Slanted Holes Inside a Part

CAD/CAM/CNC
1

Good morning,
I have a part that I am programming in cam on Inventor. How are these holes slanted? Is this done using 5 axis maybe? any help will be appreciated.Capture

2

I think I know how its done. I believe they fixtured this part at an angle. I can find the angle by measuring the hole against the plane. Then set that angle measurement into a fixture using angled parallels or a sine plate. Am I correct?

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3

If you don’t have a 5-axis you are on the right track with the other options. Some of those holes look tapered :man_facepalming:

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4

It would appear to be possible using a 4-axis (on a trunnion in a VMC) if the drill diameters will clear the counterbores. Both appear to be tapered drills, maybe even a custom drill for the smaller hole. Or you can fixture and drill the holes in a 2nd op

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5

I assume this is a cross section?

6

Yes. This is the cross-section of the part.

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7

Looks like you could tip at an angle and possibly use a lollipop Style cuter to do some of it besides that looks beyond my thinking that it is even possible. I hope it turns out well for you keep us posted.

8

Thank you! I sure will. That’s the easy part. You should see the one I have to do next. They don’t make a tool for it. They had to get a tool make to make one for the hole. I will post a picture of it.

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9

Here is the pic of the hole with the funky geometry.

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10

Are they perpendicular to the intersecting holes?
If they aren’t tapered holes, is it a compound angle? The taper angle on the left hole looks really close to hitting the first/second bore corner. The one on the right looks like it’s a compound angle.
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11

If you don’t have 5 axis you may need to do some math and use a sine bar to point the headstock of your conventional milling machine, but before doing it, draft locations on your part, then turn your headstock and for pointing you can get a laser locator or just sharpen a long bar for this job. In order to get location, you can use your cad software. Remember before to starr drilling you may need to create a flat surface with a cutter an then a center drill.