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Hey Orange_kun, The thermistor is installed only once and isn't removed. This specific joint in the plate bwlow was aubjected only to compression due to the initial preload of 10 lb-in.

I am adding several pictures. . https://files.engineering.com/getfile.aspx?folder=0922fe46-72aa-4285-ae40-ab2ae592408e&file=Screenshot_20240823-195020_WhatsApp.jpg

Hey again Brian Malone (Industrial) I thing there is enough place beneath the bolt for chips accumulation.

Thanks MintJulep (Mechanical) I know this Helicoil has other available lengths - 1D and 1.5D (I used 2D length). I guess that taking shorter Helicoil is what I will finally do, but I really want to understand what caused this failure .

Hey Brian Malone (Industrial) The lower piece was almost entirely tapped with the Helicoil tap and hence the insert can engage it. Indeed, as you mentioned - the Helicoil insert is for providing secure threads for mounting your thermistor. The thermistor screw does not create clamp force between...

Hey 3DDave (Aerospace) I agree that the threaded adhesive may fail due to shear, but I am not sure why it would spread radially. If it was a local teeth shear of the adhesive, I guess I wouldn't clearly see a separation.

Hey Stick, You wrote "I'd be concerned that rather than that single thread holding anything together, it may just serve to push the joint apart." In which scenario (and why) the single thread might push the parts apart?

Hey TugboatEng, The pre threaded hole was drilled through the 3 layers - Ultem/Adhesive/Ultem, and threading it was done at once, so I can't think why there might be misalignment between the upper/lower theead.

Hey Stress_Eng I will take a picture of it and upload it. The helicoil engage the pre-machined thread in the second (lower) plate, but as seen in the picture above - the engagement is minor and is about ~ 1mm. As seen in the picture, the helicoil engage a little bit (~1mm) the second (lower)...

Hey TugboatEng The adhesive has a quite close CTE to Ultem 1000. In addition the joint wasn't thermally loaded but was left in a room temperature.

Hello, I have a question about a thread which exists in a bonded joint. I am adding a simplified picture of such a joint, that we have some issues with: Please pay attention that the thread goes a little bit over the second lower bonded Ultem part. After manufacturing this joint (Including...

Hey, what do you mean by "nick resistant"? A-2 tool steel isn't sensitive to corossion?

EdStainless, thanks. Why did you suggest this particular coating? Is there any other alternative?

mfgenggear Thanks!

3DDave,thanks!

Hello everyone, I watched the milling machine worker measuring the upper surface of the machined part while it was still on the milling machine. He didn’t really pay attention to the dial indicator posture/position relative to the part and/or machine. I wonder if there is no importance to the...

Scuka You understood well and it seems to be you are right.

MintJulep and LittleInch Thanks for replying, you raised good points and questions. I don't have a lot of information since I am not familiar with all the details of this project. I just heard about their solution and wanted to know if anyone has heard of such a solution before.

Scuka You are right, but in this case they will have to make sure that 2 pins and hole and slot might bear the loads without failing.

JStephen, did you hear about such solution before? What about ruining the surface treatment and leaving the metal exposed to environmental effects?