Module or Body?

[Scott D. Haselden]

Have any of you guys out there ever experienced a probe continually hitting the sphere in the same spot when calibrating? It almost seems as though the probe is not reading the hit and keeps trying to take the hit over and over. You can tap the probe stylus and it will move to the next hit, but calibration is then screwed.

Out of curiosity, anyone that has experienced this, did it turn out to be the module or the body that was going bad? We have an old PH10 head, using a TP20 module. I'm leaning that direction, because we can move the module to a different CMM with a Renishaw rotating head (that looks similar to a TesaStar head), also using the same body, and it does the same thing. I would think it not really likely that all three probe bodies are going out at the same time.

What do you guys think?

[Matthew D. Hoedeman]

the part that the probe screws into is going bad, it is sticking, not reseating, Pcdmis then re-probes over and over until it reseats.

[Disal]

Not on calibration, but while running a program sometimes it will take the same hit a couple times until it likes it or something. Calibrates good and runs good so i don't know why it does that. Have checked the results a different way and it's been accurate, So i haven't worried about it (PH10, TP20 also)

[michaelwildschutz]

If you see this on auto features you may have accidentally turned on the re measure button .. It is in the upper left area next to the measure now toggle button but it is not available for all auto features.....

[Scott D. Haselden]

Matthew Hoedeman

the part that the probe screws into is going bad

Just for clarification, because I can get easily confused, Do you mean the part that the probe stylus screws into? Or the small silver part or large silver part? Arrow, 1,2,or 3, in this pic? IMG_5479.JPG

[louisd]

Great pic and tool for clarification. however #3 is just an adapter, (more specifically: PAA1 30mm Steel extension bar, Renishaw A-1051-0417). I can't imagine how that component would become a consumable, unless it was crashed in an epic manner that would damage it (presumably the head as well if this occurs!).

[Matthew D. Hoedeman]

Matthew Hoedeman

Just for clarification, because I can get easily confused, Do you mean the part that the probe stylus screws into? Or the small silver part or large silver part? Arrow, 1,2,or 3, in this pic? IMG_5479.JPG

1

[Scott D. Haselden]

Thanks!

[Matthew D. Hoedeman]

Thanks!

YOU CAN TRY to see if you can fix it. It has probably had one too many crashes. You can:

Take that module and place it with the mounting surface on the CMM table. Press down hard. The entire guts of that think can push out slightly if it crashes directly in-line with the probe.

[DAN_M]

Just like Matt said..I have saved numerous "dead" TP20s by DELICATELY yet firmly pressing the bottom into the table. Those small tooling balls on the bottom of the mod sometimes come protrude upwards a bit after a crash..pressing them back in should re-seat and you MIGHT be good.

Depending on your budget, might be worth while to spend the thousand bucks and just get a new one.

[BKulpa]

Send it in for RBE (repair by exchange).

[dwhelchel]

Sometimes you can check the 2 brass buttons on the bottom side of the module, and make sure they are seated properly. If you are having the same problem between different machines with the same module, I would lean more towards the module is wearing out.

[louisd]

The TP20 probe modules have a lifespan of only ~200k 1 million hits according to renishaw. TP200's have about 2million >10 million (in my opinion, more if they don't get crashed).
-EDIT 21jan2020, yes, lifespan of TP20 is ~1million hits. Lifepsan of TP200 is >10million hits. I provided incorrect info above.

[Smallsvillanova]

So can you measure that same way with a tp200 that you do with a tp20?

[Douglas]

the old Tesa modules were rated for > 1 million hits if I recall

[louisd]

yes both are touch trigger probes. the tp20 is more durable, but wears out faster, and is a bit less repeatable.
-The TP200 will break the body or bend the internals of the module very easily, but lasts much longer and is much more accurate.
-Renishaw came out with a TP200b, which is FAR less repeatable than the TP200, but a more durable version of it.
-TP20 and TP200 are NOT interchangeable on some machines, without rewiring inside the controller.
-Also MCR20 and MCR200 even though dock the same and would functionally work, the moment you try to put a TP200 on a MCR20 dock, pcdmis will software lock you out of it, saying only TP20's can be used on MCR20.