Hi,
I can't get joint origins to snap to centre of holes any more, and it's winding me up lol.. I used to be able to hover over and it would snap to the centre of the hole, but now it puts the snap point out from the hole, for seemingly no good reason... What on earth is the problem with it please?..
Can't get joint origins to snap to center of hole anymore...
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John Hackney, Retired
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3 things here that would give grief,
Faces and not Feature,
The hole command goes right through, so 8 times pattern will put two hole sets in the same place.
Suppress is disabled now, but there is only 2 rows of holes.
Works with hole Command - changed depth to 15.00
Feature select Hole in Timeline, 8 and full angle, Adjust, Suppress or adjust the angle / count.
Might help....
Hi,
I opened that last file and looked at the hole command and changed extent to distance, and it says 29.999cm. That should be 30cm. I dunno why it's taking off 0.001cm... Maybe that is flagging part of the problem...
I've changed to using a circle extruded rather than made with the hole command. Changed to using features, and a -45 degree copy with the circular pattern. It's still being weird... The original cut is fine, but the copy refuses to let me snap to the middle of the hole.
@SavedByTheLamb - A couple of things:
- you cannot snap to the center of the "circle" here, because it is not a circle - a circular hole through a cylinder produces a complex curve:
- you can select the cylinder and snap to the endpoints of the virtual cylinder.
- if needed, hold down CTRL (CMD on Mac) to "lock in" that cylinder, so you can pick any of the 3 snap points
- note, though, that the JO is at the end of the "virtual cylinder", and will not lie in line with the face:
so you will have to adjust the point so that it is closer to being in line with the faces
I did not have any trouble at all adding a JO to any of the cylinders here, original or patterned
In theory, the type of pattern (face vs feature) should not matter at all here. In general, if you are patterning geometry, use Face or Feature/Optimized for efficiency. Feature/Adjust can be very slow to compute, and should be avoided.
Jeff Strater
Engineering Director
"This is going well over my head. They are all circles so far as I can tell. It's not a circular hole through a cylinder. It's a circular/cylindrical hole through a load of rings..."
I've forgotten the math here, but the intersection of two cylinders (your "rings" and "holes" are both cylinders) is not a circle. It is, for lack of the proper mathematical definition, a "potato chip" curve. Joint Origins can only snap to the center of a true planar circle.
"Why is the "virtual cylinder" longer than the actual hole?.."
I'm not sure how the extents of the cylinder are computed, but it is guaranteed to include all of the geometry of the trimmed cylinder.
"Do you mean you could get a joint origin flush to the face, on any of them?.. I can get a origin point on any, but the copied ones will not go flush."
I do not see any difference in behavior of the original or the patterned versions. No, you cannot get a flush JO on any of them. The larger the cylinder, the closer it will be, but none should truly be flush.
Jeff Strater
Engineering Director
"No, you cannot get a flush JO on any of them. The larger the cylinder, the closer it will be, but none should truly be flush."
It may not be perfectly flush on the original hole but it looks like it is. It's probably as close as possible. Whereas the copy is way off... And both holes are identical in shape, so something else is causing the original to snap flush, and the copy to refuse to do so.
That picture is a merge of 2 separate screenshots while hovering the cursor over the hole, that is how both joint origins are able to be seen at the same time...
ah, OK, that helps a lot, and actually describes the problem pretty well, so thanks. It all has to do with that virtual cylinder I described earlier. It seems the virtual cylinder is much tighter on the original than on the pattern instances. This is something we can look into, definitely.
Jeff Strater
Engineering Director
