Mazak CNC Machine OTN 250MS

Remove nuts A and B and remove the sensor

Insert a new sensor into the hole of the bracket

Tightening torque at section A: 11.8 N#m (8.7 ft#lbs)

Tightening torque at section B: 19.6 N#m (14.5 ft#lbs)

Measure the clearance between the front end of the sensor and the watchdog

Perform adjustments for a clearance of 0.3 - 0.5 mm (0.01 - 0.02 in.) between the front end of the sensor and the watchdog

To move the sensor forward through 1 mm (0.04 in.): Rotate (loosen) nut A through one counterclockwise turn and Rotate (tighten) nut B through one clockwise turn

To move the sensor backward through 1 mm (0.04 in.): Rotate (loosen) nut B through one counterclockwise turn and Rotate (tighten) nut A through one clockwise turn

Warning: This procedure requires trained personnel with PPE!

Is the greasing pump unit functioning properly?

Enter the hours since the last lubrication

Is the lubricating oil supplied automatically every 30 hours?

Is the lubricating oil supplied automatically with each start of the milling spindle?

Sign off on the X- And Z-Axes Lubrication

Inspection when starting hydraulic unit

Check that the pressure is set to 5 MPa (712 PSI)

Inspection and maintenance of hydraulic unit

CAUTION: When replenishing the hydraulic unit with oil, use only the recommended oil.

Replenish the hydraulic oil when the oil level gauge float is below the center

Replacing the hydraulic oil and cleaning the strainer

CAUTION: Hydraulic oil may be warmed up to high temperature after the continuous operation. Care should be taken not to be get burnt.

Place a container with a capacity of 30 liters (7.93 gal (US)) or so underneath the drain outlet

The tailstock is driven by a servomotor via a ball screw. A guide bushing made of resin is mounted at the leading end of the ball screw, and the inside diameter of the pipe connected to the tailstock serves as the guideway for the tailstock to move.

The guide bushing is lubricated with grease and requires checking and regreasing every six months. If unusual operating sounds arise from guide bushing wear, the bushing also needs to be replaced.

1. Checking and regreasing the ball screw guide bushing

(1) Move the tailstock to its minus side and then remove the front cover of the tailstock.

(2) Slide the front cover to the left until the connection between the ball screw and the pipe has come into sight.

(3) Move the tailstock to its home position.

(4) Apply grease to the guide bushing exposed between the supporter and pipe at the connection of the ball screw.

(5) Move the tailstock to its minus side and then remount the front cover.

Note: For recommended grease refer to Subsection 5-6-4.

1. Inspecting the lubrication unit of the slideway section

A. Inspecting the lubricating oil amount

Before starting the machine every day, check that the lubricating oil reserve tank is filled with the specified lubricating oil to the specified level.

If the oil level is lower than the center of the upper/lower level line of the level gauge at the tank side, supply the same brand of lubricating oil from the oil filter port on the upper part of the lubrication unit so that the oil level do not exceed the upper limit level line.

B. Cleaning and changing the filter

The suction filter in the automatic intermittent lubricating pump can be removed by taking off the screws of the upper part of the pump. The filter on the oil filler port can be removed in the same manner. Clean the filters once in a year.

Before starting the day’s operation, check every lubricating status of the lubricating parts. Shortage of oil in the lubricating parts causes clogging of the flow unit and oil leakage from the piping route.

Entry of foreign particles like chips into the flow unit causes clogging and malfunction of the flow unit. In such a case, replace the flow unit.