POINTDATA QUESTION (scanning)

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  • POINTDATA QUESTION (scanning)

    when doing a linear closed scan i was wondering why the reports
    always read a deviation when the axis is set to zero. in other words
    the y axis is set to zero, the hits are at y axis zero but the reports
    always show a deviation anywhere from .0001 to .006. i know if i do
    an individual vector point and set the x or y axis to zero the report
    reads zero. b&s mistral,ph10t,tp20. i'm thinking that this is because
    we're not using a true scanning head like the sp600. or am i off base?
    sigpic
    Southern Man don't need him around anyhow!

  • #2
    Well, do you have your vectors set for a ZERO (or 1) for the axis you want to stay at zero? They can wander off, ya know. Also, do you use SNAP point when doing the individual points? That will make the zero/zero-vector point show a result of zero.
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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    • #3
      Originally posted by Matthew D. Hoedeman View Post
      Well, do you have your vectors set for a ZERO (or 1) for the axis you want to stay at zero? They can wander off, ya know. Also, do you use SNAP point when doing the individual points? That will make the zero/zero-vector point show a result of zero.
      vectors are correct & and i don't always use snap when taking individual vector points
      sigpic
      Southern Man don't need him around anyhow!

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      • #4
        well i guess nobody has any input on this- does anyone here use scanning?
        sigpic
        Southern Man don't need him around anyhow!

        Comment


        • #5
          Originally posted by george frick View Post
          well i guess nobody has any input on this- does anyone here use scanning?
          George,

          I do scanning with an SP600. Can you posta little snippet of code so I can get a better idea of what you're doing?
          sigpic

          James Mannes

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          • #6
            I scan nearly every day. I have not seen the types of results you have though.
            I use SM25 head and or TP 20. Are you useing models?
            Robert Horne
            Va.

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            • #7
              I just ran scan w/50pts across my table top and get no dev at all.

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              • #8
                Why closed scan and not open?
                Robert Horne
                Va.

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                • #9
                  Originally posted by robehor4 View Post
                  I scan nearly every day. I have not seen the types of results you have though.
                  I use SM25 head and or TP 20. Are you useing models?
                  yes we are using models- quality engineer says it has something to do with the cad=part.
                  i just don't know for sure. project is assigned to engineering. i was just reviewing the cmm
                  program and noticed the slight deviation in the "locked" axes (z/x,z/y). no one else here will
                  admit "i just don't know". that is a career killer at large companies like general dynamics-
                  so everyone knows a little about something and a lot about nothing.
                  Last edited by george frick; 08-14-2007, 03:14 PM.
                  sigpic
                  Southern Man don't need him around anyhow!

                  Comment


                  • #10
                    I never use CAD = Part

                    Here is an example of my generic startup. Since I use an external alignment for the machine locator I use a generic point with offset dimensions to the part Zero. Once I align this as XYZ zero it moves the point to CAD XYZ zero without useing CAD = Part


                    STARTUP =ALIGNMENT/START,RECALL:,LIST=YES
                    ALIGNMENT/END
                    MODE/MANUAL
                    FORMAT/ ,OPTIONS, ,HEADINGS, , ;MEAS,NOM,DEV,TOL,OUTTOL, ,
                    LOADPROBE/TM25-20-TP20-3X30X17
                    TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
                    RECALL/ALIGNMENT,EXTERNAL,a1,LOCATOR:a1
                    $$ NO,This program was created on 01/03/07 by Rob Horne. Print Revision # 2753563 Program Revision #1.
                    C1 =COMMENT/YESNO,NO,Do you Wish to See Set Up Sheet?
                    IF/C1.INPUT == "YES"
                    EXTERNALCOMMAND/DISPLAY ; F:\QC\SETUPSHEETS\2753563.BAT
                    END_IF/
                    C2 =COMMENT/YESNO,NO,Do you wish to Calibrate probe?
                    WORKPLANE/ZPLUS
                    IF/C2.INPUT == "YES"
                    COMMENT/OPER,NO,Please be sure sphere is in normal Location for calibration!!!!!!
                    AUTOCALIBRATE/PROBE, PARAMETER_SET=ALL-TIPS-WITH-DEFAULTS, QUALTOOL_MOVED=NO,
                    SHOW_SUMMARY=NO, OVERWRITE_RESULTSFILE=NO
                    END_IF/
                    L1 =LABEL/
                    C3 =COMMENT/INPUT,YES,'Work Order\PO # ?'
                    C4 =COMMENT/INPUT,YES,'Clock #?'
                    C5 =COMMENT/INPUT,YES,'Serial #'
                    COMMENT/OPER,NO,Machine about to go into DCC Mode.
                    ,Do you wish to continue?
                    ,Please be sure probe is clear!!!!!!!!!!!!
                    MOVESPEED/ 50
                    TOUCHSPEED/ 2
                    PREHIT/ 0.5
                    RETRACT/ 0.5
                    FLY/ON,0.1181
                    DISPLAYPRECISION/5
                    MODE/DCC
                    F1 =GENERIC/POINT,INDEPENDENT,RECT,$
                    NOM/XYZ,0,0,0,$
                    MEAS/XYZ,3,0,6.1,$
                    NOM/IJK,0,0,1,$
                    MEAS/IJK,0,0,1
                    A2 =ALIGNMENT/START,RECALL:LOCATOR:a1,LIST=YES
                    ALIGNMENT/TRANS,XAXIS,F1
                    ALIGNMENT/TRANS,YAXIS,F1
                    ALIGNMENT/TRANS,ZAXIS,F1
                    ALIGNMENT/END
                    Robert Horne
                    Va.

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                    • #11
                      Is this a 2d or 3d surface and what version are you using? The numbers seem too high for normal positioning error.

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