VMC - Spindle - Taper - Maintenance

Applies to machines built from: 
February, 2014

VMC - Spindle - Taper - Maintenance

The spindle taper is the area inside of the spindle. A spindle taper that is dirty, damaged, or not aligned decreases cutting accuracy and causes an unsatisfactory surface finish.

Press EMERGENCY STOP before you do any of these procedures.

Do these steps monthly**:

  • Use a flashlight to visually inspect the spindle taper for signs of wear and damage.
  • Clean the spindle taper with a clean, lint-free cloth.
  • Put a coat of all-purpose machine oil on the spindle taper with a lightly-oiled lint-free cloth.

Tools Required:

Clean Lint-Free Cloth Flashlight Precision Test Bar
All-Purpose Machine Oil 0.0001" Dial Indicator Non-Drying High-Spot Paste

Do these steps monthly, or when needed:

  • Put the tip of an indicator [1] against the taper to measure runout. Manually turn the spindle. The total indicated runout (TIR) of the spindle at the taper must not exceed 0.0002" (0.005 mm).
  • Put a precision test bar [2] into the spindle. Put the tip of the indicator against the test bar approximately 6.0"(150 mm) below the gauge line to measure runout. The TIR at 6.0"(150 mm) from the gauge line must not exceed 0.0005" (0.013 mm).
  • Put a coat of blue high-spot paste over the entire surface of the taper of a toolholder. Put the toolholder into the spindle.
  • Remove the toolholder. The fit into the taper is correct when at least 75% of paste [3] has been rubbed off. Make sure that the pull stud is not damaged.

Refer to Mill - Tooling - Maintenance. Do the VMC - Spindle - Drawbar - Force Measurement.

note: Best practice is to remove toolholders from the spindle when the machine is not in operation.

**The recommended times are based on the average user. Actual times vary depending on machine usage and the materials being cut. If you machine abrasive materials such as graphite or cast iron, or if you run the machine the machine on multiple shifts per day, the inspections should be more frequent. Likewise, if the machine is rarely used, then the intervals between inspections can be longer.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.