Old problem and again I struggle...CAD, Cyl shaped part, alignment

I have a part that basically looks like a Gauge Pin with a hole drilled thru it (90 perp to the longitudinal axis of the cyl).

I am having a very difficult time trying to get this thing aligned using CAD. I have tried 3 points on one of the flat ends, then 2 points along the length, and a single point on "top" about halfway between the thru hole and the nearest end.

Get Iterative Alignment error.

If I dont use iterative alignment, and instead use cir at one end, a cir at the other end, and the thru hole, I can't get the features to "stick" to the CAD.

I've got the part laying on its side inside a R&R AVP 11-20 V-shaped standoff, with the thru hold pointing up, and the length of the part inline with the machine's X-axis.

Running PCDMIS 2013MR1

Attached Files

Parents

Matthew D. Hoedeman over 10 years ago

With ID cylinder 'square' to an axis

P001       =FEAT/CYLINDER,RECT,OUT,LEAST_SQR
            THEO/0,0,-71.235,0,0,1,26.587,117.686
            ACTL/934.703,213.551,-770.086,0.0536924,0.998557,-0.0010399,26.587,117.686
            MEAS/CYLINDER,6
            HIT/BASIC,NORMAL,-2.369,13.07,-130.078,-0.1783672,0.983964,0,918.483,155.498,-767.711,USE THEO = YES
            HIT/BASIC,NORMAL,-13.29,0.5,-129.318,-0.999294,0.0375702,0,931.029,155.596,-756.738,USE THEO = YES
            HIT/BASIC,NORMAL,-4.631,-12.449,-128.503,-0.3486576,-0.9372502,0,944.04,155.703,-765.342,USE THEO = YES
            HIT/BASIC,NORMAL,-4.741,-12.431,-12.392,-0.3563372,-0.9343574,0,950.255,271.647,-765.353,USE THEO = YES
            HIT/BASIC,NORMAL,-13.271,0.654,-13.224,-0.9987876,0.049228,0,937.109,271.53,-756.878,USE THEO = YES
            HIT/BASIC,NORMAL,-2.407,13.084,-13.976,-0.1809328,0.9834955,0,924.702,271.433,-767.794,USE THEO = YES
            ENDMEAS/
P002       =FEAT/CYLINDER,RECT,IN,LEAST_SQR
            THEO/-8.731,0.245,-65.274,0.9999983,0,-0.0018668,11.113,3.05
            ACTL/934.741,219.528,-761.362,0.0041265,-0.0031328,-0.9999866,11.113,3.05
            MEAS/CYLINDER,8
            HIT/BASIC,NORMAL,-10.223,-5.292,-64.695,-0.0001931,0.9946388,-0.1034099,940.296,219.81,-759.847,USE THEO = YES
            HIT/BASIC,NORMAL,-10.239,-0.197,-59.746,-0.0018609,0.0798187,-0.9968077,935.474,225.026,-759.858,USE THEO = YES
            HIT/BASIC,NORMAL,-10.256,5.813,-65.139,-0.0000443,-0.999719,-0.0237034,929.183,219.963,-759.861,USE THEO = YES
            HIT/BASIC,NORMAL,-10.244,1.551,-70.659,0.0018143,-0.2355648,0.971857,933.142,214.223,-759.849,USE THEO = YES
            HIT/BASIC,NORMAL,-7.223,1.568,-70.665,0.001813,-0.2383993,0.9711655,933.138,214.214,-762.87,USE THEO = YES
            HIT/BASIC,NORMAL,-7.234,5.741,-66.168,0.0002989,-0.9870963,0.1601276,929.212,218.928,-762.881,USE THEO = YES
            HIT/BASIC,NORMAL,-7.219,-0.218,-59.747,-0.0018603,0.0834823,-0.9965075,935.507,225.02,-762.878,USE THEO = YES
            HIT/BASIC,NORMAL,-7.205,-5.29,-64.695,-0.000195,0.9945309,-0.1044426,940.306,219.806,-762.865,USE THEO = YES
            ENDMEAS/
P003       =FEAT/POINT,RECT
            THEO/-7.84,1.811,0,-0.0012686,0.0536875,0.998557
            ACTL/936.687,284.79,-762.328,0,1,0
            MEAS/POINT,1
            HIT/BASIC,NORMAL,-7.84,1.811,0,-0.0012686,0.0536875,0.998557,936.687,284.79,-762.328,USE THEO = YES
            ENDMEAS/
ALIGN01    =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,P001
            ALIGNMENT/ROTATE,XPLUS,TO,P002,ABOUT,ZPLUS
            ALIGNMENT/TRANS,XAXIS,P001
            ALIGNMENT/TRANS,YAXIS,P001
            ALIGNMENT/TRANS,ZAXIS,P003
            ALIGNMENT/TRANS_OFFSET,XAXIS,0
            ALIGNMENT/TRANS_OFFSET,YAXIS,0
            ALIGNMENT/TRANS_OFFSET,ZAXIS,0
            ALIGNMENT/END

