Tweet
I have a part that the flat surface (Datum A) is where the part must rest during the program. My question is how do I add the plane of datum A? Which will be hits taking on 1,2,3 block in the program. Do i add the fixture (123 block) or do i build the program taking those hits on the part offline but place instructions in the notes of the program?
-
-
You could perform a complete alignment without datum A, then create Auto Vector Points at points outside of the part model that you know will be on the block. -
I do this a lot.
I'll import my part model and three separate models for my blocks that I made in solidworks.
My procedure:
1) arrange blocks as needed
2) take picture of blocks to put in program
DO THIS OVER EACH OF THE THREE BLOCKS-->
-put read point over center of block, make origin, switch to dcc, measure a plane at XY0, switch back to manual, switch back to original alignment
-use pictures to tell the operator what to do. (put probe over block one, block two, block three)
-construct all of the planes together into DATUM_A_SIM
-use a picture to tell the operator to put the part up on the blocks
-write program us usualComment
-
I do a manual plane with 3 hits (one on each block or bar). Then I switch to DCC to create (3) Auto vector points using the manual plane as target. See below.
Code:BARM =FEAT/PLANE,CARTESIAN,TRIANGLE THEO/<1.7867,-0.4727,0>,<0,0,1> ACTL/<15.2224,22.3318,-36.312>,<0.0010745,-0.0001168,0.9999994> MEAS/PLANE,3 HIT/BASIC,NORMAL,<-20.75,2.63,0>,<0,0,1>,<36.8372,31.1854,-36.3342>,USE THEO=YES HIT/BASIC,NORMAL,<10.575,-16.74,0>,<0,0,1>,<-5.0621,30.969,-36.2892>,USE THEO=YES HIT/BASIC,NORMAL,<15.535,12.692,0>,<0,0,1>,<13.892,4.841,-36.3126>,USE THEO=YES ENDMEAS/ MANUAL_ALN =ALIGNMENT/START,RECALL:STARTUP,LIST=YES (DO LEVEL,ROTATE & ORIGIN) MODE/DCC MOVE/CLEARPLANE (OR MOVE/POINTS) BAR1 =FEAT/CONTACT/VECTOR POINT,CARTESIAN THEO/<BARM.HIT[1].X,BARM.HIT[1].Y,0>,<0,0,1> ACTL/<-6.4583,23.317,0.0089>,<0,0,1> TARG/<BARM.HIT[1].X,BARM.HIT[1].Y,0>,<0,0,1> SNAP=YES SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=YES AVOIDANCE MOVE=NO,DISTANCE=0 SHOW HITS=NO BAR2 =FEAT/CONTACT/VECTOR POINT,CARTESIAN THEO/<BARM.HIT[2].X,BARM.HIT[2].Y,0>,<0,0,1> ACTL/<-5.7219,-18.5764,0.0038>,<0,0,1> TARG/<BARM.HIT[2].X,BARM.HIT[2].Y,0>,<0,0,1> SNAP=YES SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=YES AVOIDANCE MOVE=NO,DISTANCE=0 SHOW HITS=NO BAR3 =FEAT/CONTACT/VECTOR POINT,CARTESIAN THEO/<BARM.HIT[3].X,BARM.HIT[3].Y,0>,<0,0,1> ACTL/<20.1689,0.7006,0.0093>,<0,0,1> TARG/<BARM.HIT[3].X,BARM.HIT[3].Y,0>,<0,0,1> SNAP=YES SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=YES AVOIDANCE MOVE=NO,DISTANCE=0 SHOW HITS=NO PLN_A =FEAT/PLANE,CARTESIAN,TRIANGLE,NO THEO/<1.7867,-0.4727,0>,<0,0,1> ACTL/<2.6629,1.8137,0.0073>,<-0.0001191,-0.0001238,1> CONSTR/PLANE,BF,BAR1,BAR2,BAR3,, OUTLIER_REMOVAL/OFF,3 FILTER/OFF,WAVELENGTH=0sigpicIt's corona time!
737 Xcel Cad++ v2009MR1....SE HABLA ESPAÑOLComment
-
NoobNoob check this out
If I need to simulate a datum surface, I'll use inspection risers or some blocks and I'll make my machine measure the fixturing that my part will be put on. The process is controlled with detailed pictures, read points, and carefully manipulating my machine's movement parameters.
