different tips - different readings

[dtmtim]

Good morning,

I have a cmm program that uses one size tip to pick up the datums and do the alignment at A0, B0 then I pick up 2 holes, one at A90, B0 and one at A90, B180. If I check the holes using the same tip I used during the alignment I get one set of numbers for the hole locations. If I do a tip change to a larger diameter stylus to check the holes I get a different set of numbers. The locations for the hole sizes change by over .006". Any idea what would be causing this? I originally wrote the program to use the same tip for everything but decided to change it later to use a larger size tip to avoid the possibility of shanking out in the holes. Both tips have been caliberated for all angles used this morning.

PC-DMIS V 4.0
PH10M - TP200

Thanks !
t.

[T Miller]

Did you calibrate both tips at the same time? They need to relate to each other

[Matthew D. Hoedeman]

YEah, for the second tip, you MUST tell it that the tool has NOT moved.

[#2#]

Did you calibrate both tips at the same time? They need to relate to each other

YEah, for the second tip, you MUST tell it that the tool has NOT moved.

Did you calibrate A0B0 on both tips? That angle is used to relate one tip to another tip.

[Matthew D. Hoedeman]

Oh, also if you are un-screwing pieces and putting other piece in, your calibration is GONE. You will NEVEr get the same pieces screwed back in the same way twice, so everytime you screw, you calibrate.

[#2#]

Oh, also if you are un-screwing pieces and putting other piece in, your calibration is GONE. You will NEVEr get the same pieces screwed back in the same way twice, so everytime you screw, you calibrate.

Ohhhh there are so many ways to go with this but I will decline as we are attempting to be "proffesional"

[Matthew D. Hoedeman]

Ohhhh there are so many ways to go with this but I will decline as we are attempting to be "proffesional"

That's why I posted as I posted.

But seriously, if you are NOT using the changer-type probe set-ups and you have to un-screw and screw in different pieces, you have to calibrate after each screw-in.

[#2#]

That's why I posted as I posted.

But seriously, if you are NOT using the changer-type probe set-ups and you have to un-screw and screw in different pieces, you have to calibrate after each screw-in.

Yes, putting the calibration in the program is the easiest way to do it. The only problem is that you have to not move the cal. sphere.

[ag162]

Hello,
Are you using different modules rated differently. You can't accomplish this by changing the styli during the program with just one module and both tips must have the same force rating to be accurate.

VP A.Gore

[dtmtim]

I did not calibrate both tools at the same time. I only calibrated the larger stylus when I realized I needed it. Since the cal sphere had been moved the relationship was not set up correctly. I did not realize the relationship was set up that way. The problem has been corrected.

Thank you all for your valuable posts !!!

t.

[#2#]

I did not calibrate both tools at the same time. I only calibrated the larger stylus when I realized I needed it. Since the cal sphere had been moved the relationship was not set up correctly. I did not realize the relationship was set up that way. The problem has been corrected.

Thank you all for your valuable posts !!!

t.

Woo-Hoo problem solved! What do you guys want to discuss in this thread now?

[Matthew D. Hoedeman]

BEER and BABES!

[Gregl]

Beer

[Jeffrey Lovely]

Beer

[T Miller]

Whiskey