topic Re: Boolean will not cut/subtract in Fusion Design, Validate & Document Forum

Boolean will not cut/subtract

trinitifx — Sun, 12 Sep 2021 19:09:23 GMT

I have modeled a blaster and am on the last part: countersunk holes for the bolt head and acorn nut.

I have boolean joined all parts and have one body. But when I try to boolean cut/subtract the cylinders for the countersunk bolt heads, the boolean does not work. The bolt hole itself cuts clean, but not the larger cylinder for the bolt head countersunk hole. Check the pics. How can I fix this? Thanks

Re: Boolean will not cut/subtract

jhackney1972 — Sun, 12 Sep 2021 19:22:24 GMT

Hard to guess without your model, please attach.

Re: Boolean will not cut/subtract

trinitifx — Sun, 12 Sep 2021 21:11:46 GMT

Hopefully attached and makes sense.

The solution is probably very simple, I am new to F360 (normally use MAX for everything)

Re: Boolean will not cut/subtract

jhackney1972 — Sun, 12 Sep 2021 22:52:15 GMT

Before moving forward, I want to be sure what type of hole you want. You mention, in your first post, countersink holes. I do not think that will work for you as a countersink hole on the curved surface will not hide the screw head. You could counterbore, then countersink but why not use a socket head cap screw and just counterbore. I think you want to use a 4mm screw. I added a view of one hole, if I am off track, let me know as soon as possible.

Re: Boolean will not cut/subtract

trinitifx — Sun, 12 Sep 2021 23:21:26 GMT

Thank you for looking at the file.

I very well may be using the wrong terminology, I apologize.

This fusion 360 model is (hopefully) a much better version of an injection molded blaster we have now.

Here is a picture showing how the bolts fit into their own recessed hole (counterbore?) so they cannot snag or catch clothing or loosen.

Re: Boolean will not cut/subtract

jhackney1972 — Sun, 12 Sep 2021 23:52:59 GMT

You did not verify my question about the size screw so I continued with an M4. As I pointed out, I created three sketches that gave me the centers for the three Hole commands which I point out. The plugs you inserted are not necessary and are hidden in the Browser.

You need to learn some of the basics of Fusion 360, your timeline is a mess. The Move command should be used sparely and you should never have any yellow in your timeline. If you hover over the yellow and right click, it will tell you the error. Model is attached.

Re: Boolean will not cut/subtract

trinitifx — Mon, 13 Sep 2021 01:01:23 GMT

Thank you so much

Sorry, I must have missed where you asked for bolt size. I think these are what is used:

Long bolts are Fastenal #0170345 6-32 x 1-3/4" Phillips Drive Pan

Short bolt is Fastenal #72390 6-32 x 1" Phillips Drive Pan

Acorn nuts are Fastenal #1137703 6-32 Nickel Plated Acorn Nut

I apologize for my timeline.

Re: Boolean will not cut/subtract

TheCADWhisperer — Mon, 13 Sep 2021 13:21:13 GMT

@trinitifx wrote:
I apologize for my timeline.

I recommend that you start over from scratch.

Create Sketch1 and then STOP and Attach it here for inspection.

Step-by-step we can develop robust modeling techniques.

Re: Boolean will not cut/subtract

trinitifx — Tue, 14 Sep 2021 13:21:16 GMT

I printed the shell and it works perfectly!

All tolerances are exact and we are ready to make a mold.

Do I still need to start all over?

Re: Boolean will not cut/subtract

TrippyLighting — Tue, 14 Sep 2021 13:47:46 GMT

@trinitifx wrote:

I printed the shell and it works perfectly!

All tolerances are exact and we are ready to make a mold.

Do I still need to start all over?

That depends. If you want to learn how to use a parametric CAD software such as Fusion 360 properly, then I would strongly suggest you start over from scratch. This model can be completed wit 1/4th of the timeline items!

For example, use simple sketches and extrusions/revolves etc. to create geometry. Stay away from the solid primitives (cylinder, box, torus, etc.). IMHO those are semiparametric legacy tools that should be removed from the software or preferably be replaced by fully functional and fully parametric versions.

It might help to go through one of the tutorial courses here to get a better understanding of how Fusion 360 works.

Re: Boolean will not cut/subtract

trinitifx — Tue, 14 Sep 2021 14:01:53 GMT

Ok, what you are saying makes total sense. I will scrap everything and start all over.

If I understand correctly, there is only one accepted way to properly model in F360, yes?

I have not dealt with that in MAX.

I will start the tutorials you have linked to and try to have a minimal clean timeline with no booleans or solids.

Thanks so much!

Re: Boolean will not cut/subtract

TheCADWhisperer — Tue, 14 Sep 2021 14:30:56 GMT

@trinitifx wrote:
I printed the shell and it works perfectly!
All tolerances are exact and we are ready to make a mold.

If you attached the latest version here - I'll make significant wager that I can point out several issues that YOU would agree are not what you really intended for your design.