Use “Extend Start” to create Recess Countersunk Holes!

Require a Recessed Countersunk Hole?

The Hole Tool in Inventor 2018 has received a new option, that new option is the “Extend Start” tool.

Inventor 2018 Hole Tool now includes Extend Start
The Hole Tool Dialogue Box with the new option now in Inventor 2018

 

If you have created holes that are not perpendicular to the start plane, you will have noticed a fragment of material left behind in the hole.

See an example of this below;

Inventor 2018 Hole Tool now includes Extend Start
Typically, Holes created that are not perpendicular to the start plane can result in a fragment of material left behind.

Here’s a section view of the Hole showing the fragment.

Inventor 2018 Hole Tool now includes Extend Start
The fragment exists at the start of the hole feature.

Use the Extend Start option to remove the fragment.

Inventor 2018 Hole Tool now includes Extend Start
When the Extend Start option is switched ON, the fragment is removed.

Use the ‘Extend Start’ option to create Recessed Countersunk Holes.

This is made possible using the Extend Start option.

Make sure you start the hole feature based on either a sketch or work points that are offset from the material surface.

My example shows that I created a work surface inset 2mm from the top of the material to host the sketched hole center points. The hole tool identified the points and using the countersink option I created the hole as below. This hole has the Extend Start switched OFF.

Inventor 2018 Hole Tool now includes Extend Start
This will not do at all!

Switch Extend Start ON to realise the required hole; Recessed with a Countersink.

Inventor 2018 Hole Tool now includes Extend Start
The Recessed Countersunk Hole

 

Inventor 2018 Hole Tool now includes Extend Start
Here’s the result in the context of an assembly

You can read more about the new option in Inventor Help Files;

Hole Creation Enhancement

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