probing 3 point boss

[Guyinthedesert]

I've never used the 3 point boss/bore routine before, but here's what I got. I need to probe the O.D. of a casting, however it has a round flange with 6 bosses (for bolt holes) sticking out of the profile at 60 deg intervals. (30, 90, 150, 210l, 270 and 330 deg)

 

I thought I'd try the renishaw 3 poing boss routine. It seemed to work ok, but when I started doing a test cut, I could see it was way off.

 

I indicated the od best I could with an indicator, it was right on in Y, and -.090 in X.

Then I tried probing just the X with the X boss routine, and I got roughly the same number as with an indicator.

 

Here's the routine I used;

 

G00 G90 G56 X0 Y0

G43 H40 Z1.

G01 Z0.9 F50.

G65 P9832

G65 P9810 Z0.3 F30.

G65 P9823 A0. B120. C240. D4. Z-0.3 S3.

G65 P9810 Z2. F60.

G65 P9833

 

Now, if I change the angles to A60. B180. C300. then Y is still right but X is off .090 the other way.

 

Am I missing something? It almost seems like a bogus calculation in the software, but that seems hard to believe.

 

Any thoughts? TIA

[GoetzInd]

What calibration cycle did you last use? You must use the O9804 vector calibration cycle if you're going to use 3 point.

 

Mike

[Guyinthedesert]

What calibration cycle did you last use? You must use the O9804 vector calibration cycle if you're going to use 3 point.

 

Mike

 

Ah, many thanks, that was it. I wish I had a Renishaw manual. I had one years ago when I was probing on Fanucs, but with Haas, if it's not listed on the VQC, I guess they expect you to just sit there taking wild stabs in the dark?

[GoetzInd]

PM me your e-mail. I will send you the renishaw inspection plus manual for HAAS.

 

Mike

[GPC_CNC]

What calibration cycle did you last use? You must use the O9804 vector calibration cycle if you're going to use 3 point.

 

Mike

 

I've changed our HAAS VQC program to do the vector calibration. Unless you have the 1 MB memory and are really jonesing for space (ie you don't want to keep vector cycles on the machine), there's no point in just running the 4 point calibration. Eventually you'll want to do something with vectors. In the O9023 program search for P9803 (type P9803, then down arrow). P9803 is for 4 point calibration. Change this to P9804 and run the VQC calibration as normal. I've done this to all our Haas's.

 

Greg

[Guyinthedesert]

PM me your e-mail. I will send you the renishaw inspection plus manual for HAAS.

 

Mike

 

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