Surface Finish Parallel not Sizing

[MotorCityMinion]

Version X

 

Two problems with this surface.

 

The first is that it wont size out when I post the g-code. The distance across the green surfaces is 1.215, and symmetrical about the Y axis. I'm using a .50 bullnose with a .125 rad. It should post with y +/- .3575, but I'm checking my extents and seeing .3486? Stock left on drive surfaces is set to zero. Max step over is set to .01, tangential line length set to .25. Corner rads are .25 and .50 in the pocket.

 

Second issue. With depth limits set to -2.28 max, I'm seeing -2.2841 at every approach, and a bunch of x/z taper moves across the bottom. The lower left corner of the pocket starts at X3.4085, Z-2.28, and the .50 rad starts at X4.8184,Z-2.28 on the actual part. The bottom of the pocket is flat. GRRR. Here is the code I'm getting:

 

Could the net surfaces be out of alignment with the wire frame geometry?

 

N985 G00 Z.2443

N990 Z1.

N995 X3.0326 Y0.

N1000 Z-2.1841

N1005 G01 Z-2.2841

N1010 X3.2825 Z-2.28

N1015 X3.4585 Z-2.2771

N1020 X3.641 Z-2.2746

N1025 X3.8351 Z-2.2726

N1030 X4.0556 Z-2.2714

N1035 X4.3118

N1040 X4.5528 Z-2.2726

N1045 X4.7597 Z-2.2755

N1050 X4.7631 Z-2.275

N1055 X4.7817 Z-2.2714

N1060 X4.8006 Z-2.2669

N1065 X4.8195 Z-2.2614

N1070 X4.8384 Z-2.255

 

Close, and looks good machined, but still wrong. Any clues?

 

Thanks for your help.

[Jerosu]

In my experience, parallel will only get as close to the wall as your max step over allows. In other words, all of the stepovers are the same, it stops short of the wall to avoid violating it.

[Dan@clover]

Net surface is not 100% accurate with the geo.

try a different surface and see if you get better

alignment with the geo. I'd try loft or even swept.