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Old 30th November 2003, 03:06 PM   #1
Doh is offline Doh
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Default Never want to break a tap again? Nut inserts!

Hello everyone,
I'm currently in the process of putting together the chassis for my APOX kit. While I was shopping McMaster Carr for hole taps and drill bits, I came across some stainless steel threaded nut inserts. (McMaster Part number 98560A526) I think they are also called A-T series nut inserts.

Does anyone have any experience with these? If they work, they seem like a fool-proof way of creating threaded holes without the possibility of breaking taps etc.

I think that, instead of buying the very expensive installation tool, it would be possible to install these with a suitable length screw, allen wrench, and something to use as a spacer like a drill bushing (McMaster part number 8509A11, for example)

Thanks in advance!

Doh
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Old 4th December 2003, 06:42 PM   #2
Magura is offline Magura  Denmark
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Hmm...cutting thread actually isnt that big a deal.....

Just make sure you use the right lubricant.

For steel, brass, copper and titanium, use cutting fluid( rocol and others).

For aluminium, use alcohol.

If done like that you should never brake a tap......that is if you remember to buy a new one now and then....old taps are bound to brake sooner or later (mostly sooner)

Magura
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Old 4th December 2003, 07:04 PM   #3
Doh is offline Doh
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Thanks Magura,
I ended up deciding that drilling a small hole was quite a bit more preferable to drilling a big one and using a nut insert. I used Peter Daniel's technique of using a drill gun, with a makeshift drill guide and the holes came out beautifully.

Doh
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Old 4th December 2003, 07:05 PM   #4
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If you chassis is Aluminium, and relatively thin skinned, the threads won't last. Inserts is the way to go in that case.

Petter
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Old 4th December 2003, 07:08 PM   #5
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Anything that is 1/8 " , or so, is not a problem. After all you assemble it only once, right?
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Old 4th December 2003, 07:11 PM   #6
Magura is offline Magura  Denmark
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sure....once a week

Magura
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Old 4th December 2003, 07:15 PM   #7
Doh is offline Doh
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I think the threads will be ok. I'm using 3/8" screws to hold a 4mm panel (without threads) to the back end of my APOX chassis. For most of the chassis, I elected to use epoxy to hold the panels together, as the sides are made from 1/2" aluminum bar. I'm incredibly pleased with the way the project has come together and have posted pics in the APOX thread just to show off.

http://www.diyaudio.com/forums/showt...106#post276106
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