Milling on an inclined profile (3D)

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Milling on an inclined profile (3D)

Postby energysnake » Tue Jul 09, 2019 1:45 pm

Hi,

I need help :wink:

I have to cut a CNC element on these two paths ( please see image and 3D file ).
Can you someone help me generate these paths? Tool is 12mm cutter , the detail is cut out from material 140 x 140 x 40mm.

Thank you in advance for your help.
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swieca-duza..crv3d
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swieca-duza-sciezki.jpg
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Re: Milling on an inclined profile (3D)

Postby Adrian » Tue Jul 09, 2019 3:17 pm

You created that file with the trial version. It can only be opened on the computer you used so no-one here will be able to see it.
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Re: Milling on an inclined profile (3D)

Postby adze_cnc » Tue Jul 09, 2019 4:53 pm

The outside cut is trivial. The spigot cut seems to me a good candidate for the fluting toolpath.
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Re: Milling on an inclined profile (3D)

Postby dealguy11 » Tue Jul 09, 2019 8:12 pm

If you already have components set up for the angled circle, then the path can be cut with profile toolpath with the "project toolpath onto 3d model" option checked, BUT it probably won't be right if you use a flat-bottomed bit because Aspire calculates the toolpath height from the center of the bit, so the "uphill" side will dig into the part. A ballnose bit won't have that problem, but it will leave a radius on both sides of the bit. That's also true with a fluting toolpath.

This could also be done with a carving toolpath and a small ballnose bit. You'd still get a radius on the inside of the included circle, but it could be small with a small enough bit.
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Re: Milling on an inclined profile (3D)

Postby TReischl » Tue Jul 09, 2019 10:33 pm

The way that is drawn would require a machine with more than 3 axis of motion. The closest I could get was with a rotary. It is possible to draw things that are not easily machined or downright impossible. Knowing what the part is going to be used for would be a big help. If it is a cam then there is no reason for it to be planar.

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Re: Milling on an inclined profile (3D)

Postby highpockets » Wed Jul 10, 2019 12:03 am

Something like this?

Image 474.png
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Re: Milling on an inclined profile (3D)

Postby 4DThinker » Wed Jul 10, 2019 1:17 am

The only way I could image creating the part shown is using two pieces. Start with a piece as thick as the lower half, cut the slope using the moulding toolpath or fluting array strategy. Pocket a circular hole in the middle and glue in a previously made cylinder that fits snugly, then cut a slope on the top of that piece using the moulding toolpath or fluting array strategy. Finish by profile cutting out the bottom circle from its surrounding board.

To cut a flat planar slope around the center section is impossible. You could at best get close using a small bit and a 3D toolpath. Followed by some hand work.

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Re: Milling on an inclined profile (3D)

Postby highpockets » Wed Jul 10, 2019 5:12 am

Is the top beveled also or is it just an optical illusion?
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Re: Milling on an inclined profile (3D)

Postby energysnake » Wed Jul 10, 2019 11:34 am

Yes :D highpockets

Please, can you made path based on a model that I just attached to my answer and send such a file to me? Thanks for all help :wink:

https://we.tl/t-5HVCQlXIKQ
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Re: Milling on an inclined profile (3D)

Postby energysnake » Wed Jul 10, 2019 2:01 pm

I do not need to draw this solid in Aspire, I just want to achieve the goal and assign the milling path marked in the attached drawing.

https://imgur.com/a/oXCDAlE
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Re: Milling on an inclined profile (3D)

Postby TReischl » Wed Jul 10, 2019 2:31 pm

energysnake wrote:I do not need to draw this solid in Aspire, I just want to achieve the goal and assign the milling path marked in the attached drawing.

https://imgur.com/a/oXCDAlE


The issues have been explained to you. Since you have the model why don't you assign the tooling path?

As several of us have stated, this part as you have drawn it, will not machine properly on a 3 axis machine. Not sure what you do not understand about that?
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Re: Milling on an inclined profile (3D)

Postby FixitMike » Wed Jul 10, 2019 7:32 pm

Here's how I did it.
1. Select a Flat_Round_Circle from the ClipArt
2. Enlarge it so it is larger than the larger cylinder diameter.
3. In Component Properties, Tilt to the angle of the slope you wish.
4. Draw 2 circular vectors that are the diameters of the 2 cylinders.
5. Make a finish toolpath, selecting the 2 circular vectors for the Machining Limit Boundary. Use a small end mill.
6. Cut out the larger diameter using a profile toolpath.

Note that the sloped surface won't be a perfectly flat surface. There will be a horizontal flat at the lower end that is the width of the diameter of the end mill used.
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Re: Milling on an inclined profile (3D)

Postby FixitMike » Wed Jul 10, 2019 8:24 pm

Corrections to my post:
Item 5: The finish toolpath permits only a ball end tool to be used.
The note should read: "There will be a radius in the inside corner between the small cylinder and the slope equal to the ball end tool radius.
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Re: Milling on an inclined profile (3D)

Postby highpockets » Wed Jul 10, 2019 10:07 pm

Energysnake, Fixitmike has presented an excellent method to achieve what you want.
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