Mounting Brackets

[dmadison]

Creates mounting_bracket.scad which generates geometry for 3D-printable mounting brackets. Two brackets are defined, using the same common base geometry:

• mounting_bracket_t_slot for mounting a module to an M4-sized T-slot, using an M4-12 bolt and matching T-nut.
• mounting_bracket_screw_holes for mounting a module to a wooden board using flat-head M4 screws. The hole for the enclosure's bolt either needs to be undersized for thread engagement or enlarged for a heat-set insert (user's choice).

The base geometry uses the existing hole in the bottom enclosure piece and juts up against the left and right enclosure sides to prevent the module from twisting.

This also adds three more functions to shapes.scad: one to create a 3D rounded fillet on a corner, one to create a 3D rounded fillet on an extruded rectangle, and one to create a cone at a specified angle (needed for the 82° countersunk holes).

T-Slot Mount

Screw Mount

For viewing the mounts in position use this snippet in a new file:

include <splitflap.scad>
use <tools/mounting_bracket.scad>

position_mounting_bracket() {
    mounting_bracket_t_slot();
    //mounting_bracket_screw_holes();
}

I've printed both of these mounts for testing and they work great.

[dmadison]

I'm curious - what is the intended way to attach the screw bracket to the module?

There's not really enough space below the module for a captive nut, so I thought the user would either undersize the hole and screw directly into the plastic (easy + free but not strong), or oversize the hole and use a heat-set insert (more difficult + costs money, but very strong).

The latching post idea is clever. I wonder how well it would hold up in PLA since the stressed portion would need to be printed in plane with the layer direction.