Perfect Countersinks

[durahl]

I was kinda wondering if there's a Fusion 360 implemented way to get perfect matching countersunk holes for Flathead Screws so they'll a) sit flush with the surface and b) not intersect with the material or have a gap to it?

[img]https://i.imgur.com/FsK4zaW.png[/img]

[chrisplyler]

The options available in the Hole tool will allow you to exactly control the shape.

Or you can sketch the exact shape you want, with a line down the middle to divide it, and Revolve/cut half the shape out of your stock material.

[chrisplyler]

If you already have the screw, you could align it or joint it flush, and then use it in a Combine/cut/keep tools event to exactly cut the hole around the screw.

[TheCADWhisperer]

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@durahl wrote:

I was kinda wondering if there's a Fusion 360 implemented way to get perfect matching countersunk holes for Flathead Screws.

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This is trivially easy to do in Fusion, but I wonder, how will you make perfect countersunk holes in the real world?

If you can't figure out how to do it in Fusion, Attach your assembly here (only need a fastener and simple plate with hole as best you can get) to demonstrate the techniques suggested by @chrisplyler .

[chrisplyler]

In the real world, we get it as close as possible by installing the screw and then sanding with smaller and smaller grit up through 4000, then grinding the entire face and screw head down at the same time, then lapping it all, then hand scraping, and finally exhaling on it through colored twisty straws until the top layer of atoms in the face and the top layer of atoms in the screw head are coplanar.

[davebYYPCU]

Everyone knows that, but only ever put into practise when under house detention.

[durahl]

Let me rephrase perfect into something like neat to look and touch - Okay?

But given the answers, so far, there appears to be no built-in feature that would allow for holes like that to be created.

I guess the only solution is to create a test block with a bunch of different hole sizes and note the promising ones in a spreadsheet for later use... Kinda unsatisfying ;(

[davebYYPCU]

So Combine Cut, countersink holes and

sketch Revolve don’t work for you,

but are perfectly suitable answers.

[chrisplyler]

The HOLE tool is a built in feature that allows to do it. There are default values that may not work as precisely as you would like for the particular screw that you have. So take some measurements and adjust those values.

[TheCADWhisperer]

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@durahl wrote:

...there appears to be no built-in feature that would allow for holes like that to be created.

My guess is that you have seen some YouTube video of other software.

[etfrench]

I would just use the specifications for flat head screws 😀

[intositeYS9VP]

I use the Hole tool quite a bit. But what if i need the bolt to sit say 0.5mm lower than the surface? How can i do that without having to model the profile in sketch manually? Cause at times i find 3D printing, i need some clearances if not most of the times the bolt won't sit flush/lower. 

[etfrench]

It seems there are different specs for flat head machine screws with slots (or Phillips heads) and flat head machine screws with sockets.  Fusion 360 only uses the slot specs with no option for the socket specs.  I don't think it would be too difficult for the developers to add the socket specs for 82 degree and 100 degree screws.

Here's one way of fitting a flat head machine screw with a socket to a Fusion 360 generated hole, but if you had more than one to do, it would be easier to model your own custom screws.

[intositeYS9VP]

Thanks. That'll be a pain to do when I have 20+ screws. 😓

[TheCADWhisperer]

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@intositeYS9VP wrote:

Thanks. That'll be a pain to do when I have 20+ screws. 😓

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In my experience, it is very very rare with fasteners are not in some sort of pattern.

Do one hole and Pattern.

[etfrench]

Not really:

1. Model the screw with the depth allowance.  This only needs to be done once for any screw type.
2. Import the model into your current file at the top level.
3. Copy it to the component assembly.
4. Joint it to its correct position.
5. Combine/Cut with Keep tools to create the hole.
6. Repeat steps 3-5 or use a pattern.

This process allows you to create an accurate BOM for the model.

[shadaytree]

This is exactly the feature i am looking for. I guess they have not made something like in the video for Fusion 360 in the last year.