calibration sphere locate

[MeGoetz]

Is there a way to increase the spacing for the calibration locate portion of the cal routine?

If you answer, “YES the ball has moved”, you take one hit on top of the cal sphere, and then the software takes three hits. I would like to increase the spacing for these hits. After it measures its 3 pts it then procedes to measure the tip dia. The problem is that it starts to measure the shank (uh... no shank calib selected). Is there a trick to this that I'm missing?
It seems that in the rest of the metrology world we need 120° of arc to begin to measure a circle, But the Demon can do it with about 5°?!?!?

What gives?

[Randy P]

Sounds like you have an extension on the probe thats not in your probe setup or wrong tip or calibrate shank box checked. Are you doing 0,0 first?

[MeGoetz]

The probe bulid is correct, and standard Probes, Extensions, Tips/Styli are selected from the list in the probe manager.

Definitely do not have shank calibration selected.

[Randy P]

are you selecting 0,0 as part of your calibration?

[MeGoetz]

Yes, That is the probe tip that is shanking.

[Randy P]

how about your calibration sphere is it correct diamiter. check your tool setup

[MeGoetz]

Everything is the correct size.

My question is "Is there a way to increase the spacing between the hits? "

I would never measure (or locate) a sphere with hits that close together.

I would like to see some spacing that is more reasonable.

[Randy P]

Sorry I can't answer that mine is the same and I don't care for it but it works.

[bob mappes]

you have asked two seperate things

1) increase the spacing when the DCC is locatting the sphere.......probably not...but it actually takes 4 hits, not 3 and works fairly well (my PH10 has a slight tweek to it)

2) hitting the shank....sounds like maybe your settings have the "start angle" set to a negative number....zero (0) is at the equator of the sphere, 90 is at the "north" pole (top)

HTH

[Paul Sarrach]

have you tried to do it in manual/dcc mode?

[wicked_tattoo]

I would also try the manual/dcc, i have had this problem before with a probe build up and i did that and it works fine.

[craiger_ny]

Hmmmm, any chance this is only with new probe builds that you have this problem?

[Wingman]

The CMM can locate the ball with those 4 hits. Especially in the Axis in which you are shanking. The spacing of those hits is not your issue as long as you are hitting somewhere in the vicinity of the top of your ball with the initial hit. For some reason the probe is going past the equator of the Cal Sphere if you are shanking. The only things that can cause that are incorrect Ruby Definition, Incorrect Cal Sphere Diameter, or the your calibration routine is telling it to go below the equator. Are you using 'User Defined' Calibration routine or Default? With a simple 0,0 try using the default.
If you find something else to be the culprit please post it.

[MeGoetz]

I went down to take another look: I moved the sphere and had no problem with the sphere locate portion of the calibration routine. I didn't change a thing. I went back to the machine as if I had never left, moved the sphere, and selected "yes the sphere has moved". absolutely seamless operation this time.

I would love to be able to say it was me doing something but I wonder if it was one of the friday Demons coming out.

I am still surprised though that the sphere can be located with that tight spacing. All pts near the north pole roughly .25 apart for a .75 Dia ball.

[bob mappes]

my sphere is 1.0000" and so the hits will appear even "flater" than on a .750" sphere....no troubles here though...

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