Cannot create cylinder at plane / point intersection

[Anonymous]

This should be the simpliest thing ever , and i cannot even do it...

I just need to create a cylinder with the center starting at the intersection of a plane / axis ( i created a point )

I dont't know why i cannot select this point to use as a center , an idea anyone ?

[g-andresen]

Hi,

an extrusion can only be created from a plane and not from a point.

günther

[MoshiurRashid]

Hi

Thanks for posting. Well, it is an issue that applies for everyone. You can't "snap" the center of the circle like in the sketch platform! I actually don't think it is a good way to use Cylinder command in the middle of the design. For primary shape it is ok but, for you, I think you should create a Circle by yourself and then Extrude it simply. 🙂

That gives you more control rather than Cylinder command.

[chrisplyler]

That's right. Personally, recommend STRONGLY to NEVER use the Create>Box, Create>Cylinder, Create>Sphere or Create>Torus primitive commands. The Pipe and Coil have their uses, but those first four are complete crap.

[Anonymous]

Hi , 

Thank you, but i also tried in the sketch tool , and i also cant snap the center ..

I just need to create a cylinder a bit longer who fit in the hole under ....

[MoshiurRashid]

Click on "create sketch", select the plane. press "p" select the point. click ok.

Now you can snap it I think.

[chrisplyler]

Use the Project tool to capture the hole in the new sketch. It will get a center point with it as well. Then you can sketch the smaller circle you want, or even just offset the projected one by a small negative amount such that the cylinder you will be extruding will fit into the hole with a bit of clearance.

[TheCADWhisperer]

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@Anonymous wrote:

This should be the simplest thing ever, and i cannot even do it...

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File>Export and then Attach your *.f3d file here and someone will demonstrate a simple technique (or two).

[davebYYPCU]

Where did the hole in the bar come from?

Sketch or primitive?

Extrude two directions, from the face of the bar.

Might help....

[Phil.E]

Hi,

You said a few replies back:

"Hi , 

Thank you, but i also tried in the sketch tool , and i also cant snap the center ..

I just need to create a cylinder a bit longer who fit in the hole under ...."

It sounds like you tried a sketch. When you are in that sketch, use the Project Geometry command. Select the axis and/or point. This workflow is what allows you to make a connection between previously created geometry/features and current sketches.

You'll see a dot appear that represents the intersection of the axis and your sketch plane. Use that to sketch a circle.

If those previously created features are edited and change shape, the sketch you want to make will update to keep everything in line as you are intending.

[fusiondesigner]

There doesn't seem to be any reason why this feature isn't supported. There is a plane on which the cylinder is being created, and a reference point on that plane at which to place the center. So why doesn't the center placement snap to that point? Creating a sketch for every such operation is not a sustainable workaround, this needs to be fixed.

[TheCADWhisperer]

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@fusiondesigner wrote:

Creating a sketch for every such operation is not a sustainable workaround, this needs to be fixed.

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I recommend using sketches rather than placed primitives.

[davebYYPCU]

21st century logic, (am I too old?)

Make a box,

make an Offset Plane

make an Offset Plane

make a work point,  that is not compatible with a cylinder start point.

To avoid sketching / extruding a circle,

in a sketched based parametric modelling program.

[fusiondesigner]

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@davebYYPCU wrote:

"make a work point,  that is not compatible with a cylinder start point

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Why is a work point created as an intersection on a plane not compatible with a cylinder start point, for a cylinder starting on that plane?

[fusiondesigner]

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@TheCADWhisperer wrote:

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I recommend using sketches rather than placed primitives.

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I agree it can be done with a sketch, but that is not really an answer to the question as to why it doesn't work with placed primitives. When models, components, assemblies have to maintained, modified over several years with hundreds of branches, with components ranging from a few millimeters to several meters across all in the same model, "create a sketch" for every little thing doesn't really work.

Either you have direct 3d modeling, or you don't. A fresh installation of Fusion 360 starts in the Design workspace with direct solid modeling, not sketching. 

I made the video above to illustrate only one case of the problem. For example, the corner of a box works as the start point for a cylinder. So why doesn't it work with any other marked point on one surface of the box? This is a shortcoming and should be addressed.

[davebYYPCU]

Because the work point does not carry the properties of a plane. 

Construction (Work) geometry (graphics articles), have no actual geometry to snap to. 

Cylinder is just a macro for extrude circle, looking for a sketch point, and will align to that point's sketch plane in the process.

Sketches and or Parameters hold the file geometry details. 

(I can but don't use DM.)

Might help....

[chrisplyler]

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@fusiondesigner wrote:

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I agree it can be done with a sketch, but that is not really an answer to the question as to why it doesn't work with placed primitives. When models, components, assemblies have to maintained, modified over several years with hundreds of branches, with components ranging from a few millimeters to several meters across all in the same model, "create a sketch" for every little thing doesn't really work.

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LOL that's EXACTLY how it really works.

Did you read my prior post in this thread? The primitives are crap. If you use one, you're shooting yourself in the foot.

[TheCADWhisperer]

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@fusiondesigner wrote:

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..."create a sketch" for every little thing doesn't really work.

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Attach an example of your typical work here.

Preferably 3D geometry file(s), but 2D, or photo if not 3D.

[fusiondesigner]

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@chrisplyler wrote:

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LOL that's EXACTLY how it really works.

Did you read my prior post in this thread? The primitives are crap. If you use one, you're shooting yourself in the foot.

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I encourage you to give the primitives a try. I suspect you have been impeding yourself for years by not using them to their full potential and by staying stuck in "draw in 2D and extrude" mode.

[laughingcreek]

@chrisplyler is 100% right about the primitives.  they are crap.  We use fusion primarily for the parametric abilities.  the primitives completely lack the capabilities needed to make strong robust parametric models.

honestly, you you really just want to use primitives, there are other programs that are better suited to that work flow.  tinker cad comes to mind.

but then you would be limiting your ability to create mechanical models with any serious level of complexity.