With ID Cylinder 12.7 degrees to an axis

P001       =FEAT/CYLINDER,RECT,OUT,LEAST_SQR
            THEO/0,0,-71.235,0,0,1,26.587,117.686
            ACTL/934.703,213.551,-770.086,0.0536924,0.998557,-0.0010399,26.587,117.686
            MEAS/CYLINDER,6
            HIT/BASIC,NORMAL,0.562,13.271,-130.078,0.0423174,0.9991042,0,918.483,155.498,-767.711,USE THEO = YES
            HIT/BASIC,NORMAL,-12.855,3.409,-129.318,-0.9665861,0.256342,0,931.029,155.596,-756.738,USE THEO = YES
            HIT/BASIC,NORMAL,-7.255,-11.126,-128.503,-0.5461784,-0.8376689,0,944.04,155.703,-765.342,USE THEO = YES
            HIT/BASIC,NORMAL,-7.358,-11.084,-12.392,-0.5530341,-0.8331586,0,950.255,271.647,-765.353,USE THEO = YES
            HIT/BASIC,NORMAL,-12.803,3.556,-13.224,-0.9635292,0.2676033,0,937.109,271.53,-756.878,USE THEO = YES
            HIT/BASIC,NORMAL,0.528,13.293,-13.976,0.0397116,0.9992112,0,924.702,271.433,-767.794,USE THEO = YES
            ENDMEAS/
P002       =FEAT/CYLINDER,RECT,IN,LEAST_SQR
            THEO/-8.463,2.159,-65.274,0.9755328,-0.2198458,-0.0018668,11.113,3.05
            ACTL/934.741,219.528,-761.362,0.0041265,-0.0031328,-0.9999866,11.113,3.05
            MEAS/CYLINDER,8
            HIT/BASIC,NORMAL,-11.137,-2.915,-64.695,0.2184792,0.970347,-0.1034099,940.296,219.81,-759.847,USE THEO = YES
            HIT/BASIC,NORMAL,-10.032,2.059,-59.746,0.0157325,0.078275,-0.9968077,935.474,225.026,-759.858,USE THEO = YES
            HIT/BASIC,NORMAL,-8.727,7.925,-65.139,-0.2198276,-0.9752507,-0.0237034,929.183,219.963,-759.861,USE THEO = YES
            HIT/BASIC,NORMAL,-9.652,3.765,-70.659,-0.0500181,-0.2302005,0.971857,933.142,214.223,-759.849,USE THEO = YES
            HIT/BASIC,NORMAL,-6.702,3.118,-70.665,-0.0506425,-0.2329653,0.9711655,933.138,214.214,-762.87,USE THEO = YES
            HIT/BASIC,NORMAL,-5.795,7.191,-66.168,-0.2167177,-0.9630122,0.1601276,929.212,218.928,-762.881,USE THEO = YES
            HIT/BASIC,NORMAL,-7.09,1.374,-59.747,0.0165385,0.0818489,-0.9965075,935.507,225.02,-762.878,USE THEO = YES
            HIT/BASIC,NORMAL,-8.192,-3.576,-64.695,0.2184536,0.9702421,-0.1044426,940.306,219.806,-762.865,USE THEO = YES
            ENDMEAS/
P003       =FEAT/POINT,RECT
            THEO/-7.25,3.49,0,0.0105654,0.0526529,0.998557
            ACTL/936.687,284.79,-762.328,0,1,0
            MEAS/POINT,1
            HIT/BASIC,NORMAL,-7.25,3.49,0,0.0105654,0.0526529,0.998557,936.687,284.79,-762.328,USE THEO = YES
            ENDMEAS/
ALIGN01    =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,P001
            ALIGNMENT/ROTATE,XPLUS,TO,P002,ABOUT,ZPLUS
            ALIGNMENT/TRANS,XAXIS,P001
            ALIGNMENT/TRANS,YAXIS,P001
            ALIGNMENT/TRANS,ZAXIS,P003
            ALIGNMENT/ROTATE_OFFSET,12.7,ABOUT,ZPLUS
            ALIGNMENT/TRANS_OFFSET,XAXIS,0
            ALIGNMENT/TRANS_OFFSET,YAXIS,0
            ALIGNMENT/TRANS_OFFSET,ZAXIS,0
            ALIGNMENT/END

The angle of the ID cylinder to the OD cylinder along the length of the OD cylinder makes no difference, it's ONLY the angle to the axis PERP to the OD cylinder and ID cylinder that matters.

