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Hard Rubber Barrel Thread Crack And Loctite 480 Post Cure Clean Up

crack loctite 480

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#1 uilleann

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Posted 27 February 2018 - 18:02

So I have used Loctite 480 to repair 4 barrel and cap cracks.  3 of them were on the threads.  And it seems to work great even when there is tension on the gap from putting a section in.   The stuff is black and blends in pretty well with BHR but I just did a red swirl and it is pretty noticeable.  The only way I know of to clean it is to use a dental pick, a head loupe, and bright light to pick away at the 408 till the red shows through.

 

Is there a better way?   I would love to chase the threads but is there any tool that can chase multi-start threads?



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#2 FarmBoy

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Posted 28 February 2018 - 03:13

Use a lathe.  Chasing multi lead threads is no different than chasing single lead threads, you just chase each thread start one after the other.  Make sure you properly set up the part and it runs true.  I'd use a 4 jaw chuck and support the open (threaded) end with a steady rest or chuck it up very close to the threads.


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#3 Inkling13

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Posted 28 February 2018 - 18:12

Use a lathe.  Chasing multi lead threads is no different than chasing single lead threads, you just chase each thread start one after the other.  Make sure you properly set up the part and it runs true.  I'd use a 4 jaw chuck and support the open (threaded) end with a steady rest or chuck it up very close to the threads.

And if someone doesn't have a few thousand dollars worth of machines and tools rolling around, how is one to do that? 



#4 Greenie

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Posted 28 February 2018 - 19:07

And if someone doesn't have a few thousand dollars worth of machines and tools rolling around, how is one to do that? 

By hand. Slowly with a dental pick.



#5 praxim

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Posted 28 February 2018 - 22:47

And if someone doesn't have a few thousand dollars worth of machines and tools rolling around, how is one to do that? 

 

This way:

 

 The only way I know of to clean it is to use a dental pick, a head loupe, and bright light to pick away at the 408 till the red shows through.

 

:)


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#6 Rowbo

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Posted 01 March 2018 - 12:40

Try flossing


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#7 pen lady

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Posted 01 March 2018 - 13:37

Would it be possible to use an electric drill as a lathe if it was securely clamped in a vise or the jaws of a Workmate work bench?  Just a thought.



#8 FarmBoy

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Posted 02 March 2018 - 03:16

Would it be possible to use an electric drill as a lathe if it was securely clamped in a vise or the jaws of a Workmate work bench?  Just a thought.

It would be a bit hard to engage the lead screw.  

There are tools for chasing threads by hand.


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#9 Vintagepens

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Posted 07 March 2018 - 14:24

Standard thread angle is 60 degrees. Use a equilateral triangle needle file to clean up the threads. Break off the end and grind it sharp so you can also use it like a burin.

There is no need to use a lathe if the existing threads only need to be deepened. And if you are using a lathe, it's best to use it without running under power.







Also tagged with one or more of these keywords: crack, loctite, 480



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