how to extrude from curved surface

[ZeeProMaker]

Hi,

I am struggling to accomplish the extrusion of a cylinder from a cylindrical surface, add some feature to the cylinder (see upper left corner) and afterwards make those into a revolved circular pattern along the curved surface.

When I try to draw the circle and project it onto the curved surface, the resulting circle cannot be extruded or pushed/pulled and I guess its not a real circular cylinder anymore.

When I use split surface, the result cannot be extruded but it can be pushed/pulled but gains in size as its extruded outwards and the origin shape is not a real circle anymore.

Furthermore I would like to have a resulting cylinder revolved as a circular pattern along the curved surface. But neither projection nor split surface allowes the result to use circular pattern.

I tested with "plane at angle" but it would have to be a new plane for every cylinder. It seems overly complicated that way plus I was unable to align the cylinders correctly.

Hopefully you can help me with a solution.

Thanks for you help

[Beyondforce · Accepted solution]

Hi @ZeeProMaker,

I hope this helps:

Cheers / Ben
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[jeff_strater · Accepted solution]

@Beyondforce's suggestion works well.  There are other options.  Here's another one, using a tangent workplane, and a two-way extrude.  It's fine if the extrude extends into your body, because that will just get absorbed into the main body:

Jeff

[ZeeProMaker]

Thank you both for the quick replies and great solutions.

Using the first method i get the desired result, but the cylinder still grows in size. Its small so that I can live with it, but maybe I missed something or there is another trick to counter the size-growing.

Using the second method I was unable to align it correctly, so that the angle of the cylinders is wrong.

I experimented with different angles of the angled plane and with one specific angle it finally aligned correctly.

The picture shows what I mean with mis-angled.