Embed Size (px)
Citation preview
LAST UPDATED: 11/27/2018
Spindle - Drawbar - Troubleshooting Guide
Introduction
1. Drawbar2. Toolholder3. Retention balls4. Pull stud5. Belleville springs
Spindle - Drawbar - Troubleshooting Guide
Page 1 of 5 pages
Symptom Table
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
The toolholder frets in the taper. The tool pulls out of the taper. Check for damaged Bellevillespring washers.
The part has a poor finish. The tool length is too long. Refer to the toolmanufacturer's specifications.
The toolholder drops before the toolchanger can grab it.
The clamp force on the toolholder is toolow, or the TRP pre-charge is not setcorrectly.
Check the clamp force andpre-charge air pressure.
(TSC Only) Excessive coolant comes outof the coolant tube behind the spindle.
The carbide insert on the drawbar isdamaged.
Check the carbide insert in thedrawbar and TRP for damage.
The pull stud angle is pitted or damaged. Check the pull stud fordamage.
The TRP sensor(s) are not aligned. Align the tool release pistonsensor(s).
The air pressure or volume to the TRP is toolow.
Check the air pressure andvolume.
The drawbar does not release thetoolholder smoothly.
The drawbar retaining balls are dry. Apply RED-i grease to theretaining balls.
Toolholder makes a "popping" noisewhen it is released. The toolholder and spindle taper are dirty. Clean the taper.
Toolholder Is Fretting
Corrective Action:
Verify that the tool length, axis feed, and spindleRPM are correct according to the toolingmanufacturer's recommendations.
Spindle - Drawbar - Troubleshooting Guide
Page 2 of 5 pages
Drawbar Force
Belleville Springs
Carbide Insert (TSC Only)
Corrective Action:
Check the clamp force with a clamp forcemeasuring tool and refer to the DRAWBAR FORCEREFERENCE TABLE. If the pull force is low, thedrawbar is faulty.
Corrective Action:
If the Belleville springs on your drawbar aredamaged, you must replace the drawbar. Thedrawbar in inline spindles cannot be removed. Ifthe drawbar in an inline spindle is damaged, youmust replace the entire spindle assembly.
Refer to the tool release piston pre-chargeadjustment procedure: VMC - 30/40-TAPER -TOOL RELEASE PISTON - PRE-CHARGE -ADJUSTMENT
Corrective Action:
Remove the toolholder from the spindle. Checkfor damage to the pull stud. The pull stud musthave a 45° angle [1].
Ball marks on the edge of the pull stud indicatethat the drawbar does not open completely.
Refer to the TRP CLAMP/UNCLAMP SENSORADJUSTMENT procedure.
Spindle - Drawbar - Troubleshooting Guide
Page 3 of 5 pages
TRP Sensor(s)
Air Pressure
Lubrication
Corrective Action:
Refer to the TRP CLAMP/UNCLAMP SENSORADJUSTMENT procedure.
Corrective Action:
Verify that the air pressure to the TRP solenoid [1]is 90-psi (6.21 bar).
If the volume is correct, there should be only a10-psi (0.69 bar) air pressure drop during a toolchange. Use an inline air gauge to measure thechange in air pressure.
Check for kinks or splits in the air hose that goesto the TRP assembly [2].
Make sure the volume of air supplied to themachine is sufficient. Refer to NEW MACHINESETUP/PRE-INSTALLATION.
Corrective Action:
To grease the retaining balls, put a ball of RED-igrease on top of a pull stud.
Put the toolholder into the spindle. Clamp andunclamp (4) or (5) times to load the grease ontothe retaining balls.
Remove the toolholder. Wipe excess grease fromthe toolholder and spindle taper.
Spindle - Drawbar - Troubleshooting Guide
Page 4 of 5 pages
Contamination
Corrective Action:
Clean the toolholders and spindle taper. Checkfor damaged toolholders before you put themback in the machine. A damaged toolholder cancause damage to the spindle taper and createtool runout or problems with finish.
Spindle - Drawbar - Troubleshooting Guide
Page 5 of 5 pages
