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RTP20 fault finding
RTP20
Poor measuring performance
Possible causes | Remedy |
|---|---|
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 LED
Possible causes | Remedy |
|---|---|
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 |
|---|---|
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 |
|---|---|
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.
TP20
Poor measuring performance
Possible causes | Remedy |
|---|---|
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 movement
Possible causes | Remedy |
|---|---|
Trigger force too low / stylus configuration to heavy | Use higher force module / reduce mass of stylus configuration. |
Probe fails to rearm after trigger
Possible causes | Remedy |
|---|---|
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 accuracy
Possible causes | Remedy |
|---|---|
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. |