gouging PLEASE HELP!!

[mktchevelle]

I am having a problem when filtering surface toolpaths. When cutting a u-shaped cavity with a ball mill or a male radius my part will be gouged in some places. In some cases the arcs are not broken and the machine cuts a 360 arc in my xy or yz plane. This only happens when using the filter option. I have tried changing my filter tolerances but this hasent helped. The part I scraped today has about a .01 gouge in the center of it. My CD is set to break arcs at 180. When I run verify the parts look great so I am assuming it is in the post somewhere.

[Midwest]

"My CD is set to break arcs at 180"

 

Try quadrants

 

 

What post are you using?

 

What machine are you posting to?

 

What tool path are you using?

[mktchevelle]

I have tried breaking arcs at quadrants and I get the same results. I have the same problem with flowline or parallel. I am running a haas using the mphaas updated from 9.

[Greg Williams]

You need to set the arccheck in the post

 

Look for something like this

 

arccheck : 1 #Check for small arcs, convert to linear

ltol : .002 #Length tolerance for arccheck = 1

atol : .01 #Angularity tolerance for arccheck = 2

vtol : .0001 #System tolerance

ltol_m : .0025 #Length tolerance for arccheck = 1, metric

vtol_m : .0005 #System tolerance, metric

[Allan]

Try the Mpmaster from this site http://www.emastercam.com/posts/mpmaster/index.html

It will work well on your Haas .

 

Make sure that your up to date on Mastercam as well, you should be running MR1 or SP2 depending on your maint status.

 

Allan

[AllenT]

Did you gouge check the surfaces with STL file?

[Hardmill]

Could be a parameter on your machine, may need to loosen your arc tol a bit.

 

I have seen this several times b4.

 

 

PEACE

[HevyMetl]

What are your filter settings at? If you are cutting a surface sometimes the filter will "gouge" the part if the settings are set to large and it can convert some of your motion to different size arcs.

 

I never use filter and I set my tolerances small when I need an exact rep of my surface and excellent surface finish for my molds.

[PORT]

It is not in the machine 99% of the time my finishes are good. I usually set my filter at 2:1 total of .0002. This is a large gouge about .005. I am running SP2. This is just a ruled surface using two 180 arcs about 5" apart. My code should output all arcs.

[HevyMetl]

Just for tickles and grins pull remove the filter and set you overall tolerance to .0001. This should output only linear movement. I know the code will be much longer but it will show you if it is a filtering error.

[PORT]

I have posted with my tolerance at .0001 with filter off and there is no gouge. The only problem is I must slow down my feed at the machine or I will get a bad finish.

[HevyMetl]

Are you having to slow down the machine, because you are drip feeding? Are you slowing down because the machine can't process the data from the control fast enough? Or is the machine just not capable of your surface finish requirement? The last question was the case with out Fadal's. We just had to slow the feedrate way down to get a decent looking part. The machine/control could not accel decel fast enough to maintain the tolerance we needed. I ended up never violating the 40 ipm rule with the fadal's on surfaces an it worked pretty well. You just were never able to reach the sfm the endmills required and their lives were sacrificed accordingly.

[PORT]

The machine dosent have hsm option so when cutting from point to point I get a poor finish that is why I need to be able to filter.

[HevyMetl]

I understand, but filtering will compromise your surface finish. You will have to play with the settings to get you the best finish you can at the speeds you can run on your machine.