Will this work? (creating datum simulator)

**Matthew D. Hoedeman** · 07-16-2019, 03:15 PM

wow, that's a lot to get a plane......

Here's an idea, use 3 tooling balls, measure those (as spheres), construct a plane through them, then in your alignment offset by the ball radius. Should be a 'simple' thing to make. Flat plate, 3 reamed holes, 3 tooling balls. bingo-bango-bongo. You could even put in 2 dowels pins to use as locators for the part. Quick, easy fixture to make, and you KNOW that your part is only touching those 3 points.

Other than that, I guess it is legit.

Nothing wrong with taking manual touches on those risers as well. IF you are worried about the exact locations not being the same every time, you could code it so that it will DCC the EXACT manual touches you take. This is a template program I have for when they dump of bunch of reverse engineering work on me. I measure a plane and 2 dowels in a detail, then it goes into DCC mode and takes the EXACT touches for the plane that I took on the table and the centers of the dowels I measured, no matter where I take the hits.

Code:

M1         =FEAT/PLANE,RECT,TRIANGLE
            THEO/24.893,21.517,0,0,0,1
            ACTL/813.942,-100.274,-781.278,0.0000055,-0.000022,1
            MEAS/PLANE,4
            HIT/BASIC,NORMAL,-21.129,-14.415,-0.001,0,0,1,759.763,-122.04,-781.279,USE THEO = YES
            HIT/BASIC,NORMAL,-33.853,29.679,0.001,0,0,1,759.761,-76.147,-781.276,USE THEO = YES
            HIT/BASIC,NORMAL,70.26,59.713,-0.001,0,0,1,868.12,-76.15,-781.278,USE THEO = YES
            HIT/BASIC,NORMAL,84.292,11.09,0.001,0,0,1,868.123,-126.758,-781.278,USE THEO = YES
            ENDMEAS/
ALIGN00    =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,M1
            ALIGNMENT/TRANS,ZAXIS,M1
            ALIGNMENT/END
M2         =FEAT/CIRCLE,RECT,IN,LEAST_SQR
            THEO/0,0,15.017,0,0,1,7.052
            ACTL/784.064,-114.064,15.017,0,0,1,7.052
            MEAS/CIRCLE,4,WORKPLANE
            HIT/BASIC,NORMAL,3.337,1.165,15.004,-0.9440796,-0.3297178,0,787.594,-113.87,15.004,USE THEO = YES
            HIT/BASIC,NORMAL,-2.077,2.831,15.021,0.5914209,-0.806363,0,782.854,-110.769,15.021,USE THEO = YES
            HIT/BASIC,NORMAL,-3.531,0.26,15.021,0.9973033,-0.0733908,0,780.744,-112.836,15.021,USE THEO = YES
            HIT/BASIC,NORMAL,1.087,-3.345,15.022,-0.3089437,0.9510803,0,784.181,-117.58,15.022,USE THEO = YES
            ENDMEAS/
M3         =FEAT/CIRCLE,RECT,IN,LEAST_SQR
            THEO/57.324,0,14.872,0,0,1,7.011
            ACTL/839.142,-129.955,14.872,0,0,1,7.011
            MEAS/CIRCLE,4,WORKPLANE
            HIT/BASIC,NORMAL,60.823,0.135,14.871,-0.9992614,-0.0384267,0,842.541,-130.795,14.871,USE THEO = YES
            HIT/BASIC,NORMAL,55.443,2.964,14.871,0.5358048,-0.8443419,0,838.157,-126.586,14.871,USE THEO = YES
            HIT/BASIC,NORMAL,53.85,-0.43,14.872,0.9924418,0.1227166,0,835.685,-129.405,14.872,USE THEO = YES
            HIT/BASIC,NORMAL,58.656,-3.248,14.872,-0.3793495,0.9252534,0,839.521,-133.445,14.872,USE THEO = YES
            ENDMEAS/
M4         =FEAT/LINE,RECT,UNBND
            THEO/0,0,15.017,1,0,0
            ACTL/784.064,-114.064,15.017,0.960811,-0.2772043,0
            CONSTR/LINE,BF,2D,M2,M3,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
ALIGN01    =ALIGNMENT/START,RECALL:ALIGN00, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,M1
            ALIGNMENT/ROTATE,XPLUS,TO,M4,ABOUT,ZPLUS
            ALIGNMENT/TRANS,XAXIS,M2
            ALIGNMENT/TRANS,YAXIS,M2
            ALIGNMENT/TRANS,ZAXIS,M1
            ALIGNMENT/TRANS_OFFSET,XAXIS,0
            ALIGNMENT/TRANS_OFFSET,YAXIS,0
            ALIGNMENT/TRANS_OFFSET,ZAXIS,0
            ALIGNMENT/END
            MODE/DCC
            CLEARP/ZPLUS,CP1.INPUT,ZPLUS,0
            MOVE/CLEARPLANE
            TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=16.093
            MOVE/CLEARPLANE
A1         =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/M1.HIT[1].X,M1.HIT[1].Y,0,0,0,1
            ACTL/-21.129,-14.415,0,0,0,1
            TARG/M1.HIT[1].X,M1.HIT[1].Y,0,0,0,1
            THEO_THICKNESS = 0,RECT,SNAP = YES,$
            AUTO MOVE = NO,DISTANCE = 10
            MOVE/CLEARPLANE
A2         =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/M1.HIT[2].X,M1.HIT[2].Y,0,0,0,1
            ACTL/-33.853,29.679,0,0,0,1
            TARG/M1.HIT[2].X,M1.HIT[2].Y,0,0,0,1
            THEO_THICKNESS = 0,RECT,SNAP = YES,$
            AUTO MOVE = NO,DISTANCE = 10
            MOVE/CLEARPLANE
A3         =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/M1.HIT[3].X,M1.HIT[3].Y,0,0,0,1
            ACTL/70.26,59.713,-0.001,0,0,1
            TARG/M1.HIT[3].X,M1.HIT[3].Y,0,0,0,1
            THEO_THICKNESS = 0,RECT,SNAP = YES,$
            AUTO MOVE = NO,DISTANCE = 10
            MOVE/CLEARPLANE
A4         =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/M1.HIT[4].X,M1.HIT[4].Y,0,0,0,1
            ACTL/84.292,11.09,0.003,0,0,1
            TARG/M1.HIT[4].X,M1.HIT[4].Y,0,0,0,1
            THEO_THICKNESS = 0,RECT,SNAP = YES,$
            AUTO MOVE = NO,DISTANCE = 10
            MOVE/CLEARPLANE
DOWEL1     =AUTO/CIRCLE,SHOWALLPARAMS = YES,SHOWHITS = NO
            THEO/0,0,M2.Z,0,0,1,M2.D
            ACTL/-0.009,-0.009,15.017,0,0,1,7.051
            TARG/0,0,M2.Z,0,0,1
            THEO_THICKNESS = 0,RECT,IN,STRAIGHT,LEAST_SQR,ONERROR = NO,$
            AUTO MOVE = NO,DISTANCE = 10,RMEAS = None,None,None,$
            READ POS = NO,FIND HOLE = NO,REMEASURE = NO,$
            NUMHITS = 4,INIT = 0,PERM = 0,SPACER = 0,PITCH = 0,$
            START ANG = 0,END ANG = 0,DEPTH = 0,$
            ANGLE VEC = 1,0,0
            MOVE/CLEARPLANE
DOWEL2     =AUTO/CIRCLE,SHOWALLPARAMS = YES,SHOWHITS = NO
            THEO/M3.X,0,M3.Z,0,0,1,M2.D
            ACTL/57.329,0.008,14.872,0,0,1,7.024
            TARG/M3.X,0,M3.Z,0,0,1
            THEO_THICKNESS = 0,RECT,IN,STRAIGHT,LEAST_SQR,ONERROR = NO,$
            AUTO MOVE = NO,DISTANCE = 10,RMEAS = None,None,None,$
            READ POS = NO,FIND HOLE = NO,REMEASURE = NO,$
            NUMHITS = 4,INIT = 0,PERM = 0,SPACER = 0,PITCH = 0,$
            START ANG = 0,END ANG = 0,DEPTH = 0,$
            ANGLE VEC = 1,0,0
ADATUM     =FEAT/PLANE,RECT,OUTLINE
            THEO/31.477,-8.695,0,0,0,1
            ACTL/24.893,21.517,0,-0.0000195,0.0000374,1
            CONSTR/PLANE,BF,A1,A2,A3,A4,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
BDATUM     =FEAT/LINE,RECT,UNBND
            THEO/0,0,8.072,0.9999209,0,-0.0125754
            ACTL/-0.009,-0.009,15.017,0.9999968,0.0002913,-0.0025289
            CONSTR/LINE,BF,3D,DOWEL1,DOWEL2,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0

