How to make screw mounts on a box..

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Ank
Posts: 13
Joined: Thu Sep 19, 2019 5:22 pm

How to make screw mounts on a box..

Postby Ank » Fri Sep 20, 2019 2:46 pm

How can/should I make those red things ? (mounts with hole)
- I am not asking about the hole part, but how to make that tapered profile ?
The top does not need to be rectangular, circular or a line would work too, as long it allows a screw..
Screenshot from 2019-09-20 16-41-31.png
Screenshot from 2019-09-20 16-41-31.png (27.57 KiB) Viewed 191 times
openBrain
Posts: 1959
Joined: Fri Nov 09, 2018 5:38 pm

Re: How to make screw mounts on a box..

Postby openBrain » Fri Sep 20, 2019 2:55 pm

Could you please attach your FreeCAD file? Optimal method will greatly depend on how you modeled your current part?
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papyblaise
Posts: 544
Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: How to make screw mounts on a box..

Postby papyblaise » Fri Sep 20, 2019 3:27 pm

Hello
on a internal face of the box draw a new sketch with the profil of the angle , rotate it aroud his vertical edge 90°only , and 2mirror and polar array
Attachments
box.PNG
box.PNG (10.64 KiB) Viewed 180 times
box.FCStd
(65.8 KiB) Downloaded 5 times
chrisb
Posts: 18098
Joined: Tue Mar 17, 2015 9:14 am

Re: How to make screw mounts on a box..

Postby chrisb » Fri Sep 20, 2019 3:50 pm

In PartDesign I would use a triangle and pad it - and leave it like that. If you really want it to be conic in two dimensions, add another triangle for a pocket.
Ank
Posts: 13
Joined: Thu Sep 19, 2019 5:22 pm

Re: How to make screw mounts on a box..

Postby Ank » Fri Sep 20, 2019 3:59 pm

The file is here:
https://drive.google.com/open?id=1wdNiM ... 4HJ56TiVDE

I would like to avoid steep overhang so that it is very easy to 3D print.
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Willem
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Location: Lisse, The Netherlands

Re: How to make screw mounts on a box..

Postby Willem » Fri Sep 20, 2019 4:13 pm

Checking your design with the dependency graph I see red lines, that means these are illegal operations. Rework the model so all operations are valid
Schermafdruk van 2019-09-20 18-09-01.png
Schermafdruk van 2019-09-20 18-09-01.png (263.58 KiB) Viewed 163 times
Ank
Posts: 13
Joined: Thu Sep 19, 2019 5:22 pm

Re: How to make screw mounts on a box..

Postby Ank » Fri Sep 20, 2019 4:19 pm

and @papyblaise - thanks for a great example.
Ank
Posts: 13
Joined: Thu Sep 19, 2019 5:22 pm

Re: How to make screw mounts on a box..

Postby Ank » Fri Sep 20, 2019 4:23 pm

Willem wrote:
Fri Sep 20, 2019 4:13 pm
Checking your design with the dependency graph I see red lines, that means these are illegal operations. Rework the model so all operations are validSchermafdruk van 2019-09-20 18-09-01.png
Will try to figure out what exactly is wrong.
what throws me off completely is the crazy thing with having a sketch with a useful name, then doung something with it, and suddenly Freecad copies that reasonably named sketch to CopySketch006 or other mess like that...
I would almost believe I needed to do something very wrong to make it do that.
chrisb
Posts: 18098
Joined: Tue Mar 17, 2015 9:14 am

Re: How to make screw mounts on a box..

Postby chrisb » Fri Sep 20, 2019 5:43 pm

For such a box you should stay in PartDesign workbench - as papyblaise did.
kisolre
Posts: 1359
Joined: Wed Nov 21, 2018 1:13 pm

Re: How to make screw mounts on a box..

Postby kisolre » Fri Sep 20, 2019 7:47 pm

Symmetry for the base sketch for easy placement of later features. Sketches drag/dropped over the body name to place them inside the body. Mapped to base planes for propper attachment. Sketches fully constrained with meaningfull constraints - could be measured in real world. Screw holes connected to supports with CarbonCopy. Side sketches modified for printability. Supports for top bolts as per papyblaise suggestion, sketch moved to proper position by changing its attachment properties. Removed arduino board and lcd display to reduce file size.
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BatteryTester_kiss.JPG
BatteryTester_kiss.JPG (63.87 KiB) Viewed 118 times
Attachments
BatteryTester_kiss.FCStd
(176.31 KiB) Downloaded 7 times