Crash!?! in pockets

[specprogrammer]

V.8.1 I'm milling a pocket using depth cuts, and leaving stock on the walls and floors. The tool roughs out the first depth of the pocket, and as it goes to the next depth level, it moves in rapid instead of the plunge feed. The mat'l is graphite so I'm just plunging instead of ramping or helix. Am I just leaving something out or is it required to ramp or helix?

[robk]

Do you have your rapid retract unchecked? If so do you also have retract & plunge values for your tool?

 

 

Rob

[specprogrammer]

I had rapid retract checked. Un checked it and the post is the same.

[specprogrammer]

The retract and plunge values are set in the tool params. Is there somewhere else I need to define?

[robk]

How about the tool paramaters....

 

quote:

---

do you have retract & plunge values for your tool ?

---

Rob

[robk]

When you backplot, what are you getting for feeds on the bottom of the screen?

 

Rob

[cadcam]

Are you using a Abs or Inc setting in the other plans?

 

Were is the Z0 the top or bottom of the part?

 

Can you share the file that this happened with to review your settings?

[cvomooney]

I have experienced the same thing...if you have the box checked "enter on first depth cut only" and "plunge after first move" it will plunge at rapid feedrate after the first feed move. I broke a 1/2 endmill in a stainless steel part doing this.

 

cvomooney

[specprogrammer]

At first i had the rapid retract checked... Un checked it and posted ...got the same thing ..checked it again and now its posting right . I dont know if I did something else in the process, But all is ok now. Thanks for the help.

[specprogrammer]

Using abs for clear/retract and inc for feed plane

[Chuckles the Clown]

There is also the handy function that if checked will plunge if the ramp dimensions are too large for the pocket to accomodate.

 

Crunch!...keep an eye out for that too.

[Scott Bond]

For process of elimination only::

Make the clearance plain higher that the stock.

Make the top of the stock the top of the part.

make sure that the z depth is lower than the top of the part.

Set every thing to absolute.

don't check use clearance only at the start and end of operation.

no rapid retract.

On last page. use zig zig,the step overs, and rough angle,and nothing else,,,It will work.

Then play with ituntil you get what you want.

 

Programmer teh' ""No Cash in pockets""

 

[ 09-15-2003, 08:03 PM: Message edited by: Scott Bond ]

[P_Scott]

specprogrammer,

 

Use Scott Bond's advice for programming the pocket. The part about "using clearance only at the start and end of the operation" isn't available in V8, only V9. You should at least update your V8.1 to V8.1.1, which was the last point release for V8 and it contained some bug fixes that may fix your problem. Jay (aka CadCam) asked if you could share the file. Allowing the file to be read by others on the forum is a great way to get more specific technical help because then others would have your file to look at in Mastercam and may see something that you've overlooked. Some companies are proprietary with their files so if that's the case simply say you can't release the file and then it won't be asked for again. The Incremental Feed plane value allows the tool to rapid from the Clearance until just above the previous depth of cut, by whatever positive value you've placed in that field. If the Feed plane value is 0.0 it will rapid right to the current depth of cut or below it, for negative values. HTH

 

[ 09-16-2003, 09:01 AM: Message edited by: Peter Scott ]