A true arc turned in to multiple arcs and straight lines

[Anonymous]

I have a tube that I want to mill out the end on.  It is a true radius in SW but HSMXpress insists on putting straight lines on my arc or using multiple arcs to describe the surface.  Tightening up on the accuracy to 0.0002 and applying a 0.0002 smoothing improved the program by reducing lines from several hundred down to 60 or so but HSMXpress still created 3 arc's to describe what could have been done with one and no adjustments to tolerances or using smoothing.

[Laurens-3DTechDraw]

Paul2020 wrote:

I have a tube that I want to mill out the end on.  It is a true radius in SW but HSMXpress insists on putting straight lines on my arc or using multiple arcs to describe the surface.  Tightening up on the accuracy to 0.0002 and applying a 0.0002 smoothing improved the program by reducing lines from several hundred down to 60 or so but HSMXpress still created 3 arc's to describe what could have been done with one and no adjustments to tolerances or using smoothing.

Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens?

[Anonymous]

Laurens-3DTechDraw wrote:
Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens?

I am not sure what you mean?  If you look at feature 2 in the SW part, it is a 3" diameter circle that is doing the cutting.

[Anonymous]

Laurens-3DTechDraw wrote:
Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens?

Ok, I did create a new sketched arc that is the same size and in the same position as the arc on the part and yes, it did just make one G03 move.  I would prefer not to have to create new geometry to get the CAM system to work as expected because our design guys will have to deal with this geometry when redesigning the part and in the full assembly.

[Laurens-3DTechDraw]

Paul2020 wrote:

Laurens-3DTechDraw wrote: Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens? Ok, I did create a new sketched arc that is the same size and in the same position as the arc on the part and yes, it did just make one G03 move.  I would prefer not to have to create new geometry to get the CAM system to work as expected because our design guys will have to deal with this geometry when redesigning the part and in the full assembly.

Understand that but it was to make sure that nothing else is causing this.
I think it's being caused by the two fillets that are in your selecting that you get 3 arcs.
Not sure if there is a way around this.

BTW. Those three arcs shouldn't be a problem during the actual cutting right?

[Anonymous]

Laurens-3DTechDraw wrote:

Paul2020 wrote: Laurens-3DTechDraw wrote: Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens? Ok, I did create a new sketched arc that is the same size and in the same position as the arc on the part and yes, it did just make one G03 move.  I would prefer not to have to create new geometry to get the CAM system to work as expected because our design guys will have to deal with this geometry when redesigning the part and in the full assembly. Understand that but it was to make sure that nothing else is causing this. I think it's being caused by the two fillets that are in your selecting that you get 3 arcs. Not sure if there is a way around this. BTW. Those three arcs shouldn't be a problem during the actual cutting right?

The cut (arc) is made up of almost two hundred G03 and G01 moves.  True, most of which are the beginning and the end parts.  Although I did this with a Fanuc post, we have some older Cincinnati Milacron Sabre 1000's with limited memory and it will not be a smooth execution.  Also, the operator will not be able to understand what he is looking at.  If it was just 3 arcs, I would be good.

I have attached the NC program - it balloons to almost 300 lines for a single arc to be cut.

[Steinwerks]

Paul2020 wrote:

Laurens-3DTechDraw wrote: Paul2020 wrote: Laurens-3DTechDraw wrote: Have you tried making a sketch that is the exact arc? Just for the sake of seeing what happens? Ok, I did create a new sketched arc that is the same size and in the same position as the arc on the part and yes, it did just make one G03 move.  I would prefer not to have to create new geometry to get the CAM system to work as expected because our design guys will have to deal with this geometry when redesigning the part and in the full assembly. Understand that but it was to make sure that nothing else is causing this. I think it's being caused by the two fillets that are in your selecting that you get 3 arcs. Not sure if there is a way around this. BTW. Those three arcs shouldn't be a problem during the actual cutting right? The cut (arc) is made up of almost two hundred G03 and G01 moves.  True, most of which are the beginning and the end parts.  Although I did this with a Fanuc post, we have some older Cincinnati Milacron Sabre 1000's with limited memory and it will not be a smooth execution.  Also, the operator will not be able to understand what he is looking at.  If it was just 3 arcs, I would be good. I have attached the NC program - it balloons to almost 300 lines for a single arc to be cut.

Posted with our slightly modified Haas post (doesn't affect anything here), with Tolerance set to .0001, and smoothing set to .001, but I've set Vertical Lead-in to 0:


O00331 (test)
(T4 D=0.375 CR=0. - ZMIN=-0.375 - flat end mill)
G90 G94 G17
G20
G53 G0 Z0.

(2D Contour1)
T4 M6
S1643 M3
G54
G0 X22.4595 Y-0.0563
G43 Z0.6 H4
G0 Z0.2
G1 Z-0.375 F9.333
G41 X22.5695 Y0.1222 D4 F28.          <-- In Control cutter comp move
G3 X22.2252 Y0.1037 I-0.1629 J-0.1813 <-- Lead-in arc
X22.0735 Y-0.0692 I2.2608 J-2.1366    <-- part
X21.8863 Y-0.375 I1.1962 J-0.9424    <-- part
X21.8862 Y-1.6246 I1.3637 J-0.625    <-- part
X22.125 Y-1.9922 I1.3638 J0.6246      <-- part
G1 X22.2222 Y-2.1064                  <-- this is a little weird, but still part
G3 X22.5658 Y-2.134 I0.1856 J0.158    <-- lead-out arc
G1 G40 X22.4607 Y-1.9527              <-- cancel cutter comp move
G0 Z0.6

M5
G53 G0 Z0.
X11.0625
G53 Y0.
M30

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