Surfacing leaving material

[Mic6]

I'm trying to surface finish parallel. The corner you see is the downslope and it goes up to the right. I've tried offsetting containment, changing the machining angle and a bunch of other junk, and I can't get the tool to remove the little bits of material you see in the corners. I created a hole fill surface in the open area as a check surface, but that level isn't visible. Any ideas why it's not cutting up to the edge in the corners? TIA

 

[K2csq7]

What happens if you omit the check surface, drive only? It looks to me that it is trying to avoid something.

[Mic6]

Drive only it dips into the open area, cuts to deep in those corner areas.

Under

Finish Parameters>Adavnced Settings>at solid face edge roll tool, I've tried all 3 options without a check, and it dips into the open area. The only way I've made it work is to create a surface over the entire open area, and finish all that air, but that's a waste.

[strabe]

Can you extend the surfaces in those areas? That will force the tool to extend over the edge without dipping down.

[Toonz]

What size tool are you using?

[Mic6]

quote:

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Can you extend the surfaces in those areas

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Didnt think of that...

 

I'm trying a .250 and .125 bem, same results. .250 is shown

[K2csq7]

Gap Settings...

[Mic6]

quote:

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Gap Settings...

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Tried that as well

Using Optimize Cut Order and Motion Smooth. No change

[Jmick]

Drive surfaces only with boundary?

[Tony35]

what is your containment set at? inside,center,outside

[Ocean Lacky™]

quote:

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Drive surfaces only with boundary?

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What Jmick said!

[Mic6]

Yes, drive surfaces only

 

I'm not using containment. Just check to kep the tool from dipping into the open area

[Mic6]

Treid a 5/64 bem and it was even worse. uggh Still trying stuff

[Colin Gilchrist]

Do this, keep your boundary at the edges of your walls. Un-trim and extend your surfaces way out so they prevent your tool from dipping down. Use a containment boundary and keep the tool "Center"...

[Colin Gilchrist]

What about trying Surface High Speed Raster?

[Mic6]

I'll try all of this and get back in the morning.

[Ocean Lacky™]

If the surface you're trying to cut is flat or a single surface, ie. a flat boundary type entity, just select the one surface as drive and no check surfaces. Use edge curves for containment. Use cut extension parameter to extend cut beyond surface edge.

 

I'm thinking it's the check surfaces that are limiting the cut. Also, selecting the vertical surfaces as Drive will cause the tool to roll over the edge.

 

Not at work now, so can't test this theory....

[MotorCityMinion]

From the looks of the pic, nothing protrudes or is tangent to the mounting face so I'd say try:

 

Gap settings, tangential line length, add about .05.

 

Advanced, only between surfaces.

 

Zig Zag if possible to keep the tool down.

 

Raster kinda sux IMO. If I had to monkey with different tool paths, I'd try SF Blend with the across option, or projection.

 

Extending the surfaces seems drastic in this case.

[Matt Berube at Ferron Mold]

I'd use Surface Finish Shallow and restrict the depths enough to keep it out of the deeper areas. All surfaces drive, no check surf.

 

Another thing you could do is Xform Translate your check surface down .010 or so which would probably allow the SF Parallel operation to work... I really prefer "SF Shallow" though.

[Redfire427]

It is your gap setting. Set it at something like .5 and in the box below it, select- follow surface edges.

[Mic6]

Awesome ideas, been thinking about it all evening! Thanks guys, I'll let you know what happens.

[Mic6]

Prosin, I tried gap settings @ .5 to .7 and followed edges. It looks like it helped a bit. The Gap settings are shown in the first pic. The second pic shows what the toolpath looks like with out a check surface filling the inside.

 

 

 

Without a check surface, the toolpath dips in and gouges the edges that are parallel with the cut direction.

 

But the corner details that are perpindicular to the cut direction are cut nicely.

 

Thanks for all the help so far

Still trying...

[Thee Rickster ™]

Try moving your check surfaces down .02 or so.

 

Then adjust that depth if it dips.

[Mic6]

Hey Minion, that seemed to do it. The Tangential line length. It cuts a bit of air, but I'll tweak it some more, but hey, it cleans up 100% Thanks again everybody. Man I love this place

[MotorCityMinion]

Cool. Ocean Lacky gets some of the credit also as I believe he was thinking along the same lines with "cut extension parameter".

 

Checks and boundaries are usually not required on a TOP surface like that with SF Parallel. Since the holes are filled and I don't see any islands or bosses in the vicinity, I didn't think there was a need to mess with the default "300% of step over" in the gaps settings.

 

BTW, I set all my surfacing op defaults to "Advanced, only between surfaces" then tweak if necessary. I found that with most of the surfacing tool paths that I use, that setting wins out the majority of the time.

 

If ya don't mind, post a pic of your tool path and what setting were used so that others can use benefit as well.