Round peg square hole?

pcmoor

Hi
One should group objects before adding others , build the base, right click make group, build the cylinder or another object on top, can group this object too if required. Enter either objects and perform push-pull or any other edits as required.

When happy and if you want objects to attach and act as one, either explode the groups and make one, or make the groups a group or component

gilles

1,2,3...

Is that what you need?

TIG

Or perhaps this ?

mal

The hole is square and the peg is round. That's the problem

pilou

And don't forget that Sketchup can't draw real circles!
It's just a polygon! Maybe with 1000 segments maximum!
So very heavy in polygons as soon as you make some operations with them!

It's different with nurbs program! On the right!

pilou

And you can play with the tricky Lattice maker by Tig!

rothloup

@gilles said:

1,2,3...

Is that what you need?

Gilles,

Almost! I just need the box to be extruded DOWN from the sketch plane, not up.

rothloup

@tig said:

Or perhaps this ?

TIG,

Almost, just like gilles! In any case, you have both taught me about the value of fixing up the drawing before I push/pull.

TIG, if I were able to take the form at the end of the sequence you showed, and then move the walls of the cylinder UP so that bottom of the cylinder is coplanar with the top of the square, then I would have the shape that I need.

I'll play with the method you demonstrated to see if maybe I can modify to do what I need.

However, this does seem to bring to light an annoyance of SU that I hope there is a workaround for. Your solution makes sense if one starts knowing the exact shape one is trying to draw - but in my case, I didn't decide to add the "basement" (the square portion) until after I had already put considerable drawing effort into the first floor (yes, I'm designing a house). When I drew the square, its lines intersected with the bottom of the cylinder. If I delete those lines as you suggest, then the cylinder starts losing walls.

I've tried many means of trying to "turn off" the interaction between the circle and the lines (hiding them, putting them on different layers, etc) but SU seems to insist that the border of the circle must be a boundary when I try to extrude the square. Any suggestions?

Thanks
-Ron

Box

You need to work with groups and components to separate your geometry.
Make the square a component and the circle another component and you can extrude them in opposite directions without interacting with each other.

pbacot

@rothloup said:

@tig said:

Or perhaps this ?

I've tried many means of trying to "turn off" the interaction between the circle and the lines (hiding them, putting them on different layers, etc) but SU seems to insist that the border of the circle must be a boundary when I try to extrude the square. Any suggestions?

Thanks
-Ron

Ron,

I am sure TIG will be able to help you out, but let me say that these are not workable techniques. In SU the geometry is connected whether you hide it or put it on other layers (both risky procedures). Use Components or groups to keep geometry separate. Do not put any raw (un-grouped) geometry on any layer besides Layer0. A good way to separate and hide geometry is to make it into a component or group and place THAT on a new layer. The component/ group makes it separate (not affecting other geomentry), the layer makes it possible to hide it. "Hide / Unhide" is a good command for temporary and limited use, but the geometry is still able to interact with adjacent geometry in the same context.

Peter

TIG

Hiding geometry that is connected to other geometry does not 'separate' it - so it moves/deletes as one thing.
Using different on/off layers for part of some connected geometry also 'hides' it, BUT again it's still connected.
It's a recipe for madness.
Make a rectangular face.
Select the face and assign it to an 'off' layer.
Now erase one of the visible edges.
Now switch the 'face-layer' on - the face has vanished as it depended on the edge that you just erased !

Always model raw geometry on Layer0 - have it as your active layer..
To separate parts of geometry use a group [or make a component of it].
You can then hide/layer that 'container' separately from the rest - it is no longer 'connected'...
Geometry that sticks together is very useful, but when you don't what that effect put the geometry inside 'container' groups or components...