Max Inscribed Line

[Tim Q]

Below (and attached) is the image of the box/tab that fits into a slot. I was wondering how to determine the max inscribed width instead of the least squares fit calculated line edge.

[Mike Ruff]

Use a Constructed Width. You will want to select the MAXINSCRIBED algorithm and it should work. See my example below.

LIN2 =FEAT/LINE,CARTESIAN,UNBOUNDED
THEO/<0,0.1,-0.1>,<0,1,0>
ACTL/<-0.0025,0.1,-0.1>,<-0.0003135,1,0>
MEAS/LINE,5,ZPLUS
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,<0,0.1,-0.1>,<-1,0,0>,<0.0001,0.1,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<0,0.8,-0.1>,<-1,0,0>,<-0.0038,0.8,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<0,1.5,-0.1>,<-1,0,0>,<-0.0052,1.5,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<-0.0001,2.2,-0.1>,<-1,0,0>,<-0.0057,2.2,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<-0.0002,2.9,-0.1>,<-1,0,0>,<0,2.9,-0.1>,USE THEO=YES
ENDMEAS/
LIN3 =FEAT/LINE,CARTESIAN,UNBOUNDED
THEO/<2,0.1,-0.1>,<0,1,0>
ACTL/<2.0023,0.0999,-0.1>,<-0.0000188,1,0>
MEAS/LINE,5,ZPLUS
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,<2,0.1,-0.1>,<1,0,0>,<1.9999,0.0999,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<2,0.8,-0.1>,<1,0,0>,<2.0039,0.8,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<2,1.5,-0.1>,<1,0,0>,<2.0037,1.5,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<2,2.2,-0.1>,<1,0,0>,<2.0041,2.2,-0.1>,USE THEO=YES
HIT/BASIC,NORMAL,<2,2.9,-0.1>,<1,0,0>,<1.9998,2.9,-0.1>,USE THEO=YES
ENDMEAS/
WIDTH1 =FEAT/WIDTH,CARTESIAN,OUT,LEAST_SQR,NO
THEO/<1,1.5,-0.1>,<1,0,0>,2.0001
MEAS/<0.9997,1.5,-0.1>,<1,0.0002,0>,2.0052
CONSTR/WIDTH,BFRE,LIN2,LIN3
WIDTH2 =FEAT/WIDTH,CARTESIAN,OUT,MAX_INSC,NO
THEO/<1,1.5,-0.1>,<1,0,0>,2
MEAS/<0.9999,1.5,-0.1>,<1,0,0>,1.9998
CONSTR/WIDTH,BFRE,LIN2,LIN3
WIDTH3 =FEAT/WIDTH,CARTESIAN,OUT,MIN_CIRCSC,NO
THEO/<0.9999,1.5,-0.1>,<1,0,0>,2.0002
MEAS/<0.9988,1.5,-0.1>,<1,-0.0006,0>,2.0099
CONSTR/WIDTH,BFRE,LIN2,LIN3

I took two lines (I used LSQ measured lines. I would guess it will work the same with AutoLines, but I did not confirm this) made of 5 points each on each side of a 1-2-3 block. When it took the 3 middle hits, I stuck a piece of paper in between the tip to throw off the measured values for this experiment. Then I created 3 different widths using these 2 lines- one using LSQ, one using MAXINSC, and one using MINCIRC, and you can see based off the values that these calculations are driven off of the individual hits of the lines, not the averages of the lines.

[Tim Q]

Mike Ruff - That's great! I really appreciate the help and time you took to answer this.

[Mike Ruff]

No problem! Glad I could help