Axial and Radial Runout Analysis

Axial Runout

• This occurs when the magnet is not parallel and tilted relative to the shaft axis.

Radial Runout

• This occurs when the magnet deviates from the shaft's center line but remains parallel to the shaft axis.

Runout Analysis

• Magnet runout charts in MES are insufficient for analyzing axial and radial runout.
• Axial and radial component charts are preferred for analyzing runout before machine adjustments.

Contributors to Axial and Radial Runout

• Gripper contamination from hardened glue or foreign debris
• A worn gripper
• A loose magnet gripper
• Magnet cylinder gripper actuation that is not smooth or is sluggish
• Loose X/Y table locks
• Loose leveling screw and locks
• X/Y table drift
• Glue not cured by UV light
• Insufficient glue between the shaft and magnet

Conditions for Good Magnet Gripper Runout

• The gripper must be clean.
• The gripper screws must be tightened.
• The gripper cylinder must move smoothly, without sluggishness.
• The magnet gripper jaw must not be damaged.

Leveling and Tightening XY Magnet Holder Stage Screws

• A good gap is visibly even.
• A bad gap is visibly uneven.
• Loosening the three leveling screws until all sides have zero gap corrects the issue
• Leveling adjustments require ensuring leveling screws push the plate with downward counterforce.
• Tightening requires ensuring the three leveling screws hold the plate while applying downward counterforce by hand.
• Fine adjustments should be made during leveling and tightening, with outcomes checked using a digital leveling gauge.

Axial Adjustment Using Alignment Jig

• Mount a digital gauge plate to the bearing clamp
• Ensure the jig is firmly gripped by the clamp and place the digital gauge on the jig plate.
• Record the tilting angle
• Mount the digital gauge plate to the magnet chuck, repeating gripper closing/opening to ensure a firm grip on the jig plate
• Place the digital gauge on the plate and record the tilting angle.
• Adjust magnet leveling until the tilting angle matches the bearing clamp angle.
• Ensure proper leveling and screw tightening
• Remove the bearing and magnet jig plate and install the alignment jig to the bearing clamp and magnet chuck.
• Loosen and free the X/Y table
• Insert the shaft pin jig into the bearing clamp and slide it through the magnet chuck jig.
• Adjust the X/Y table micrometers until the shaft jig pin passes smoothly into the magnet jig, avoiding force.
• When the shaft jig pin moves smoothly up and down to the magnet chuck jig, slowly tighten the X/Y table lock, avoiding overtightening to prevent twisting or deviating X/Y linearity.
• Verify smooth shaft jig pin movement up and down to the magnet jig after tightening.
• After alignment, remove all jigs from the bearing and magnet chuck and proceed with part verification.

Radial Runout Figures A and B

• Figure A requires adjusting x and y by microns with the peak between +X and +Y coordinates.
• Figure B requires adjusting x by microns, with the peak at the -X axis coordinate.

Radial Runout Adjustment

• Mount the dial gauge aligned to the adjustment axis and touch the probe tip to the mechanical axis of movement.
• Positive deflection occurs when movement is toward the dial gauge probe tip.
• Negative deflection occurs when movement is away from the dial gauge probe tip.
• Record the dial gauge reading before loosening the X/Y table lock.
• Loosen the lock and hard stop nut of the X or Y axis and carefully check the dial gauge reading.
• Slowly adjust the micrometer and hard stop of X or Y until reaching the desired value shown on the dial gauge reading.
• Ensure the hard stop and micrometer do not push each other excessively and slowly tighten both hard stop nuts and X/Y hand locks.
• Verify runout using production parts.

Recommendation for Combined Runout

• If both radial and axial runout are present, adjust axial runout first, followed by radial runout alignment.

Causes of Magnet Length Issues

• Magnet holder contamination from hardened glue or foreign material
• Shifted robot pick position causing the part to be lower when placed on the bearing clamp
• Pallet height variations or wear, causing the part to be lower
• Incorrect height robot teaching at the pallet pick position
• Magnet jumping during the open/close of the magnet chuck gripper
• Insufficient UV curing

Actions to Recover Magnet Length

• Clean the magnet holder.
• Check the pick position from the pallet and the place position to the inserter bearing clamp.
• Check for pallet traceability issues related to magnet length.
• Verify all robot teaching points and demagnetize the gripper chuck.
• Verify UV alignment and intensity.