Help with 3D tear out

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MDHunt
Posts: 21
Joined: Thu Jan 19, 2017 5:15 pm
Model of CNC Machine: Shark HD4

Help with 3D tear out

Post by MDHunt »

I did a test run of a 3D roughing toolpath (.25BN), followed by a 3D finish (.125BN) and got tearout in some of the wood. I am carving into a 16"x36"x.75" pine panel. I am running Aspire 10.5 on a Shark HD4. The spindle is running at 15,000 rpm with a feed rate of 60 ipm, pass depth of .125 and stepover of .05.
I realize that it could just be the use of pine, but if there is something I am missing besides that, I would appreciate the help. In the pic, only the left side of it had the finishing toolpath run. It was just a test run, so I didn't complete it.
Pine tear out.jpg

SteveNelson46
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Re: Help with 3D tear out

Post by SteveNelson46 »

Did you design the shape yourself or was it created from an image?
Steve

ohiolyons
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Re: Help with 3D tear out

Post by ohiolyons »

Kid of a rule of thumb (pirate rule) not to exceed 1/2 of diameter on pass depth.

And you are right, pine is not helping.

I do all my mockup/prototypes in pink building foam. Tear out never an issue and it machines like wood.
John
CNC in Kettering, Ohio

ohiolyons
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Re: Help with 3D tear out

Post by ohiolyons »

Just saw the little gouges which do not appear to be tear out.

It looking like a machine issue.

Draw a vector around the medallion and cut that area again on another piece of wood to see if the gouge happens again.
John
CNC in Kettering, Ohio

MDHunt
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Re: Help with 3D tear out

Post by MDHunt »

SteveNelson46 wrote:
Sun Oct 18, 2020 7:20 pm
Did you design the shape yourself or was it created from an image?
Steve, the shape was created from an image. I googled Army Aviation Wings svg and found the picture.

MDHunt
Posts: 21
Joined: Thu Jan 19, 2017 5:15 pm
Model of CNC Machine: Shark HD4

Re: Help with 3D tear out

Post by MDHunt »

ohiolyons wrote:
Sun Oct 18, 2020 7:37 pm
Kid of a rule of thumb (pirate rule) not to exceed 1/2 of diameter on pass depth.

And you are right, pine is not helping.

I do all my mockup/prototypes in pink building foam. Tear out never an issue and it machines like wood.
I will check the pass depth and check for stray vectors in that area again. Very interesting about the pink foam, I'll have to give that a shot.
Thanks

ohiolyons
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Re: Help with 3D tear out

Post by ohiolyons »

one warning on pink foam!

DUST COLLECTION

Unless you want a thin pink coating on everything!!!
John
CNC in Kettering, Ohio

SteveNelson46
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Re: Help with 3D tear out

Post by SteveNelson46 »

MDHunt wrote:
Tue Oct 20, 2020 2:57 am
SteveNelson46 wrote:
Sun Oct 18, 2020 7:20 pm
Did you design the shape yourself or was it created from an image?
Steve, the shape was created from an image. I googled Army Aviation Wings svg and found the picture.
Photos downloaded from the internet are almost always low resolution (76 dpi) and usually have extraneous and stray pixels that will leave rough edges, dimples and rough surfaces when carved. To convert photos to anything acceptable for machine carving you will need a high resolution photo with at least 600 dpi or greater. Even then, most will require some cleanup. I think this is your problem. It can be cleaned up but, it will take some time in a good photo editing software like Photoshop or Corel Photo Paint.
Steve

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adze_cnc
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Re: Help with 3D tear out

Post by adze_cnc »

Images (JPG, PNG, BMP, GIF) don't really have a "DPI". It may be specified within them but that only tells software that will print them how large to print them.

It's the same as saying a circle is 2.54cm, 1in, or 25.4mm. The circle is the size it is only our interpretation changes.

A 1080x810 image is simultaneously 72dpi, 600dpi, or 134.4434234dpi. You want an image with a high x and y pixel count: compare http://clipart-library.com/image_gallery/n1283511.png vs https://donyayema.info/wp-content/uploa ... onaut-.jpg.

How did you convert the image to a 3D model to cut?

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