Problem in performing countersink

[Anonymous]

 I'm unable to make countersink hole with specs. as folllows

[paul.clauss]

Hi @Anonymous

Thanks for posting! It looks like you are experiencing some problems while creating a countersunk hole in Fusion 360.

Are you receiving the error shown below when attempting to create this feature?

If so, it is because the countersink diameter is the same as the diameter of the M6 tapped hole, which means that there is really no countersink. Do you know what the bolt head diameter is for this feature is? Entering that diameter as the countersink diameter (which refers to the top, outer edge of the countersink) should allow you to create this feature - the 6mm countersink diameter would not remove any material from the top of the tapped hole, as the outer diameter of the countersink is the same as the diameter of the thru hole. In this way, the countersink diameter must be greater than the thru hole diameter for Fusion to create a countersink.

For your hole, I believe you will want to set the diameter to 6mm (for the M6 tapped hole), the depth to 10mm, and both the tip angle and countersink angle to 90 degrees after setting the countersink diameter to the diameter of the bolt head/the desired major diameter of the countersink (larger than the thru diameter).

I am unsure of what standards you use in your drawings, so please let me know if I have misunderstood the question and we will continue troubleshooting - I am happy to help!

[Phil.E]

Thanks Paul. I have a slightly different method.

The tap diameter of a 6mm hole is 5mm. 

1. First create the 5mm hole with the 6mm countersink.
2. Next add the 6mm thread to the hole.

Let me know if you have questions.

Regards,

[Anonymous]

How can we derive tap diameter from info. M6x1 ? I'm a beginner and less acquainted with such specifications.

[Phil.E · Accepted solution]

I used google. I see where you are coming from however. In mechanical design it's common knowledge that the drill is smaller than the nominal thread size. I don't know how to relay this to non-mechanical designers from within Fusion itself.

The good news is Fusion 360 development is looking for ways to combine Hole and Thread so you can build the hole without special knowledge, at least I hope it works that way when they finish it. I have no idea about when they will be done.