Installing heat-set inserts for 3D printed drawer pull knobs
I designed 3D printed drawer pull knobs for the clockmaker's bench that I'm creating. Like many knobs, each of these knobs will screw onto a bolt that goes through the front of a drawer. To make the knobs hold well, I decided to press a threaded, heat-set insert into the back of each knob instead of using relatively weak, 3D printed threads.
In this video I show how to press a heat-set insert into a 3D printed part, using a soldering iron.
A nice Hackaday article on desiging for and installing heat-set inserts: https://hackaday.com/2019/02/28/threa...
The installation tip(s) for my soldering iron. Not exactly for a 1/4 inch insert, but it works for me: https://smile.amazon.com/gp/product/B...
The drawer pull knob design is open-sourced on Cults3D: https://cults3d.com/en/3d-model/home/...
The Heat-Set Inserts for plastic, for a bolt with 1/4-20 threads: https://www.mcmaster.com/94459a370
The matching 1 3/4 inch bolts to fit my bench drawers: https://www.mcmaster.com/91772a548
The "Fixture" I keep referring to in the video is simple: it's a stand-in for the front of the drawer I'm going to screw the knob into: it's a piece of wood - in this case 1 and 1/2 inch thick, with a 1/4 inch hole drilled straight into it. Just 1/4 inch of the bolt protrudes from the wood so that I can screw the knob flat into the face of the wood. As I explain in the video, this simple fixture makes the heat-set insert nicely perpendicular to the face of the knob. The fixture looks more complex just because it's a piece of scrap wood that has other holes in in.
The parts are SAE rather than Metric because 1/4 inch is a very common bolt diameter where I live.
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