Reply

Matthew D. Hoedeman over 10 years ago

With ID cylinder 'square' to an axis

P001       =FEAT/CYLINDER,RECT,OUT,LEAST_SQR
            THEO/0,0,-71.235,0,0,1,26.587,117.686
            ACTL/934.703,213.551,-770.086,0.0536924,0.998557,-0.0010399,26.587,117.686
            MEAS/CYLINDER,6
            HIT/BASIC,NORMAL,-2.369,13.07,-130.078,-0.1783672,0.983964,0,918.483,155.498,-767.711,USE THEO = YES
            HIT/BASIC,NORMAL,-13.29,0.5,-129.318,-0.999294,0.0375702,0,931.029,155.596,-756.738,USE THEO = YES
            HIT/BASIC,NORMAL,-4.631,-12.449,-128.503,-0.3486576,-0.9372502,0,944.04,155.703,-765.342,USE THEO = YES
            HIT/BASIC,NORMAL,-4.741,-12.431,-12.392,-0.3563372,-0.9343574,0,950.255,271.647,-765.353,USE THEO = YES
            HIT/BASIC,NORMAL,-13.271,0.654,-13.224,-0.9987876,0.049228,0,937.109,271.53,-756.878,USE THEO = YES
            HIT/BASIC,NORMAL,-2.407,13.084,-13.976,-0.1809328,0.9834955,0,924.702,271.433,-767.794,USE THEO = YES
            ENDMEAS/
P002       =FEAT/CYLINDER,RECT,IN,LEAST_SQR
            THEO/-8.731,0.245,-65.274,0.9999983,0,-0.0018668,11.113,3.05
            ACTL/934.741,219.528,-761.362,0.0041265,-0.0031328,-0.9999866,11.113,3.05
            MEAS/CYLINDER,8
            HIT/BASIC,NORMAL,-10.223,-5.292,-64.695,-0.0001931,0.9946388,-0.1034099,940.296,219.81,-759.847,USE THEO = YES
            HIT/BASIC,NORMAL,-10.239,-0.197,-59.746,-0.0018609,0.0798187,-0.9968077,935.474,225.026,-759.858,USE THEO = YES
            HIT/BASIC,NORMAL,-10.256,5.813,-65.139,-0.0000443,-0.999719,-0.0237034,929.183,219.963,-759.861,USE THEO = YES
            HIT/BASIC,NORMAL,-10.244,1.551,-70.659,0.0018143,-0.2355648,0.971857,933.142,214.223,-759.849,USE THEO = YES
            HIT/BASIC,NORMAL,-7.223,1.568,-70.665,0.001813,-0.2383993,0.9711655,933.138,214.214,-762.87,USE THEO = YES
            HIT/BASIC,NORMAL,-7.234,5.741,-66.168,0.0002989,-0.9870963,0.1601276,929.212,218.928,-762.881,USE THEO = YES
            HIT/BASIC,NORMAL,-7.219,-0.218,-59.747,-0.0018603,0.0834823,-0.9965075,935.507,225.02,-762.878,USE THEO = YES
            HIT/BASIC,NORMAL,-7.205,-5.29,-64.695,-0.000195,0.9945309,-0.1044426,940.306,219.806,-762.865,USE THEO = YES
            ENDMEAS/
P003       =FEAT/POINT,RECT
            THEO/-7.84,1.811,0,-0.0012686,0.0536875,0.998557
            ACTL/936.687,284.79,-762.328,0,1,0
            MEAS/POINT,1
            HIT/BASIC,NORMAL,-7.84,1.811,0,-0.0012686,0.0536875,0.998557,936.687,284.79,-762.328,USE THEO = YES
            ENDMEAS/
ALIGN01    =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,P001
            ALIGNMENT/ROTATE,XPLUS,TO,P002,ABOUT,ZPLUS
            ALIGNMENT/TRANS,XAXIS,P001
            ALIGNMENT/TRANS,YAXIS,P001
            ALIGNMENT/TRANS,ZAXIS,P003
            ALIGNMENT/TRANS_OFFSET,XAXIS,0
            ALIGNMENT/TRANS_OFFSET,YAXIS,0
            ALIGNMENT/TRANS_OFFSET,ZAXIS,0
            ALIGNMENT/END

