A TOOL TO IMPROVE MACHINE ACCURACY

BY RAJESH MANDLIK

SPINDLE HEALTH CHECK UP

SPINDLE APPLICATION

• MACHINING CENTER SPINDLES• GRINDING SPINDLE• WOOD WORKING SPINDLE• PCB DRILLING/ROUTING SPINDLE• ENGRAVING SPINDLE• DENTAL SPINDLE• GLASS GRINDING SPINDLE• STONE CUTTING SPINDLE• TESTING SPINDLE

TYPES OF MACHINING CENTER SPINDLES

BELT DRIVEN SPINDLE

GEAR DRIVEN SPINDLE

DIRECT DRIVE SPINDLE

TYPICAL BUILT IN MOTOR SPINDLE

SPINDLE HEALTH CHECK UP

• SPINDLE HEALTH CHECK UP: A TOOL TO KEEP AN EYE ON SPINDLE CONDITION AND IN TURN MACHINE ACCURACY

PARAMETERS WHICH AFFECT SPINDLE HEALTH

• BLUE MATCHING OF SPINDLE TAPER• GO-NO GO OF SPINDLE TAPER• BORE RUN OUT• MANDREL RUN OUT NEAR SPINDLE FACE

AND 300 MM/350 MM• RADIAL PLAY/AXIAL PLAY• CLAMPING FORCE• VIBRATION• OVERALL FUNCTIONING OF SPINDLE

BLUE MATCHING• APPLY A BAND OF

BLUE OF 15 MM WIDTH AT 120º

• INSERT GAUGE IN SPINDLE TAPER

• ROTATE SLOWLY AND CHECK SPREAD OF BLUE ON GAUGE

• BEST RESULTS >90%• IF LESS THAN 70%

IMMEDIATE REPAIRS

BORE RUN OUT* BORE RUN OUT

SHOULD BE LESS THAN 5 µ

• BORE RUN OUT IS TO BE CHECKED IN SPINDLE TAPER.

• USE 1 OR 2 µ PEACOCK DIAL

• PLACE DIAL STAND EITHER ON SPINDLE HOUSING OR ON PALLET TABLE.

MANDREL RUN OUT• PLACE MANDREL IN

SPINDLE TAPER. • CHECK THE RUN OUT

NEAR TO SPINDLE FACE AND 300 MM AWAY FROM SPINDLE FACE

• NEAR SPINDLE FACE SHOULD BE LESS THAN 5 µ AND AT 300 MM SHOULD BE LESS THAN 20µ

RADIAL AND AXIAL PLAY• SPINDLE SHOULD BE RIGID RADIALLY

AND AXIALLY • THIS CAN BE CHECKED BY APPLYING

HAND FORCE ON MANDREL.

CLAMPING FORCE

• PLACE THE CLAMP FORCE METER IN SIDE SPINDLE TAPER USING APPROPRIATE ADAPTER

• COMAPRE THE READING WITH CLAMP FORCE GIVEN IN MACHINE MANUAL

VIBRATION• MONITOR VIBRATION LEVEL

PERIODICALLY OF SPINDLE AND EXTERNAL SOURCE AS WELL

• BEST ACCEPTABLE LEVEL <2.25 MM/SEC

OVER ALL FUNCTIONING OF SPINDLE

• CHEECK OVERALL FUNCTIONING OF SPINDLE LIKE NOISE, TEMPERATURE, PROPER COOLING ETC

REPORT

THANK YOU

RAJESH MANDLIKCELL: 9822454204

E MAIL: RajeshM@Setco.com