Please help with cavity

[cadmonster66]

Ladies and Gentlemen I posted a file called TEST CAVITY to the ftp i need some help with it.

The rough was no problem but i need a finish path other than the parallel one.

The finish tool i have is a 1.5 dia. insert Ball endmill and i just cann't get the tool to do a radial or scallop tool path form the top to the bottom ( that is the way i would like to machine the cavity )

please help thanks

John

[Scott Bond]

Hi

Because there is . 377 radii in one area of the cavity.---------------

Try a 3/4 four flt finish ball,pocket spiral inside to outside .005 x,y steps with a half dozen finish passes at .002 ,and post.

Project onto your exisitng surfs ,this will give you a useable result.

No draft ?

I know that 4.750 is a little long for a 3/4 ball, so use the four flt because it is a little more rigid.

[cadmonster66]

Scott 1 question,

I'm kind of new to molding I understand what you would like me to do but the pocket command asks me to chain around the cavity (what is the best way to chain the top? How can i set-up the cavity for chain

thanks

john

[cadmonster66]

Scott,

how did you also analyze to find the .377 rad.

thanks

john

[cadcam]

Cadmonster,

Please tell me this is what you want, using a 1.5 ball.

Please look at this Picture link here .

If this what you want i can put this file with this path back on my FTP.

this is scallop using the 1.5 ball at this time with a .05 step over,Started from the top down.

[ 10-11-2001: Message edited by: cadcam ]

[cadmonster66]

cadcam,

Could you please post back the file as test cavity 2.

One problem though i need the tool path to go all the way to the very bottom

thanks

john

[cadcam]

Hi cadmonster,

Just so you know it does go to the bottom.

I stoped to get the picture so ther was know dought that it started from the top and goes down.

Cadmonster this will be MC8 so hope you are running that.

[ 10-11-2001: Message edited by: cadcam ]

[ 10-11-2001: Message edited by: cadcam ]

[Scott Bond]

Hi

Good Morning

Jay's way is answering your question .

"( that is the way I would like to machine the cavity )"

I'm only telling you what I do for this kind of cavity. On the .377 rad question I looked at the part ,and visually noticed that some radii were to small for a 1.500 dia. ball mill and proceeded to find out what size they were. Here is what I did.

put cplane in 3-d,create,curve,one edge,---create ,point along entity =3= ------------

create, arc,3 points,points pick the points. analyze only arcs.-------------------------

Use the same way to create the pocket geometry. But for simple flat pocket geometry I put Cplane: T

[Tim Scott]

Analyze - Dynamic and picking the small radius surface will give you the min radius of curvature.

[Scott Bond]

Willy

Thanks-- That works awsum ! Some features didn't exist when I started ,or I missed it in an update or class. That's what makes this forum valuble to me .

 

"Please help ; I only have a small brain."

[Mark H]

Another way to find the smallest radius on a surface...

Analyze, surfaces, curvature, then select your surface(s) and select Do it. At the bottom of the screen, you will get the largest and smallest radius found.