I'm getting another unexpected result
I'm trying to cut a shape made from a two rail sweep inside a block, with exact dimensions. When I do a roughing cut, the internal diameter is much larger than expected. The shape in supposed to be 2.25" across, but after I cut it with a 12 mm end mill, it is about 2.75". Is there a way to constrain the roughing tool within the boundaries?
shape cutting misadventure
- ohiolyons
- Vectric Wizard
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- Model of CNC Machine: Laguna IQ
- Location: Kettering, Ohio
Re: shape cutting misadventure
Boundary Offset normally covers that.
Check your bit info. It happens several times a month where the bit is miss named/sized and the hole is cut differently than expected.
Helps if you post the file, less guessing.
Check your bit info. It happens several times a month where the bit is miss named/sized and the hole is cut differently than expected.
Helps if you post the file, less guessing.
John Lyons
CNC in Kettering, Ohio
CNC in Kettering, Ohio
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- Vectric Apprentice
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- Model of CNC Machine: PDJ pilot pro
- Location: Calgary Alberta
Re: shape cutting misadventure
I'll try to post file here.
I checked the tools as well. All tools seem correct.
I checked the tools as well. All tools seem correct.
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- plane wood 2 test coffin style.crv3d
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- Vectric Apprentice
- Posts: 68
- Joined: Sat Sep 17, 2016 1:56 am
- Model of CNC Machine: PDJ pilot pro
- Location: Calgary Alberta
Re: shape cutting misadventure
the preview shows the thin walls too. So it is actually cutting the way it is showing on the preview.
And, what you tell the CNC to do not always what you want it to do.
And, what you tell the CNC to do not always what you want it to do.
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- Vectric Apprentice
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- Joined: Sat Sep 17, 2016 1:56 am
- Model of CNC Machine: PDJ pilot pro
- Location: Calgary Alberta
Re: shape cutting misadventure
my boundry offset was set at 0.0"
- ohiolyons
- Vectric Wizard
- Posts: 1714
- Joined: Wed May 27, 2009 7:16 pm
- Model of CNC Machine: Laguna IQ
- Location: Kettering, Ohio
Re: shape cutting misadventure
So Roughing and Finishing Toolpaths are calculated from the center of the bit, you are using a 1/4" bit, that would account for .25 of your issue. 1/8" on each side. If I remember correctly, someone will surely correct me.
I'm still thinking on this one.
EDIT:
If you include the rest of the block as part of the model with the area you are trying to cut it should solve your problem.
I'm still thinking on this one.
EDIT:
If you include the rest of the block as part of the model with the area you are trying to cut it should solve your problem.
John Lyons
CNC in Kettering, Ohio
CNC in Kettering, Ohio
- ohiolyons
- Vectric Wizard
- Posts: 1714
- Joined: Wed May 27, 2009 7:16 pm
- Model of CNC Machine: Laguna IQ
- Location: Kettering, Ohio
Re: shape cutting misadventure
Your present project only has 3d components for your "hole".
You maybe able to pull it off with a zero plane and then select the rectangular vector to limit the cut.
You maybe able to pull it off with a zero plane and then select the rectangular vector to limit the cut.
John Lyons
CNC in Kettering, Ohio
CNC in Kettering, Ohio
- ohiolyons
- Vectric Wizard
- Posts: 1714
- Joined: Wed May 27, 2009 7:16 pm
- Model of CNC Machine: Laguna IQ
- Location: Kettering, Ohio
Re: shape cutting misadventure
I tried zero lane it didn't seem to help.
John Lyons
CNC in Kettering, Ohio
CNC in Kettering, Ohio
-
- Vectric Apprentice
- Posts: 68
- Joined: Sat Sep 17, 2016 1:56 am
- Model of CNC Machine: PDJ pilot pro
- Location: Calgary Alberta
Re: shape cutting misadventure
I recalculated the opening minus half the diameter of the tool, both for roughing and then for finish toolpaths. Preview looks much better.