I've been trying to cut a hole for 30 minutes and I'm just frustrated and at a loss


#1

Hi,

I don’t know why but the Push/Pull tool will not cut a hole for me, it just creates a cylinder shape that extends from the surface I work on.

I’ve Googled it, read about it and watched videos. It just won’t work for me.
Is there another tool I could use for this?

Thanks.


#2

Pushpull should work for what you are trying to do, so the most likely explanations are either a) a subtle flaw in your model, e.g. the circle is not really on the surface, or b) you aren’t using the tool correctly. If you can upload the model, we can take a look at the former. Since you have watched the tutorial videos, the latter is harder to diagnose unless someone can look over your shoulder.


#3

1260 (according to wife approved design).skp (38.7 KB)


#4

Thought as much. You’ve drawn it on the outside of a grouped object. Either select and explode the wall, or select and Cut the circle…then Paste in Place inside the group. Either way, the hole will then Push/Pull through.


#5

You have drawn the circle in a different ‘entities-context’.
To punch a whole in the grouped wall’s face, you need to either drawn the circle inside a group-edit to cut its face, or edit>cut the circle edges, and then edit the group, then edit>paste-in-place, to add the circle’s face onto that face wall’s.
Either way you can then select that circle’s face - using PushPull to punch the hole as you desire…


#6

I exploded the surface but it didn’t help. It still creates a cylinder.

EDIT: Nevermind, got it! I was only selecting the inside of the circle without the outline. Thanks!


#7

It shouldn’t make any difference that you only select the circular face. You were probably Push-Pulling it beyond the other side of the wall. It won’t automatically stop when it reaches the other side. It’ll just keep going unless you limit the push by lining the cursor up with either the face or an edge on the other side.


#8

Thanks, I’ll remember that tip.


#9

Well here I am using SketchUp once again, feeling just like I felt the first time - I can’t cut a hole. I exploded the object, selected the hole with the outline, and it only pushes the object to the other side instead of making a hole.

Why can’t this program have a “cut a hole” option or whatever, after you outline a shape?

What a PITA. :\


#10

It will do that if you are doing it correctly.

I suppose it would be if you don’t do it right. Share your SKP file so we can see what you’re attempting to do now.


#11

final design - work in progress.zip (16.6 KB)


#12

So this is what I see in your file. Where do you want to cut the hole?

If you aren’t getting a hole, it’s because you aren’t opening the group for editing before drawing the outline and pushing it through. Exactly as TIG described in his post from 11 days ago.

When it is done correctly, it works just fine.


#13

Sorry, here’s the correct file. I want to cut through the rectangle.
final design - work in progress (2).zip (10.6 KB)


#14

Well, since you drew the rectangle so it isn’t on the surface where you want the hole, of course it won’t cut an opening. Put the rectangle on the surface and it works fine.

And just for clarification, you don’t need to explode a group or component to make a modification to it. Exploding for this sort of thing is generally counterproductive.


#15

Well that was easy. I never would have thought to check that it’s actually on the surface. Thank you!


#16

Inner Arch and inner curve.skp (689.1 KB)
I have a similar problem, but a bit more complicated. I have to cut rectangular holes in a arc side going all the way around 180 degrees. The holes have to be 1 per segment and there are 172 segments in the arc. I got the first one with great difficulty, as you can see in the attached .skp file, but the next one seems askew and won’t sit on the face. Is there a way to lock in the correct rotation? Also, since I am ascending up the arc, I have to rotate the rectangular cutout by approximately one degree each time I lay it down so that at the top the rectangle is flipped over 90 degrees.
Eventually, I’ll have to cut a rectangular hole in each of the 172 segments in the underside of the arc component too, and since that’ll be on a curved surface, that’ll be its own special challenge.

Any suggestions?


Need to do cut-outs in arc
#17

Make each arc segment into a component with hole and beams, then Rotate + Copy about the arc centre as many times as you need to complete the arc.

Why do you have 172 segments, not 180?


#18

One reason you are finding it difficult is that the arc isn’t on the red blue plane but off axis. When I tried to rotate your first hole about the green axis, it isn’t in plane. Looks as if some of your tries aren’t working for that reason.

Also, the construction line is near, but not ON the red axis.

I’m guessing from the model that you want the arc you have made to resemble an iron or steelwork lattice with beams - possibly L-shaped, possibly I shaped, and radial joiners. With angled beams too, for stiffness?

Why is the arc such an odd size either in imperial or metric measurements? And I’ll ask again, why not 180 segments?


#19

Something like this? R 200m

Build a one-degree arc segment module from a circle created with 360 sides, then cut half of it off, add another circle inside, then join one end segment across radially between the circles. Delete the rest of the circles.

Cut out some of the face to get the shape you want. Pushpull along Y/green direction to get depth. Add detail as required.

Rotate/copy 179x to get this. Needs a little tidying up at the end.
Arch model.skp (46.7 KB)

Add detail if you need it by making ‘beams’ of L or I shape cross section, and add diagonal bracing as required for stability and stiffness.

You can work on just editing one copy of the arc segment module and all of them will change to match.

PS. If you want to hide the join in the circumferential pieces, just hide the edges at the joining ends of the component.

Or add further joins, if you want to represent how the arch might actually be built and assembled ‘for real’.


#20

I had a reason for 172 segments, but it doesn’t seem like a very good one anymore, and having 180 segments, as you suggest, enables “one degree of separation” so to speak, which makes things easier. I will change the segment count and also redo the arc in the latticework as you suggest, which is a much more satisfactory result. It surrounds a cog elevator/tram, so I have to lay track inside the four corners as well (the elevator pivots on a unique central axis centered on each side as it climbs inside the arc).
The peculiar dimensions down to the fractions of an inch are due to earlier dimension decisions which I am now forced to live with, mostly anyway. This is all part of a much larger structure.