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Electronicals / Forscan Expert
Joined: Fri Nov 24th, 2017
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That's what it should feel like when you do TTY bolts on the heads....good news! Helicoils are a life saver
It was my first time using one in such a high torque application. Actually had me worried because most videos or posts I see say Time Serts are better. So I decided to dig into this.
What I found is the first few videos on YT are from a guy saying time serts are better. Well he sells time serts and I'm sure the profit margin is higher on those.
Helicoils are listed in NASA technical documentation, Time serts are not.
I've found that people say that the helicoil being a wound wire is a con, but it turns out it isn't as it's ability to "breathe" and move helps it hold more force. This movement allows for inconsistencies in cut threads. Also found out that a bolt in a solid insert or sold hole has 75% of the force on the first 2 threads, but if using a helicoil 80% of the force is spread across the first 4 threads.
Also found a machinists that did torque and pull out force testing of different ones, and the helicoil performed well, even better than the time sert. Check it out when you guys have time. Very interesting.
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