Service Home How To Procedures Minimum Quantity Lubrication (MQL) - Retrofit Kit - AD0540

Minimum Quantity Lubrication (MQL) - Retrofit Kit - AD0540

Last updated: 04/06/2022

Minimum Quantity Lubrication (MQL) - Retrofit Kit

AD0540

Introduction

This procedure outlines how to upgrade a MQL system built before February 2021 to the current version.

This procedure applies to the following service kits:

  • 93-3518: MQL OIL RESERVOIR ASSEMBLY 2021 SVC KIT

Removal

1

Push [POWER OFF].

Set the main circuit breaker to the OFF position.

Lock the main circuit breaker. Use an approved lock with an approved safety tag.

Close the primary air valve. This stops the air supply to the machine.

2

Remove the oil reservoir [1] from the old assembly.

Disconnect the air and oil tubes from the assembly, then remove the rest of the MQL assembly [2] from the machine.

Installation

1

Remove the reservoir bowl [1] from the MQL oil reservoir assembly.

Attach the toggle valve [2] using the provided pemnuts [3]

Install the new MQL oil reservoir assembly [4].

2

Jog the axes to allow for complete access to all the hardware attaching the upper spindle head cover.

Remove the upper spindle head cover.

Use the 5/32 inch clear oil tube [1] from the original MQL assembly and make sure it is placed through the slot [2] on the spindle head casting.

Cut and remove the rest of the oil tube that is routed to the MQL reservoir. 

Connect the following fittings given in the kit as shown in the image:

  • 5/32 to 1/8 fitting [3]
  • 1/8 to 1/8 fitting [4]
  • 1/8 to 1/4 fitting [5]

Then connect the 5/32 inch oil tube [1] to the fitting [3] after it is feed through the slot [2].

Connect the 1/4 inch oil tube [6] that was given in the kit to the other side of the fitting [5].

 Note: Keep the fittings that connects the clear 1/4" and 5/32" tubes inside the spindle head cover.

3

Route the 1/4 inch oil tube from the connection made in the previous step to the MQL reservoir assembly as shown and connect it to the oil output port [1].

Install the upper cover for the spindle head.

4

Cut a piece of the red 1/4 inch tubing [3] that is routed from the lube panel.

Use the cut piece of the red tubing [1] to connect the valve and elbow fitting as shown. 

Connect the red tubing routed from the lube panel [3] to the air inlet port of the toggle valve [2] on the MQL reservoir assembly.

Start the AAG. Make sure that no leaks are in the system.

Note: Keep the toggle valve in the [OFF] position when the MQL is not in use.

MQL - System Purge

The Minimum-Quantity Lubrication (MQL) system supplies oil to the tool. The MQL system has tubes that supply the oil. Air can get into the tubes. This procedure shows you how to remove the air from the tubes.

Do this procedure at these times:

  1. Before you operate the system for the first time.
  2. After you try to operate the system with the oil reservoir empty.
  3. After you change fluids.

1

Fill the oil reservoir with MQL lubricant [1].

Install the reservoir [2] into MQL Reservoir assembly.

Caution: Only use lubricants that are non-toxic and specially made for MQL systems. Refer to the Lubricant Table for Haas Machine Components for recommended lubricants.

2

Find the atomizer needle valve [1]. Turn the needle valve counterclockwise (2) full turns from the closed position.

Operate this code in MDI mode:

M83;

Operate the MQL system [2] until no air is in the system. The mist can stop momentarily. This shows that air is in the system. If the mist does not stop, no air is in the system.

Push [RESET] to cancel the purge cycle.

3

Close the atomizer needle valve. Then open it (1/2) to (1) turn.

Do these steps to make sure the MQL system operates correctly: Hold a small piece of paper approximately 3 inches from the atomizer. Operate the program in Step 2. A round wet pattern shows that the MQL system is adjusted correctly.

Some oils have a higher viscosity. Oils with higher viscosity flow slowly. To make the oil flow correctly, adjust the needle valve.

Note: If the oil is not flowing through, remove the needle valve and its spring to clean it off and let it run until oil starts leaking through the needle valve hole. Put back the needle valve and its spring, and close it. Then open it (1/2) to (1) turn and try again.

Do not use more than the necessary quantity of oil. The necessary quantity prevents these problems:

  • Chips attach to the tool.
  • Chips attach to the workpiece.

4

If the pressure of the oil mist from the spray head is not sufficient, make sure no kinks are in the oil tube.

If no kinks are in the oil tube, the filter is possibly clogged. The filter is inside the reservoir. Refer to the Minimum Quantity Lubrication (MQL) - Filter Maintenance procedure.