Machine Maintenance¶

Following the recommended maintenance intervals and procedures will help to ensure the longevity and performance of your PRO CNC or Benchtop PRO machine. Intervals listed are based on an average of 20hr/week of machine use.

Greasing Supplies¶

Your PRO CNC machine kit includes a mini grease gun and tube of bearing grease. Additional greasing supplies are available on our website:

• Mini Grease Gun
• Needle Tip Adapter
• Mutli-Purpose Lithium Grease

How to assemble your grease gun

How to Assemble Your Grease Gun (https://youtu.be/lxhAlXvcLXc)

Ballscrew & Linear Rail Greasing¶

We recommend greasing the ballscrew axis and linear bearing blocks on your machine every 3 months. The videos below provide instructions for this procedure. Choose the appropriate video, based on the purchase date of your machine.

PRO CNC machines purchased after April 2019

How to Grease Your Post-April 2019 Avid CNC Machine (https://youtu.be/7l7KrTH4QvI)

PRO CNC machines purchased prior to April 2019

How to Grease Your Pre-April 2019 Avid CNC Machine (https://youtu.be/joaFOifkMI4)

Gear Rack Greasing¶

Gear rack on the PRO CNC table axis and gantry axis can be greased with either a dry teflon lube (every 3 months) or a multi-purpose lithium grease (every 6 months). If your machine is operated in a dusty environment, it is recommended to use dry teflon lube.

Component Replacement¶

PRO Rack and Pinion Drive 2.0 Gear Set

The PRO Drive 2.0 system uses an improved version of the drive gear (PRO Drive Gear Set) and is a drop-in replacement for our legacy component (PRO Roller Drive Spindle).

The new version is backward compatible with legacy PRO Rack and Pinion Drives but features a replaceable Drive Gear Cartridge with an integrated double-row ball bearing. The new design reduces the cost of future replacements by allowing you to reuse your aluminum drive pulley and gear set shaft.

Gear Set Identification

PRO Drive 2.0 Gear Set User removable Drive Gear Cartridge Cartridge fastened from the back with 3 screws Bearing is press fit into the Cartridge	Legacy PRO Roller Drive Spindle No user removable components Drive gear is press fit in place at factory Bearing is press fit into the assembly

Spare Parts

There are only a few mechanical parts that should ever need to be replaced on your PRO CNC machine. It can be helpful to have these on hand to avoid machine downtime in the event of a machine crash or other issue.

PRO CNC Machine Spare Parts Bundles featuring PRO Drive 2.0 replaceable Drive Gear Cartridges are available for both Stepper and Servo systems.

Instructions¶

Tools List

Assembly Removal¶

Step 1

1. Unthread and remove the M8 x 90mm Hex Cap Screw C, M8 Flat Washer D, and Die Spring E.

Step 2a

1. Remove the 3/8-16 x 2" Socket Head Cap Screw N and Pivot Spacer O.
2. Remove the Rack and Pinion Drive assembly from the machine.
3. Remove the Pivot Bushing P from the bearing.

Step 2b

1. Loosen the set screw on the Eccentric Collar Bearing Cap K.
2. Remove the Pivot Shaft J and Eccentric Collar Bearing Cap K.
3. Remove the Rack and Pinion Drive assembly from the machine.

Step 3

1. Loosen the M6 x 22mm Socket Head Cap Screw H to disengage the Cam Tensioner I.

Step 4

1. Loosen but do not remove the four Socket Head Cap Screws G.
2. Slide the motor towards the pulley to remove belt tension.

Step 5

1. Remove the Drive Belt B.
2. If the belt shows signs of damage to the tension cords, replace with a new belt at this time.

Gear Replacement¶

Step 1a

1. Remove the Gear Set Q, including the Gear Set Shaft L and Gear Set Spacer M.

Step 1b

1. Remove the PRO Spindle Assembly N and the 5/16" Flat Washer O.
2. If your replacement Gear Set is already assembled, skip to Step 6.

Step 2

1. Remove the three M4 x 14mm Socket Head Cap Screws S.
2. Remove the Drive Gear Cartridge A from the Drive Pulley R.

Step 3

1. Clean any oil from the interface surfaces of the new Drive Gear Cartridge A and existing Drive Pulley R.

Step 4

1. Slip the new Drive Gear Cartridge A into the Drive Pulley R.
2. Install the three M4 x 14mm Socket Head Cap Screws S.

Step 5

1. Torque the three M4 x 14mm Socket Head Cap Screws S to 4.3 Nm (38 in-lb).

Step 6

1. Attach the Gear Set Q to the Rack and Pinion Drive Plate using the Gear Set Shaft L and Gear Set Spacer M.

Step 7

1. Fully tighten the Gear Set Shaft L.

Reassembly and Installation

See the Rack and Pinion Drive section of your machine revision assembly instructions to reassemble and install the Rack and Pinion drive.