Datums for this part: Top OD is -B- and my bevel gear face is -A-. (If you want to be a little less fancy, you could use single points instead of constructing three planes together).
pic of bevel gear.PNGCode:STARTUP =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES ALIGNMENT/END LOADPROBE/7107_G_4X20 TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0 MOVESPEED/ 300*0.9 TOUCHSPEED/ 5 PREHIT/0.125 RETRACT/0.125 CHECK/0.025,1 COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO, Get three Ø2" X 4" tall inspection risers. Arrange risers on CMM table so they will contact the part's gear face at 9:00, 1:00, and 5:00. Press OK to continue. COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO, Make sure part IS NOT ON THE TABLE. Press OK to continue. COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO, Put probe directly over riser at 9:00 Press OK for CNC Measurement READPOINT_RISER_1=FEAT/POINT,CARTESIAN THEO/<-3.5,0,0.1>,<0,0,1> ACTL/<-3.5,0,0.1>,<0,0,1> READPOINT/ A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/TRANS,XAXIS,READPOINT_RISER_1 ALIGNMENT/TRANS,YAXIS,READPOINT_RISER_1 ALIGNMENT/TRANS,ZAXIS,READPOINT_RISER_1 ALIGNMENT/END MODE/DCC PLN_RISER_1=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR THEO/<0,0,-0.1>,<0,0,1> ACTL/<0,0,-0.1>,<0,0,1> TARG/<0,0,-0.1>,<0,0,1> ANGLE VEC=<1,0,0>,RADIAL SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=NO MODE/MANUAL RECALL/ALIGNMENT,INTERNAL,STARTUP COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO, Put probe directly over riser at 1:00 Press OK for CNC Measurement READPOINT_RISER_2=FEAT/POINT,CARTESIAN THEO/<1.75,3.0311,0.1>,<0,0,1> ACTL/<1.75,3.0311,0.1>,<0,0,1> READPOINT/ A2 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/TRANS,XAXIS,READPOINT_RISER_2 ALIGNMENT/TRANS,YAXIS,READPOINT_RISER_2 ALIGNMENT/TRANS,ZAXIS,READPOINT_RISER_2 ALIGNMENT/END MODE/DCC PLN_RISER_2=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR THEO/<0,0,-0.1>,<0,0,1> ACTL/<0,0,-0.1>,<0,0,1> TARG/<0,0,-0.1>,<0,0,1> ANGLE VEC=<0,0,1>,RADIAL SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=NO MODE/MANUAL RECALL/ALIGNMENT,INTERNAL,STARTUP COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO, Put probe directly over riser at 5:00 Press OK for CNC Measurement READPOINT_RISER_3=FEAT/POINT,CARTESIAN THEO/<1.75,-3.0311,0.1>,<0,0,1> ACTL/<1.75,-3.0311,0.1>,<0,0,1> READPOINT/ A3 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/TRANS,XAXIS,READPOINT_RISER_3 ALIGNMENT/TRANS,YAXIS,READPOINT_RISER_3 ALIGNMENT/TRANS,ZAXIS,READPOINT_RISER_3 ALIGNMENT/END MODE/DCC PLN_RISER_3=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR THEO/<0,0,-0.1>,<0,0,1> ACTL/<0,0,-0.1>,<0,0,1> TARG/<0,0,-0.1>,<0,0,1> ANGLE VEC=<0,0,1>,RADIAL SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=NO RECALL/ALIGNMENT,INTERNAL,STARTUP SCN1 =FEAT/SET,CARTESIAN THEO/<0,0,0>,<0,0,1> ACTL/<0,0,0>,<0,0,1> CONSTR/SET,BASIC,PLN_RISER_1.HIT[1..PLN_RISER_1.NUMHITS],PLN_RISER_2.HIT[1..PLN_RISER_2.NUMHITS],PLN_RISER_3.HIT[1..PLN_RISER_3.NUMHITS],, PLN_DATUM_A_SIM=FEAT/PLANE,CARTESIAN,TRIANGLE,NO,LEAST_SQR THEO/<0,0,0>,<0,0,1> ACTL/<0,0,0>,<0,0,1> CONSTR/PLANE,BF,SCN1,, OUTLIER_REMOVAL/OFF,3 FILTER/OFF,WAVELENGTH=0 CIR_READPOINTS=FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR,NO THEO/<0,0,0.1>,<0,0,1>,7 ACTL/<0,0,0.1>,<0,0,1>,7 CONSTR/CIRCLE,BF,2D,READPOINT_RISER_1,READPOINT_RISER_2,READPOINT_RISER_3,, OUTLIER_REMOVAL/OFF,3 