Thread repairs in aluminum

ahollaway
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Thread repairs in aluminum

Post by ahollaway » Mon Dec 16, 2013 6:16 pm

I've read a lot about issues with damaged threads when tapping the rails.
From working in aviation I can suggest Heli-coil type inserts as a very reliable repair method.
It works in aluminum aircraft engines.
for example:

http://www.amazon.com/gp/product/B000WG ... d_i=507846

WillAdams
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Re: Thread repairs in aluminum

Post by WillAdams » Mon Dec 16, 2013 6:31 pm

Thanks! Those are _very_ cool.

I've added them to the wiki, w/ a link to your post (and also moved the Tapping information to the MakerSlide page, out of SO1 Assembly Step #8.
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twforeman
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Re: Thread repairs in aluminum

Post by twforeman » Mon Dec 16, 2013 8:00 pm

Oh yeah, Heli-Coils are great stuff. I've used them for engine repairs in aluminum blocks.
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northbear
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Re: Thread repairs in aluminum

Post by northbear » Mon Dec 16, 2013 9:22 pm

I will "third" that recommendation. We use them at work for aluminum parts that need to be adjusted or disassembled often. This way the threads don't wear out like they could with aluminum. They can also be used in plastic parts for the same reasons.
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Re: Thread repairs in aluminum

Post by Gadgetman! » Tue Dec 17, 2013 10:18 pm

How much larger are the tapped holes before the inserts are placed?
The walls in the Makerslide isn't all that thick to begin with, so one can worry that the walls ends up too thin and will deform when strain is placed on the bolt, or even when tightening the bolts.
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DevinTX
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Re: Thread repairs in aluminum

Post by DevinTX » Wed Dec 18, 2013 12:35 am

From what I can find about the repair kits that include a drill bit the overall size of the hole is #6 or 9/64 in

I hope that helps. Not in the shop where I can get a measurement

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Re: Thread repairs in aluminum

Post by cvoinescu » Wed Dec 18, 2013 1:15 am

Can't be 3/16, because that's only about 4.76 mm; if you're repairing stripped M5 threads, that's a 5 mm hole to begin with. For one manufacturer I could find data about, the drill is 5.2 mm; they don't say what the tap is, but I think it's M6 x 0.8 or very close.

Edit: While I was typing this, DevinTX edited his post to say 9/64 instead of 3/16, but that's even smaller (3.57 mm).
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Re: Thread repairs in aluminum

Post by DevinTX » Wed Dec 18, 2013 1:46 pm

I apologize for the incorrect answer. I am not a seasoned metric person and I follow Google when it comes to size relations from metric to inches. I read that The drill bit for the m5 fix is a #6 drill bit. Can anyone explain the relationship between #6 size and metric or inch equivalencies

Again sorry for the wrong direction

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twforeman
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Re: Thread repairs in aluminum

Post by twforeman » Wed Dec 18, 2013 2:33 pm

#6 bit is .204", or 5.181mm
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Re: Thread repairs in aluminum

Post by WillAdams » Wed Dec 18, 2013 2:38 pm

DevinTX wrote:I apologize for the incorrect answer. I am not a seasoned metric person and I follow Google when it comes to size relations from metric to inches. I read that The drill bit for the m5 fix is a #6 drill bit. Can anyone explain the relationship between #6 size and metric or inch equivalencies
Here's a chart:

http://bobmay.astronomy.net/misc/drillchart.htm

Please note that it doesn't cover all the traditional sizes (one also saw the bits in a brace and bit set numbered in 16ths --- a number 6 for such a set is 6/16ths or 3/8ths), but in this instance, a #6 is a size (0.204") from a Number and Letter drill set (also called a tap drill set).

Context is everything.
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