With ID Cylinder 12.7 degrees to an axis

P001       =FEAT/CYLINDER,RECT,OUT,LEAST_SQR
            THEO/0,0,-71.235,0,0,1,26.587,117.686
            ACTL/934.703,213.551,-770.086,0.0536924,0.998557,-0.0010399,26.587,117.686
            MEAS/CYLINDER,6
            HIT/BASIC,NORMAL,0.562,13.271,-130.078,0.0423174,0.9991042,0,918.483,155.498,-767.711,USE THEO = YES
            HIT/BASIC,NORMAL,-12.855,3.409,-129.318,-0.9665861,0.256342,0,931.029,155.596,-756.738,USE THEO = YES
            HIT/BASIC,NORMAL,-7.255,-11.126,-128.503,-0.5461784,-0.8376689,0,944.04,155.703,-765.342,USE THEO = YES
            HIT/BASIC,NORMAL,-7.358,-11.084,-12.392,-0.5530341,-0.8331586,0,950.255,271.647,-765.353,USE THEO = YES
            HIT/BASIC,NORMAL,-12.803,3.556,-13.224,-0.9635292,0.2676033,0,937.109,271.53,-756.878,USE THEO = YES
            HIT/BASIC,NORMAL,0.528,13.293,-13.976,0.0397116,0.9992112,0,924.702,271.433,-767.794,USE THEO = YES
            ENDMEAS/
P002       =FEAT/CYLINDER,RECT,IN,LEAST_SQR
            THEO/-8.463,2.159,-65.274,0.9755328,-0.2198458,-0.0018668,11.113,3.05
            ACTL/934.741,219.528,-761.362,0.0041265,-0.0031328,-0.9999866,11.113,3.05
            MEAS/CYLINDER,8
            HIT/BASIC,NORMAL,-11.137,-2.915,-64.695,0.2184792,0.970347,-0.1034099,940.296,219.81,-759.847,USE THEO = YES
            HIT/BASIC,NORMAL,-10.032,2.059,-59.746,0.0157325,0.078275,-0.9968077,935.474,225.026,-759.858,USE THEO = YES
            HIT/BASIC,NORMAL,-8.727,7.925,-65.139,-0.2198276,-0.9752507,-0.0237034,929.183,219.963,-759.861,USE THEO = YES
            HIT/BASIC,NORMAL,-9.652,3.765,-70.659,-0.0500181,-0.2302005,0.971857,933.142,214.223,-759.849,USE THEO = YES
            HIT/BASIC,NORMAL,-6.702,3.118,-70.665,-0.0506425,-0.2329653,0.9711655,933.138,214.214,-762.87,USE THEO = YES
            HIT/BASIC,NORMAL,-5.795,7.191,-66.168,-0.2167177,-0.9630122,0.1601276,929.212,218.928,-762.881,USE THEO = YES
            HIT/BASIC,NORMAL,-7.09,1.374,-59.747,0.0165385,0.0818489,-0.9965075,935.507,225.02,-762.878,USE THEO = YES
            HIT/BASIC,NORMAL,-8.192,-3.576,-64.695,0.2184536,0.9702421,-0.1044426,940.306,219.806,-762.865,USE THEO = YES
            ENDMEAS/
P003       =FEAT/POINT,RECT
            THEO/-7.25,3.49,0,0.0105654,0.0526529,0.998557
            ACTL/936.687,284.79,-762.328,0,1,0
            MEAS/POINT,1
            HIT/BASIC,NORMAL,-7.25,3.49,0,0.0105654,0.0526529,0.998557,936.687,284.79,-762.328,USE THEO = YES
            ENDMEAS/
ALIGN01    =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,P001
            ALIGNMENT/ROTATE,XPLUS,TO,P002,ABOUT,ZPLUS
            ALIGNMENT/TRANS,XAXIS,P001
            ALIGNMENT/TRANS,YAXIS,P001
            ALIGNMENT/TRANS,ZAXIS,P003
            ALIGNMENT/ROTATE_OFFSET,12.7,ABOUT,ZPLUS
            ALIGNMENT/TRANS_OFFSET,XAXIS,0
            ALIGNMENT/TRANS_OFFSET,YAXIS,0
            ALIGNMENT/TRANS_OFFSET,ZAXIS,0
            ALIGNMENT/END

The angle of the ID cylinder to the OD cylinder along the length of the OD cylinder makes no difference, it's ONLY the angle to the axis PERP to the OD cylinder and ID cylinder that matters.

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