hexagon logo
Register Sign in
  • Replies 84 replies
  • Subscribers 223 subscribers
  • Views 798 views
  • Users 0 members are here
Options
Related

True Position in 3 axis???

1CMM4ME
Ok, I have read the post regarding this so called argument that my boss and I got into today. He told me that you cannot measure true position in 3 axis, as I told him he was wrong. I know it depends on the way the FCF calls it out, but I tried to explain to him that it is possible to measure TP in 3 axis.
I have seen the formulas, so I know it's possible. I just wish I could get one of you gurus to reply back explaining that it is possible and why. I see the picture but he does not. I do not like to get into pissing matches with upper management, but I have learned a h**ll of alot from you guys, and I know this is possible. So if one of you fine gentleman can back me up on this, I would very much appreciate it. Thank you very much.
Now I am going to get a cold beer.Smiley
Parents
  • OK, you CAN have LESS as long as the proper number of Axis are controlled in some manner. You CANNOT report 3 axis with a diameteric and you CANNOT report only two axis with a sperical. In your tooling ball scenario TWO of the Axis must be implied to be the SAME for each ball (you still have 3 Axis Nominals that you can get from the print and the locations have no tolerance. I said I will GIVE you that. They ARE controlled in some manner but notnecessarily with BASIC Dims.

    What I want to know is what is the criteria for diametric when there are 3 axis AND orientation controlled?

    Please see attached sketch. 4 BASIC Dims. Assume a diametric TP to ABC (A = Z Axis, B = X Axis, and C = Y axis). In this particular case I call ALL the Dims as SET and translate / rotate to the NOM of the feature and report it. I do NEED 3 of them (the BASIC Angle controls orientation) but the 4th is ignored for Diametric TP. To include it would change the shape of the tolerance zone to spherical. Agree?

    It isn't the number of actual BASIC Dims on the print. It is how MANY AXIS are controlled and reported.
    Attached Files
Reply
  • OK, you CAN have LESS as long as the proper number of Axis are controlled in some manner. You CANNOT report 3 axis with a diameteric and you CANNOT report only two axis with a sperical. In your tooling ball scenario TWO of the Axis must be implied to be the SAME for each ball (you still have 3 Axis Nominals that you can get from the print and the locations have no tolerance. I said I will GIVE you that. They ARE controlled in some manner but notnecessarily with BASIC Dims.

    What I want to know is what is the criteria for diametric when there are 3 axis AND orientation controlled?

    Please see attached sketch. 4 BASIC Dims. Assume a diametric TP to ABC (A = Z Axis, B = X Axis, and C = Y axis). In this particular case I call ALL the Dims as SET and translate / rotate to the NOM of the feature and report it. I do NEED 3 of them (the BASIC Angle controls orientation) but the 4th is ignored for Diametric TP. To include it would change the shape of the tolerance zone to spherical. Agree?

    It isn't the number of actual BASIC Dims on the print. It is how MANY AXIS are controlled and reported.
    Attached Files
Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement