Round parts and features… Part 1

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Features, and Holes on cylindrical parts, or How do I draw on Round things…? PART 1

As we all know, round parts have a slight sketching challenge; there are no planes to pick from the cylindrical surface. This can be a problem if one is not aware of the tools provided; a combination of construction planes and axes to allow feature definition on the cylindrical surfaces. These include angle offset, offset from the center axis, and various other positional locations on a cylindrical part.

Let us take a look at some solutions and tools to help with these tasks. Note the figure below represents a part that could become a problem child:

A working knowledge of Planes and Axis tools will be needed to define any of the holes and features in the part above.

TIP:  turn on your default work planes…

Starting with the raw part below:

 

Let’s add a feature to the part like the particular one identified below…

Adding the hole feature is very easy and straight forward, and we will use the point & line technique to define a sketch plane on the cylinder surface.

Steps:

1. Drop a plane along the part Axis at desired location…

2. Create a new sketch on the plane created in step (1)

3. Create the vertical and angled line as shown above, and then dimension to the desired angle as show in figure below. This will provide us with the ability to rotate the position of our feature around the part cylinder and along the length of the cylinder – two positioning controls!

4. After finishing the sketch from steps 1, 2 & 3, use the line created in the sketch to create a plane on the end point of that line and normal to that line. The figure below shows the expected results…

5. Now we need to select the plane just created as our new sketch plane, add the geometry to define the hole (feature) shape, see the figure below…

TIP: if this is a counterbored hole, define both the counter bore dia., and the hole dia. in this sketch and share it later for the hole creation.

Hope you found this process helpful. The following PARTS of this TIP sheet will cover the creation of the remaining features each using a different process…

Stay Tuned

Mike

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