Dynamic mill overengaging

[MIL-TFP-41]

I have uploaded a file to the FTP in the mcx4 files folder named "Dynamic overengage.mcx". The material is 304L stainless....we were getting very good MMR (4000 rpm, 120 ipm, 15% stepover) till the program started to clean up around the bosses. I have highlighted the problem areas with red boxes. You could hear and see that the tool was cutting WAY too much...in some cases it looks like it is engaging 50% of the tool. Needless to say we have a few tools that are now in multiple pieces. Am I missing a setting to not allow for this to happen? The tool was cutting very nicely till it came across the problem around the bosses

 

Any suggestions? I am looking into the volumill free trial to see how they are addressing areas like this....

[The_Evil_Machinist]

Ok, the best I could do was deselect optimize cut order and take a smaller bite (10% stepover). It took smaller cuts in the nubs that were formed by the bosses.

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This pic is where your tools were breaking right?

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[MIL-TFP-41]

yup...sometimes the tool would make it through the area ...but break when it got to the next cut.

[MIL-TFP-41]

I finally went to an 8% stepover with optimize deselected....seems to be doing better. Thanks for the input!

[neurosis]

I ran this part through volumill. It did a much better job of keeping the tool from over engaging. It bounced around the part so much and made so many retracts that I dont think that the path is efficient enough to justify.

 

I would be curious to see how the cimco 2d adaptive clearing would fair.

[MIL-TFP-41]

quote:

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I ran this part through volumill. It did a much better job of keeping the tool from over engaging. It bounced around the part so much and made so many retracts that I dont think that the path is efficient enough to justify.

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I am trying the 15 day trial...and found the same thing. No over engaging, but WAY too many rapid moves. note...the part that is on the ftp is a rough model of what we are actually making. The real thing has alot of pockets also. The Volumill pocket toolpath looks good....but then so does the dynamic toolpath.

[neurosis]

Did you talk to Glen about all of the rapid moves? Ive been bugging him about this to see if I can get them to change things where the retracts are concerned. The more they hear about this issue the better.

 

I use volumill on a fair amount of jobs but about 50% of the time I end up ditching the path due to the amount of retracts.

[roccet]

Have you tried updating your volumill? because there are many changes.. Dynamic mill just doesnt "Cut it" for me because of some of the inconsistency in tool engagement. volumill keeps it constant.

[alanu23]

Vericut's optipath could fix that. I tried the varimill trial as well, was pretty impressed except with the retracts. I really liked how the tools slows down in certain places then goes balls to the wall in straight aways...if your machine will go that fast. I am wondering when Mastercam's dynamic mill will start working along those same lines.. Optimizing feeds and speeds based on the amount of material being removed.. Not every pocket we cut is the same depth of cut through the whole pocket.

[Chris Rizzo]

quote:

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Optimizing feeds and speeds based on the amount of material being removed

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mastercam's highfeed does that

[gcode]

quote:

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mastercam's highfeed does that

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I wonder how well??

Mastercam's hi feed technology

predates Dynamic milling by a decade.

 

It would be very cool if hi feed could be

incorperated into toolpaths as an option

without locking the toolpath

 

I also wonder if Mastercam's

dynamic milling is working any

better. There have been 3 MU's released

since this thread was started.

The few times I've used Dynamic milling

it worked very well... but I was doing

very simple stuff with no islands

 

[ 04-30-2010, 01:42 PM: Message edited by: gcode ]

[Goldorak]

as g-code said , i reloaded the file and simply regen the operation without any change with X4 MU3, and i got no over engage, the toolpath is way smoother than in X4