Cutting Tolerance & Error Volume

zac · 2010-10-05 18:16:35

Hello All:

I would like to know how everybody else use Vericut and if you don't mind kindly answer the following questions. Thank you.

Q1) What value of 'Cutting Tolerance' do you use when verifying a finishing operation and based on what, 'Tool size' or 'Stock size' ?

Q2) What value of 'Minimum Error Volume' do you use when verifying a program?

:? (Both these settings are found under File> Properties> Tolerance Tab)

Thanks again for your kind responses.

Best Regards,

Zac.

stpendl · 2010-10-06 11:13:13

We use the following settings, which are the default ones, I think.

[attachment=0:2cnb6pjg]Tol_Props_JH.png[/attachment:2cnb6pjg]

zac · 2010-10-06 11:29:53

Thank you for the reply stpendl.

Just out of curiosity, which unit system do you use 'mm' or 'in' ?

Regards,

Zac

stpendl · 2010-10-06 13:37:37

We are using metric units.

DaveF · 2010-10-06 15:43:15

We always use stock size, not tool size for tolerance calculation.
That makes things more predictable for us, to get similar results with the same settings, on the aprox same size parts

Dave

zac · 2010-10-06 16:31:24

Thank you all for your kind replies.

Dave:

Would you mind sharing the actual values of those two settings that you/your company use.

Thanks.

Regards,

Zac.

zac · 2010-10-06 16:38:28

By the way I / we use :

1) .005" (for finishing) and at times if that's not possible relative to the size of the part would go to the minimum limit that Vericut recommends based on the available resources (RAM) once I/we hit apply with .005" entered in the 'Cutting Tolerance' field based on the 'Stock Size'

2) .002" and if the carried over cutstock is clean ( without any free standing stock particles in the air inside the cutstock) then would shoot for 0.0

Best Regards,

Zac.

DaveF · 2010-10-06 18:00:45

OK ZAC
good questions,

Re:Cutting Tolerance.

With 64 BIT and 8 gig or RAM, I now set .005 to .010 Cutting tolerance. I also look at those messages.
But even with that, I ALLWAYS make a run with CGC (Constant Gouge Check), because CGC is not dependent on Cutting Tolerance.
I have done testing to see things and you can also.
Here is a recipe:
In CATIA, Make a 6 inches X 3 foot X 12 foot pad
Make a pillow like surface and split the pad.
Now take various endmills. .060 .05 1.00, ball end mills, bull nose end mills
Make gouges .001, .002 .003 etc in the floor, AND THE WALLs
do this with different tool axis.
Now with the knowledge of what gouges are really there, see what you see and dont see, with different Cutting Tolerances

Now 5 years ago, I did testing on an actual part. This was a very large and complex part, say 24 x 45 X 70 earth inches part, with 90 pocket, and nothing flat anywhere. We only had 32 bit back then, and limited ram because of it. I made gouges with a .060 ball end mill. I was able to see all .005 gouges, with a .030 cutting tolerance setting. .030 was as tight as I could get it. BUT some of the .002, .003, 004 gouges were missed. And the shallower the gouge, the fewer I saw. That is where autodiff by region comes in. And I have a few other tricks up my sleeve as well.

So, testing on an actual part, is the best way to understand how Vericut reacts. As I used to say, the best way to see something, is to LOOK AT IT.

CGTech has a simple program that does testing for autodiff. Send a email to support at CGTech dot com, and if you are currently on maintenance, ( which everyone should be) they will probably send it to you. CGTech is a company that really goes the extra mile, to educate the users. not a dig, but look at VUE. CGTech goes from city to city every year, putting on a training, and what's new seminar. Its free to users. .....Imagine Dassault doing this ?????. yeah right. Free COE conference coming to a city near you. I'm holding my breath, I'm turning blue , I'm turning purple, someone call an ambulanâ€¦.. ahhhhhhhhh. Thud.

Ok OK reel me in.

For Minimum Error Volume...

. this may surprise you ...... I use .000001
remember, it is Volume. So if you want to see a .01 X .01 X.01 cube of material, and have it register, thats .000001
Now, the Vericut geniuses, (or is it geniusii?. more than one Vericut genius) ... the can elaborate more on effects like a .001 deep X .040 wide X .025 tall ding. I am thinking it is the same .000001

What happens to an error? It always paints the part red, but not always stops when you have stop on errors checked. Or shows up it the log and logger. That is what Minimum Error Volume is for. So you can stomp on the small shanking errors when you know it's OK.

As far as I know, Minimum Error Volume has nothing to do with AUTODIFF, that is what Cutting Tolerance is for

OK Bill or Serge, did I get all that right?

Best Regards

Dave

PS say hi to the Beachman for me.

zac · 2010-10-06 18:39:12

Thank you Dave for that detailed reply.

Regards,

Zac.

DaveF · 2010-10-06 19:08:21

no problem.

Now take a look at the 4 most recent posts.
I tool a bunch of old threads, the cream of the discussion, and rose them to the top.

Dave

zac · 2010-10-06 19:32:24

Great work Dave, all those posts have a good amount of useful information. Thanks

Regards,

Zac.

SergeV · 2010-10-06 20:08:14

good answer Dave.

DaveF · 2010-10-06 20:11:29

Ahhhhhhhhhh
I can sleep tonight.
Thanks for taking the interest.

Dave

VERICUT Users' Forum

#1 2010-10-05 18:16:35

Cutting Tolerance & Error Volume

#2 2010-10-06 11:13:13

Re: Cutting Tolerance & Error Volume

#3 2010-10-06 11:29:53

Re: Cutting Tolerance & Error Volume

#4 2010-10-06 13:37:37

Re: Cutting Tolerance & Error Volume

#5 2010-10-06 15:43:15

Re: Cutting Tolerance & Error Volume

#6 2010-10-06 16:31:24

Re: Cutting Tolerance & Error Volume

#7 2010-10-06 16:38:28

Re: Cutting Tolerance & Error Volume

#8 2010-10-06 18:00:45

Re: Cutting Tolerance & Error Volume

#9 2010-10-06 18:39:12

Re: Cutting Tolerance & Error Volume

#10 2010-10-06 19:08:21

Re: Cutting Tolerance & Error Volume

#11 2010-10-06 19:32:24

Re: Cutting Tolerance & Error Volume

#12 2010-10-06 20:08:14

Re: Cutting Tolerance & Error Volume

#13 2010-10-06 20:11:29

Re: Cutting Tolerance & Error Volume

Board footer