| Fault findingRTP20CAUTION: RTP20 is designed for automated operation under direct control of the CMM software. To avoid possible collision during use, RTP20 must not be unlocked, re-orientated or locked by hand during normal operation. Poor measuring performancePossible causes | Remedy |
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Loose mounting | Ensure shank mounting screws are tight and mounting to CMM is secure. | Problem with TP20 probe module | Diagnosis of the probe unit should be carried out with axes correctly locked an without head adjustment between probe points. | Problem with swivelling / indexing unit | Diagnosis of the indexing unit should only be carried out following satisfactory probe performance. |
No probe signal and / or no probe status LEDPossible causes | Remedy |
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Cable faulty / not connected | Check continuity of cabling from head to interface / machine control. | Probe interface faulty / not connected | Ensure correct connection of interface / machine control. |
Poor repeatability (RTP20 only)Possible causes | Remedy |
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Axes lock procedure incorrect | Using automated cycle ensure lock lever is fully rotated to lock position. | Axes unlock procedure incorrect | Using automated cycle ensure lock lever is fully rotated into unlock position during indexing. | Forces imparted onto head during lock-up | Using automated cycle unlock and re-lock. | Attempted lockup in incorrect unqualified position | Using automated cycle unlock, reposition correctly and re-lock. |
Axes ‘rattling' during indexing (RTP20 only)Possible causes | Remedy |
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Incorrect unlock procedure | Using automated cycle ensure lock lever is fully rotated to unlock position. | Incorrect indexing procedure | Using automated cycle index each axis separately. |
NOTE: The RTP20 is not user serviceable and should be returned to Renishaw if suspected faulty. TP20Poor measuring performancePossible causes | Remedy |
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Stylus configuration too long or not rigid | Use shorter stiffer stylus configuration. | Poor stylus assembly | Ensure stylus joints are kept to a minimum and the joints are clean and secure. | Contamination / damage to stylus ball | Inspect for damage, clean thoroughly with solvent. | Trigger force too high. | Use lower force module. |
Unwanted triggering during probe or CMM movementPossible causes | Remedy |
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Trigger force too low / stylus configuration to heavy | Use higher force module / reduce mass of stylus configuration. |
Probe fails to rearm after triggerPossible causes | Remedy |
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Trigger force too low / stylus configuration too heavy | Use higher force module / reduce mass of stylus configuration. | Probe reseat failure | Re-trigger probe. If problem persists please return to Renishaw for service. |
Loss of measuring accuracyPossible causes | Remedy |
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Mounting not secure | Check that the RTP20 is correctly mounted on the shank and that the screws are secure. Check clamping mechanism in the CMM quill is secure for RTP20. | RTP20 not fully locked | Ensure that the thumbwheel / lock lever is turned fully clockwise. | Force imparted to probe module after locking | Re-qualify the probe. | RTP20 worn or damaged | Use only with the specified probe and extension combinations. | Faulty probe module | Check by substitution or return to Renishaw or your supplier. |
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