View single post by JAMMAN

Posted: Sat Nov 2nd, 2019 09:40 am

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JAMMAN
Owns A Torsen

Joined: Mon Sep 18th, 2017

Location: Grove City, Ohio USA

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They both have their usages. I have never heard the term "timesert" I know them as "Keenserts". The biggest place helicoils are a no nos in applications where the hole is WAY worn, outside the drill size for the helicoil. There is another kind of insert like a keensert that has no tines (maybe it is supposed to be a "tinesert"?) that some german manufacturers use to make threads stronger in aluminum. No tines means they can effectively be removed and replaced.

The advantages of Keenserts and the german style is they use standard tap sizes for the insert. One might think this isn't a big deal but when you only have one helicoil tap and some butt plug has borrowed it thinking it was a regular tap dulling the living crap out of it without your knowledge... then you have a project that has to go out...

A dull helicoil tap can produce a situation where the helicoil can be inserted but the end result thread is too small and the bolt gets bound up.

Been a machinist since early 80's I've endured all of this multiple times.

Because helicoil taps are a special grind they are not produced in the masses that regular taps are. They are often weaker and harder to obtain.

So both have their uses. A helicoil tapped wrong or inserted wrong or if the coil is too long or too short for the hole can be a big problem. Keenserts are no brainers but there is often not enough room to drill the larger hole required for them.

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