Lines in Finished work

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Lines in Finished work

Postby drawersbydesign » Tue Jan 30, 2018 7:16 pm

I am new to the Forum so you will have to excuse me if this question has already been discussed. I have the Nebula router with the Air cooled Spindle. For my deign software I use Aspire by Vectric, My Question ... When I am doing a finish pass on anything 3D it leaves lines in the finish work, I will attach some pics of past projects. Here is what my settings are and what i'm using:
using 1/8"Ball Nose W/stepover .0075 or 6% ( I have tried almost everything from 4% - 12% Stepover with same results)
spindle speed 16000 RPM
Feed Rate 30.0 inches/Min
I am using raster (but I have tried Offset)
On the Roughing Machine Toolpath, on my Maching Allowance I generally have it set at .03
the diamond shaped pictures are on Soft Maple and the pic of the dog is in Alder

any ideas what I could do or is this typical? any advice is helpful - thanks
Attachments
IMG_4027.jpg
diamond close up
IMG_4025.jpg
dog
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Re: Lines in Finished work

Postby Pete Cyr » Tue Jan 30, 2018 7:36 pm

1/8"Ball Nose W/stepover .0075 or 6% Those are good values

I would decrease speed to 12K vice 16. You are probably creating dust as you cut vice chips

The appearance is not normal and indicative of a problem.
- Either your roughing pass is creating defects that are not cleaned up by the finish pass (is your roughing pass being cut with the same bit you use for a roughing pass - is you gantry deflecting during the roughing pass)
-or your bit/gantry is deflecting during you finish pass
-or you model has defects and you finished carving is an exact copy of a crummy model
-you router is not securely mounted


Something is flexing or shifting as you cut
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Re: Lines in Finished work

Postby drawersbydesign » Tue Jan 30, 2018 9:48 pm

For my roughing pass I use A 3/16 End Mill bit
when I have watched it, I can definitely see that it is removing material on the finish pass.
the work piece is securely mounted to the table - I will double check the router but I am inclined to say it is secure.
I am wondering about the model/design... it is one I did myself, I am new to this so this may be a stupid question but ... If I cant see anything in the design when I look at it/view it in 3D how else would I know if its in the design? any videos or tutorials that you can think of that may help with making sure its a good design?
thanks for your help
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Re: Lines in Finished work

Postby Rcnewcomb » Tue Jan 30, 2018 10:44 pm

When I am doing a finish pass on anything 3D it leaves lines in the finish work


To me it looks like there is some play, binding, or looseness in the Z axis.
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Re: Lines in Finished work

Postby Leo » Tue Jan 30, 2018 11:49 pm

I also vote on something loose in the machine.

I looked at the ProBotix Nebula machine and they don't say much about the guides. OK I just noticed they are round guide rails. Check alignment and adjustment of the trucks on the rails.

Check the adjustability of the guides - they might be too loose. Check all 3 axis's

Check the connections between the stepper motors and the lead-screws - make sure they are tight.

In the linuxCNC - look into the acel and decel particularly on the "Z" axis.

There is something going on in the machine.

That is not a programming issue. Nothing to do with stepover or anything like that. It also not an issue with your model, It's almost certainly a machine issue.

That machine should be able to handle that job with ease.

Was that a kit built?
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Re: Lines in Finished work

Postby woody53 » Wed Jan 31, 2018 1:49 am

I have a Probotix Meteor and @ over 4 years old haven't had any problems. Call Probotix and talk to Len or Jeremy and tell them the problem and they will give you the fix. They're support is very good.

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Re: Lines in Finished work

Postby Pete Cyr » Wed Jan 31, 2018 3:10 am

If you perform a simulated cut in aspire and it looks good the actual cut should look just like the simulation.....if the actual cut does not look like the simulation (and the actual cut look worse) then there is a problem with your CNC.

Aspire renders a very accurate simulation.
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Re: Lines in Finished work

Postby jarm2 » Wed Jan 31, 2018 9:10 pm

Are you leaving enough allowance between your roughing cut and your finishing cut?
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