Unmachineable region in 2D-Pocket??

[kwolf]

I have a problem in 2D-Pocket.I did a 2d-pocket to a dxf imported file (a tiny true type font text converted to dxf), after verification I discovered that a region in pocket left unmachined .I tried different strategies(zigzag-const overlap spiral ..) with no success.I increased number of finish pass.Finally I decided not to use finish pass and it did a correct 2d-pocket.Actually I tested it with latest patch 10-16 with the same result.

what causes such a problem.

Would I upload the file to ftp ?

Any help or suggestion?

Thanks

KWOLF

P.S :I made a solid from the text and did a 3d-pocket to it without any problem (with the same parameters :tool -stepover-and finish pass spacing ...)

Another question : : When I press Alt-V it shows 5.1.2001 but I just downloaded latest updates . How come?

[ 11-01-2001: Message edited by: kwolf ]

[Allan Brown]

Alt+V gives the main executable date. The updated Surface Machining patches are *apps* patches. When you process a surface toolpath, you'll see the newer date.

[kwolf]

Thanks Dave,

I uploaded the zip file containing 2d-pocket operation to CADCAM ftp site named

"2D-POCKET-PROBLEM.ZIP".

Would anyone have a look at it?

Thanks.

[Fred from Université de Sherbrooke]

I looked at your file and the first thing I saw is that your tool is too big to cut it. You have 2.8" between "e" and "s" your tool have a 5"dia.

[kwolf]

Hi Fred,

Actually the units are in mm.The bigger arc has 150 mm radius and the other has 60mm.And the only region left unmachined is within the upper part of letter "S" and not between "S" and "E".

If you use verify option in backplot command , you will see a tiny piece of pocket in letter "S" won't be cut.

Moreover I make solid from these letters and from the frame , and MC cut it correctly.

I upload the jpeg file of backplot to the ftp site (in mc8 folder) and show the unmachined region.

Thanks for your reply.

KWOLF

[ 11-01-2001: Message edited by: kwolf ]

[ 11-01-2001: Message edited by: kwolf ]

[Fred from Université de Sherbrooke]

Oups, I just saw it...

The only thing I've changed is "roll cutter around corned->sharp" and it work. But, yes, it's pretty strange...

[kwolf]

Hi again,

CADCAM/Jay I hope you are in the forum. Will you please have a look at the file?I'm in a hurry 'cuz there are a plenty of files like 2D-POCKET-PROBBLEM in the hand.

Thanks

[cadcam]

Ok i will look at right now.

[kwolf]

By the way have a look at jpeg file.

Does your backplot look like that?

[cadcam]

Ok this what i have now.

Picture link

[kwolf]

Hi Jay,

How could you get that picture?

Did you change any parameters in 2D-Pocket?

I played with all parameters in 2D-Pocket,none of them resulted in a correct toolpath except unchecking finish pass.

Will you tell me what options you checked and what options you unchecked?

Or better may I download new MC8 from the ftp?

Thanks

KWOLF

[ 11-01-2001: Message edited by: kwolf ]

[cadcam]

I am coming give me a minute sir. thanks jay

[kwolf]

Dear Jay,

I'm waiting for you.I searched the ftp site but did not find new MC8 file for 2D-POCKET-PROBLEM.

In what folder did you upload it?

[cadcam]

Sorry sir it's there now.

It is the one not zipped up.

[ 11-01-2001: Message edited by: cadcam ]

[Tony]

Ahh yes, It Wasnt to long ago we were all at one time in KWolf's shoes...

Only there was no users forum. Just a telephone and it was nowhere near my P.C.

[kwolf]

I'm totaly confused.

Did you do 2D-POCKET in ver 9 and save it as ver 8?

My file has the same parameters as yours but the result is not the same.

[kwolf]

Besides , when in your file I select 4 finish pass , again that problem occurs.

[kwolf]

Ok at least I found one option that differs:Roll Cutter ...

But for 4 finish pass the tool does not have a roughing pass and only 2 finish pass in the region.

I think it must plunge to that area do a rough and 4 finish passes.

[ 11-01-2001: Message edited by: kwolf ]

[cadcam]

Ok now,

that you have foght with your self is it working or do i need to followup.

What you found is the only change made.

If you would like me to try some thing else please let me know.

[kwolf]

Thanks Jay,

I never imagined that such a change in smoothing toolpath has a great effect on it.

And yes if you don't mind , will you use 2 or higher number of finish passes and let me know why there is no roughing or plunging in that area.

Thanks again

KWOLF

[kwolf]

Hi Jay,

I hope you find out why the toolpath looks like this (with 2 or more finish passes).Actually in another software when the stepover of roughing pass exceeds 50 percent of diameter it states that the tool may not clean out pocket.So I decreased the stepover and use 2 finish passes , and again the same problem.

And worse than that is the tool moves in the previous cleaned area very much.

I will be very thankful if any comments or ideas

Kwolf

[mcrae_andrew]

KWOLF- Better watch out or Jay is going to send a virtual invoice direcly tied to the number of posts that request his response. I know the shop I worked at had a sliding rate depending on the level of hassel the customers gave.

I might suggest additional training or even have a consultant spend a day with you to go over some of the implementation issues you face. The pay back will be short as witnessed in you latest crunch.

Andrew