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CNC / Re: 3D Print Thread Inserter
« Last post by ddmckee54 on December 11, 2025, 06:28:07 PM »Andrew:
If you haven't already discovered it, when you're putting an insert into a blind hole you need to make the hole a couple mm deeper than the insert. The hot insert will push molten plastic ahead of it as it is inserted and if you don't leave a place for that to go, it WILL fill the insert's threads - DAMHIK.
If you're setting the inserts by hand, a trick I picked up from Clough42 is to take the heat away while the insert is still a little proud of the surface. Then quickly flip the part over and press it down on a flat surface. The insert will retain heat for a while and pressing it on a flat surface does 2 things, it sets the insert flush with the surface and it also wicks some of the heat out of the insert.
When I was installing the inserts for the track drive motor plates into the frame for my Terramac RT7R I discovered that the idiot who put the 6 heat-set inserts between the frame rails never considered how it would be possible to fit over 150mm of soldering iron into an 80mm gap. What I finally did was to set the insert into the hole, I used the soldering iron to get the insert hot - but not try to seat it in the hole, then I used a piece of flat bar to seat the insert flush with the surface. The flat bar I used was a 6" piece of 1//4" x 3/4" HRS, I set the 6 inserts in less than 5 minutes and it barely got warm.
Don
If you haven't already discovered it, when you're putting an insert into a blind hole you need to make the hole a couple mm deeper than the insert. The hot insert will push molten plastic ahead of it as it is inserted and if you don't leave a place for that to go, it WILL fill the insert's threads - DAMHIK.
If you're setting the inserts by hand, a trick I picked up from Clough42 is to take the heat away while the insert is still a little proud of the surface. Then quickly flip the part over and press it down on a flat surface. The insert will retain heat for a while and pressing it on a flat surface does 2 things, it sets the insert flush with the surface and it also wicks some of the heat out of the insert.
When I was installing the inserts for the track drive motor plates into the frame for my Terramac RT7R I discovered that the idiot who put the 6 heat-set inserts between the frame rails never considered how it would be possible to fit over 150mm of soldering iron into an 80mm gap. What I finally did was to set the insert into the hole, I used the soldering iron to get the insert hot - but not try to seat it in the hole, then I used a piece of flat bar to seat the insert flush with the surface. The flat bar I used was a 6" piece of 1//4" x 3/4" HRS, I set the 6 inserts in less than 5 minutes and it barely got warm.
Don
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