FILTER/OFF,UPR=0 MOVE/POINT,NORMAL,<0,6,6> MODE/MANUAL COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO, **********DO NOT MOVE INSPECTION RISERS********** Put part on risers. Gear face down. Press OK for CNC Measurement MODE/DCC MOVE/POINT,NORMAL,<0,0,5> A4 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/LEVEL,ZPLUS,PLN_DATUM_A_SIM ALIGNMENT/TRANS,XAXIS,CIR_READPOINTS ALIGNMENT/TRANS,YAXIS,CIR_READPOINTS ALIGNMENT/TRANS,ZAXIS,PLN_DATUM_A_SIM ALIGNMENT/END MOVESPEED/ 300*0.9 TOUCHSPEED/ 15 PREHIT/3 RETRACT/3 CHECK/0.025,1 CIRXY1 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR THEO/<0,0,3.3>,<0,0,1>,5.7109,0 ACTL/<0,0,3.3>,<0,0,1>,5.7109,0 TARG/<0,0,3.3>,<0,0,1> START ANG=0,END ANG=360 ANGLE VEC=<1,0,0> DIRECTION=CCW SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=NO A5 =ALIGNMENT/START,RECALL:A4,LIST=YES ALIGNMENT/TRANS,XAXIS,CIRXY1 ALIGNMENT/TRANS,YAXIS,CIRXY1 ALIGNMENT/END MOVESPEED/ 300*0.9 TOUCHSPEED/ 5 PREHIT/0.05 RETRACT/0.05 CHECK/0.01,1 CIR_B =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,OUT,LEAST_SQR THEO/<0,0,3.3>,<0,0,1>,5.7109,0 ACTL/<0,0,3.3>,<0,0,1>,5.7109,0 TARG/<0,0,3.3>,<0,0,1> START ANG=-120,END ANG=240 ANGLE VEC=<1,0,0> DIRECTION=CCW SHOW FEATURE PARAMETERS=NO SHOW CONTACT PARAMETERS=NO A6 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/LEVEL,ZPLUS,PLN_DATUM_A_SIM ALIGNMENT/TRANS,XAXIS,CIRXY2 ALIGNMENT/TRANS,YAXIS,CIRXY2 ALIGNMENT/TRANS,ZAXIS,PLN_DATUM_A_SIM ALIGNMENT/END LIN_CMM_XP =FEAT/LINE,CARTESIAN,UNBOUNDED,NO THEO/<-0.5,0,0>,<1,0,0> ACTL/<-0.5,0,0>,<1,0,0> CONSTR/LINE,ALIGN,1,XPLUS A7 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES ALIGNMENT/LEVEL,ZPLUS,PLN_DATUM_A_SIM ALIGNMENT/ROTATE,XPLUS,TO,LIN_CMM_XP,ABOUT,ZPLUS ALIGNMENT/TRANS,XAXIS,CIRXY2 ALIGNMENT/TRANS,YAXIS,CIRXY2 ALIGNMENT/TRANS,ZAXIS,PLN_DATUM_A_SIM ALIGNMENT/END
pic2 for group.PNGLast edited by DAN_M; 11-27-2019, 11:10 AM.Comment
-
I feel that this is wholly dependent upon what the part is made from, and the tolerances you are looking at measuring.
If the part is machined, and tolerances are very tight, I would either elevate the part enough to get a probe under it and touch on the actual part to establish A datum, or I would turn the part on its side (using v-block or other methods for mounting), exposing A datum in a TA90Bx probe orientation.
If tolerances are relatively lax, or concern for flatness of A or perpendiularity error projecting away from a are null, then yes touching atop the posts you rest the part on will work just fine.
I typically take 3 hits on the model in manual mode (CTL+F4), then just flip the vector to construct the initial level plane.Comment
-
Need help with something quick..
I need to write the program to/using the CAD file. But, I need to plane off of the 1-2-3 block it is...01-09-2013, 02:17 PM -
Anyone out there want to part ways with their B&S demo block?
Maybe you have an extra one you don't need?
send me a PM
...03-19-2007, 06:56 PM -
I have a rectangular fixture with 4 corner alignment blocks. The fixture is engraved with the coordinates for the outermost corner of each block. For...12-20-2020, 12:58 PM -
All,
Measuring a part, comes within spec. That is while fixturing the part with a vice.
Put the same part on a magnetic...06-01-2016, 01:10 PM -
Ok, so 4.3 is in need of some attention......we reverted back to 4.2 and will wait a while for the fixes.
In the meantime, have you ever...08-20-2008, 03:14 PM
Comment