**DAN_M** · 07-16-2019, 03:23 PM

Thanks for the insight & sanity check!

**Matthew D. Hoedeman** · 07-17-2019, 06:18 AM

what's it like? 90% of it is 2D (lines, circles, and 2D scans). The other 10% is then done with the Romer, using the same pickups as used on the CMM.

**Kp61dude!** · 07-17-2019, 11:52 AM

Originally posted by Matthew D. Hoedeman View Post

what's it like? 90% of it is 2D (lines, circles, and 2D scans). The other 10% is then done with the Romer, using the same pickups as used on the CMM.

I always imaged it to be a pain reverse engineering with a bridge CMM and always reverted to 'I would just use an arm'. Thanks for the insight!

**Matthew D. Hoedeman** · 07-17-2019, 12:04 PM

Originally posted by Kp61dude! View Post

I always imaged it to be a pain reverse engineering with a bridge CMM and always reverted to 'I would just use an arm'. Thanks for the insight!

Most of what we RE is trim steels, not form steels. Usually work we get in to replace busted up details (yeah, that part sucks). We get this work from the same places that we build tools for, and WE are always required to include updated designs of each and every detail in the tool. But for some reason, they apparently don't require others to do the same, so, 2D scanning....

Will this work? (creating datum simulator)

Will this work? (creating datum simulator)

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