AUTO-DIFF

EngMfg1 · 2005-11-09 00:38:10

Hi all

I am getting a message the AUTO-DIFF aborted can anyone let me know why this might happen

Thanks all

DaveF · 2005-11-09 16:29:44

It sounds like RAM & File properties tolerances.

Based on files size, you may need 2 gig of ram. I actually have 4.

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

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

There is a Autodif by area that can help with this. Along with many other solutions.

Before you go there I would try this 1st:
------------
Reboot the computer to clear cache

Run Vericut by itself and see if Autodif runs OK

If not, reset file +properties +cutting tolerance to a large number .010-040.

Check stock size box, not tool size [ ]

I am doing a big, nasty part 20 x 40 x 80, and .020 is good enough to see .001 gouges.

Those tolerance numbers are not thousands of an inch.
It?s some unknown ratio on another planet.

Test that number by intentionally undercutting your part by .001 (Earth inches) deep with a .060 ball end mill, and see if you can find it with Autodif

If you describe what you are doing, maybe I can give you other Ideas.

Hope this helps

Dave

EngMfg1 · 2005-11-09 18:15:46

thank you sir, that work perfect, By the way I almost worked for you guys about 8y ago........

thanks again 8)

BillH · 2005-11-11 22:12:28

Mars to earth, mars to earth, come in please...

It may be helpful to know what the Cutting Tolerance number is. Maybe this will help (maybe not). The follow discussion depends on setting Cutting Tolerance to "based on Stock Size" (more on that later).

VERICUT is a 3D system. When it removes material, it removes a "volume" of material (i.e. a closed 3D shape).

The cutting tolerance number is the smallest volume cut VERICUT can detect, "measured in any direction". I know, you're thinking, "What the heck does this mean? Is he speaking Martian again?"

Try this specific example. Imagine a full width cut by a flat bottom 1/2" end mill, gouging a channel across the top of a block. Imagine it gouges .001" axially into the block, and travels 2" in X. Thus the gouge is a volume that is .001 x .5 x 2. How big is this gouge? .001? or .5? or 2?.

Let's make another gouge. This time lets take the same end mill, and gouge the side of it into the side of the block by .001", and 2" axially deep. So now you have a gouge that is .001 x 2 x .0447. But it is not a nice rectangle, it is a small chunk of a cylinder. Again, how big is this gouge? .001? or 2" or .0447". It is complicated by being only .0447 at the exact intersection of the block and the cut. Deeper in it narrows, all the way to zero at .001" deep.

But the direction you want to measure the gouge doesn't matter, since typically VERICUT can detect these gouges as long as it is larger than the Cutting Tolerance, "measured in any direction". Thus the .001 x .5 x 2 end-gouge is easily caught, even with a relatively large cutting tolerance. The side-gouge is a little harder to find because of its shape and much smaller volume, but still relatively easy to find, because it is large in some direction.

Picture similar gouges with ball end mills or other tool shapes, and you get the idea of what we mean by "volume" of the cut.

The most difficult gouge for VERICUT to detect is one that is not very large in any one direction. Imagine a gouge produced by a ball end mill that just "dimples" the part with a motion along the Z axis. For example, take a .5" ball end mill that gouges the top of the block only axially along Z by .001". It makes a spherical volume that is .0447" across, but only .001" deep. So the volume is very very small and does not span much distance, especially as you move away from the exact centerline of the cut.

I don't know if all this blabber helps you set Cutting Tolerance any better, but hopefully it gives you some idea of what Cutting Tolerance means to VERICUT.

You should have some confidence to set Cutting Tolerance larger than the gouges you are trying to detect. How much larger is a difficult call, since it is measuring a volume, not a chordal deviation. Even on Mars this is a difficult ratio to detemine.

There's a better discussion of Cutting Tolerance (and the meaning of Stock Size vs. Tool Size) in the latest VERICUT 5.4.4 help, in the reference section for File > Properties. This was updated recently in the 5.4.4 help.

I'll go back to my home planet now.

Bill

DaveF · 2010-10-06 18:28:29

Zac take a look at this thread too.

WOW it's hard to beleive it was Nov 11, 2005 , since I was on Mars
Dave

DaveF · 2016-02-19 18:50:54

Hi

Here is a good thread on Autodif
There is a search utility that show other threads.
If you still have a question, please don't hesitate to ask

Dave

VERICUT Users' Forum

#1 2005-11-09 00:38:10

AUTO-DIFF

#2 2005-11-09 16:29:44

Re: AUTO-DIFF

#3 2005-11-09 18:15:46

Re: AUTO-DIFF

#4 2005-11-11 22:12:28

Re: AUTO-DIFF

#5 2010-10-06 18:28:29

Re: AUTO-DIFF

#6 2016-02-19 18:50:54

Re: AUTO-DIFF

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