTY: 3) | ||
| (2) M8 Flat Washer (Total QTY: 6) | ||
| (1) Die Spring (Total QTY: 3) | ||
| 3 | CRP320-00-FAST-XXX | CRP320-00-SXXX-19.1 |
| (1) Eccentric Collar Bearing Cap (Total QTY: 3) | ||
| (1) Pivot Shaft (Total QTY: 3) |
- Required Tools:
- 1/4" Allen Wrench
- 3mm Allen Wrench
- 4mm Allen Wrench
- 6mm Allen Wrench
- Adjustable Wrench
- Tape Measure
- Recommended Additional Tools:
- 13mm Combination Wrench
4.3.1 Table R&P Drive¶
4.3.1.1¶
- Attach the tension post to the R&P plate as indicated.
- Partially tighten the fastener.
4.3.1.2¶
- Attach the tension bracket to the riser plate as indicated.
- Partially tighten the fastener.
4.3.1.3¶
- Attach the R&P assembly to the riser plate as indicated.
Assembly Note
Ensure the eccentric collar bearing cap is oriented correctly. It will fit over the eccentric collar bearing pre-installed in the R&P Drive Plate.
4.3.1.4¶
- Ensure the R&P assembly is fully seated on the riser plate as indicated.
4.3.1.5¶
- Fully tighten the pivot shaft.
Assembly Note
There will be a gap between the head of the pivot shaft and the eccentric collar bearing, as shown by the arrow.
4.3.1.6¶
- While pushing in on the eccentric collar cap, rotate it in the clockwise direction until the bearing starts rotating inside the R&P plate.
- Hold the eccentric collar cap in this position while proceeding to the next step.
4.3.1.7¶
- Tighten the set screw on the side of the eccentric collar bearing.
4.3.1.8¶
- Install the tension bolt, washers, and spring as indicated.
Assembly Note
Only thread the bolt through the first hole of the tension post.
4.3.1.9¶
- Tighten the tension post fastener.
4.3.1.10¶
- Continue threading in the tension bolt until the spring is seated, but not compressed.
- Fully tighten the tension bracket fastener.
4.3.1.11¶
- Tighten the tension bolt 3 revolutions to tension the R&P Assembly.
4.3.1.12¶
- Repeat this process on the other side of the machine.
4.3.2 Gantry R&P Drive¶
4.3.2.1¶
- Repeat the previous steps to install an R&P drive assembly on the gantry.
Assembly Note
You can use a clamp to hold the R&P assembly level while adjusting the eccentric collar bearing.
4.3.2.2¶
- Follow the same procedure as the table R&P drive to install the R&P tensioner on the gantry.
Assembly Note
Ensure the tensioner bracket is in the correct orientation, as depicted above.