VERICUT Users' Forum

Roger Bombassei

Member

From: Babylon, Long Island

Registered: 2006-08-02

Posts: 75

Autodiff False Gouges

Good morning guys.
I've been having trouble with Autodiff showing an outrageous number of false gouges.  Even when I set the tolerance to .01.  I know that it is common to get some false gouges, but I'm talking about 1000s.  I normally will go through and verify them all visually, but there are too many.
I'm using CATV to create STLs from CATIA V5.  Are there settings to help this problem?
This part is a about 6' x 10' x 8" with approx. 100 pockets and ML along 2 sides.

Any suggestions will be greatly appreciated.

DaveF

Senior Member

From: Valencia, CA

Registered: 2005-08-20

Posts: 304

Re: Autodiff False Gouges

Hey Roger

Check out help on the new constant gouge in Vericut 6.0

it will allow you to shrink all tools by .001 .002 whatever, and than you will miss the high spots on the stl facets.
this is part of autodiff

Or, in Vericut 5.4.x,  take the tool list and lie, make the 1.000 cutters  .998 and move the gage point drive

send me a PM & I will give you my number & I'll talk you thru
dave

---

Dave Frank
Aerospace Dynamics International, PCC
Valencia Ca
"Where else can you have this much fun,.......and get paid???."

DaveF

Senior Member

From: Valencia, CA

Registered: 2005-08-20

Posts: 304

Re: Autodiff False Gouges

New AUTO-DIFF Constant Gouge Check (CGC) is implemented in V6.0. It uses an approach very different from the pre-6.0 CGC.

1.      How it works:

When CGC is on, on each cut VERICUT internally creates a new “virtual” cutter which is smaller than the actual cutter by the CGC tolerance. The virtual cutter is defined by a profile that is the actual cutter profile offset inward by the CGC tolerance.

For each cut, VERICUT creates a trajectory volume for the virtual cutter and checks for intersections between the trajectory volume and the design model. The area of the design inside the trajectory volume is “permanently” colored by error color and carries a history information about the cut causing the collision. Note that the error area on design represents collision area with the CGC tolerance subtracted from the cutter. The actual collision area is bigger by CGC tolerance. An error message indicating tool/design collision is put into the logger.

Holders are not included in the check (holder/stock collision is a different type of error).

When CGC is on, design model is always displayed in the Workpiece view (even before the cutting begins) and is measurable by X-Caliper. When you click on the error area on design using Feature/History tab in X-Caliper, it gives the information about the culprit cut.

2.   GUI changes:

CGC-related widgets are moved from AUTO-DIFF > Options tab to the new “Constant Gouge Check” tab of the AUTO-DIFF window:

The color choice list associated with CGC (present in V5.4) is removed altogether (the CGC error color = VERICUT error color). Clicking “On” toggle turns CGC mode on/off right away. You don’t have to push “Apply” and, in fact, “Apply” is disabled along with all the other content of the AUTO-DIFF window except for the “Close” button. Turning CGC off will remove the error marks on the design marking tool/design collisions occurred to that point. Because the error marks are permanently removed, a warning message pops up asking the user to confirm it.

CGC is mutually exclusive with the normal AUTO-DIFF. To do the normal AUTO-DIFF, one has to turn CGC off. If normal AUTO-DIFF is done, one has to click “Restore” button to be able to turn CGC on.

3.   Differences with pre-6.0 CGC:

Many. The main 2 are:

a.      No solid model is built from design model in V6.0. Hence, big memory savings. Also, that’s why the CGC results in V6.0 are practically independent of Cut Tolerance, so a pretty large Cut Tolerance can be used to detect any gouges.

b.      In V6.0, the CGC tolerance is applied right away. In V5.4, VERICUT first detects a possibility of tool/design collision without taking the CGC tolerance into account, and then asks user to do AUTO-DIFF process to decide which collisions are truly outside the tolerance.

---

Dave Frank
Aerospace Dynamics International, PCC
Valencia Ca
"Where else can you have this much fun,.......and get paid???."

Roger Bombassei

Member

From: Babylon, Long Island

Registered: 2006-08-02

Posts: 75

Re: Autodiff False Gouges

Hi Dave,
I did something similar by adding .002 to all the walls and floors in the intire program but I still got too many gouges.  You'd think setting the tolerance to .01 would take care of that anyway.  Some of the gouges say they are 1.5 out of tolerance in the report, but when I stop Vericut and zoom in on the gouge, it's just a small red spot.
I'm using Vericut 5.4.  Most of the gouges seem to be in the fillets on the floors and in the corners.  It seems like the STL file is bad.  All of the cylinders seem wavey.  I'm just guessing.

I have no idea when Monitor will move to 6.0.  I'll find out next week, I'm about to hop on a plane to SoCal for the weekend.

Thanks for the reply.  This is my first time using this forum.  But you know I'm a heavy forum user.  8)

DaveF

Senior Member

From: Valencia, CA

Registered: 2005-08-20

Posts: 304

Re: Autodiff False Gouges

sound like the stl is crap  :cry:
zoom in on a corner & find out if it really is crap.
mabey the catia settings were wrong. .01 on 2d not 3d?

you could also try converting an IGES into a PLY file using Vericut file+convert.

there is a tolerance setting there.
In Earth inches.  ( old joke, don't ask)

also what is you file + Properties cut tolerance set to?  stock size or tool size? and what is the cut tolerance?

Have you ever seen the messages when you start.. Based on RAM the tolerance is set by Vericut to .0136 or something like that?

also, If you start Vericut and then open other software, that may gobble up the RAM Vericut needed.

this is key:
a. No solid model is built from the design model in V6.0. Hence, big memory savings. Also, that’s why the CGC results in V6.0 are practically independent of Cut Tolerance, so a pretty large Cut Tolerance can be used to detect any gouges.

I been waiting for this for a while. Very happy.
           

for V6 you dont need to go in cold turkey. start with CGC& STL only 1st

There is a lot of good NEW stuff but things moved around & will take a little getting used to it, but not too bad.

they made good help files, and even a video on the install dvd

I am starting the crew with CGC 1st....because it solves the issue you raised. Autodif & large aerospace parts :wink:

welcome to MY forum.
At least on this forum, I answer questions more I ask. Not like on your forum  Heh heh heh  :twisted:

---

Dave Frank
Aerospace Dynamics International, PCC
Valencia Ca
"Where else can you have this much fun,.......and get paid???."

Roger Bombassei

Member

From: Babylon, Long Island

Registered: 2006-08-02

Posts: 75

Re: Autodiff False Gouges

Thanks Dave, I'll have to try some of your suggestions on the next part.  This one is going to be verified on the machine.