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Broken Tapping Bit Help

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#1 Spud Spudoni

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Posted 02 January 2015 - 01:50 PM

Okay, so I need a little help approaching a problem:

I am working on a homemade with a Rainbow style catch. I had the catch in 1 1/4 PVC, and made my first drill into both the PVC and the polycarbonate to add my first screw. I began to tap the hole when the bit began to lock, and the turning device began to slip on the bit, as it was a pretty basic variant. I could not get it to grip the bit in order to twist it free, so I tried using pliers to help turn it free. As I tried to do so, the bit snapped inside of the PVC and polycarbonate. My problem is, how do I approach removing a broken taping bit that is inside PVC and polycarbonate?

Thanks,
Spud


Edited by Aeromech, 23 November 2015 - 01:33 AM.

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#2 rockinon96

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Posted 02 January 2015 - 03:43 PM

Okay, so I need a little help approaching a problem:

I am working on a homemade with a Rainbow style catch. I had the catch in 1 1/4 PVC, and made my first drill into both the PVC and the polycarbonate to add my first screw. I began to tap the hole when the bit began to lock, and the turning device began to slip on the bit, as it was a pretty basic variant. I could not get it to grip the bit in order to twist it free, so I tried using pliers to help turn it free. As I tried to do so, the bit snapped inside of the PVC and polycarbonate. My problem is, how do I approach removing a broken taping bit that is inside PVC and polycarbonate?

Thanks,
Spud



I have not come across this (as I have never make a homemade before), But My stepfather has these drill bits that actually drill out stripped screws out of things. It's called Speed Out. It can remove stripped screws, and broken bolts. I would assume that your tapping bit would be considered a broken bolt in this case. I would look into it. It is 19.95 USD and it comes with a lightbulb remover too.

Here is the link:

Speed out stripped screw extractor
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#3 SolarFusion

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Posted 02 January 2015 - 03:49 PM

If you can access the other side of the surface you were drilling you might try tapping it out with a small nail?
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#4 Spud Spudoni

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Posted 02 January 2015 - 04:30 PM

rockinon96: Yeah the bit that is used to drill a hole is a 7/64 bit. Very small. I really doubt I'll be able to get something in there to drill out the back of a broken bit that is less than 1mm thick.

Solar Fusion: Uh, yeah that could work, but in order to do that, I'd have to drill through the other side of the catch plate to access the front of the bit, and hammering it out would ruin the threading I put in there/possibly shatter the polycarbonate. I do not think you know the power needed to hammer out a screw from 1/4 inch thick polycarbonate without it being put into pieces.
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#5 rockinon96

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Posted 02 January 2015 - 05:39 PM

rockinon96: Yeah the bit that is used to drill a hole is a 7/64 bit. Very small. I really doubt I'll be able to get something in there to drill out the back of a broken bit that is less than 1mm thick.


Well, maybe not the speed out brand, BUT I did find one for that MIGHT get the job done. I found it on amazon.

Forgive me if it wouldn't work.

Irwin Industrial (amazon.com)


If that even won't work... can't say I didn't try.
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#6 Spud Spudoni

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Posted 02 January 2015 - 05:52 PM

Well, maybe not the speed out brand, BUT I did find one for that MIGHT get the job done. I found it on amazon.

Forgive me if it wouldn't work.

Irwin Industrial (amazon.com)


If that even won't work... can't say I didn't try.

The problem with this is I have to drill into the bit in order to extract it. I feel like the drill bit will just take the path of least resistance, and just tear up the PVC around the broken bit instead of drilling into it. Thanks for the feedback, but it looks like it's time for a rebuild...
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#7 Spiderbite

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Posted 02 January 2015 - 08:05 PM

I have encountered this problem before when I was making my first +bow. There was very little tap above the nylon rod where it broke and it was impossible to get the tap out. I ended up just scrapping the rod and buying a new tap. Taps are made typically of Carbon-steel; they're not going to be too friendly for drilling into for removal.

What I will recommend for the future, is to lubricate the tap with something, even hand soap, to have it tap more easily in tough materials like polycarb and nylon.
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Or hell, Spiderbite has sweet deals on this stuff now, so there's really no reason not to Rainbow.

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#8 snakerbot

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Posted 02 January 2015 - 09:44 PM

The problem with this is I have to drill into the bit in order to extract it. I feel like the drill bit will just take the path of least resistance, and just tear up the PVC around the broken bit instead of drilling into it. Thanks for the feedback, but it looks like it's time for a rebuild...

You may be able to save the catch by dremeling the pvc around the bit until you can grab it with pliers or something.

What I will recommend for the future, is to lubricate the tap with something, even hand soap, to have it tap more easily in tough materials like polycarb and nylon.

You're also technically supposed to stop and back up the tap to break the chips. Every turn or so turn the tap back 1/4 turn. This helps clear the cuttings out of the threads and into the flutes of the tap. It often isn't necessary when tapping plastic, but it can't hurt.
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#9 Spud Spudoni

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Posted 02 January 2015 - 10:23 PM

You may be able to save the catch by dremeling the pvc around the bit until you can grab it with pliers or something.


Yeah I did do that with a drill, drilling two holes and sorta reeming around one side of the original hole, until the broken taping bit was able to fall out of the hole in the PVC shown here:
Posted Image

Posted Image
I was then able to use needle nose pliers to twist the taping bit out of the polycarbonate. So damage isn't as bad as I thought.
Thanks for the help guys,
Spud

Edited by Spud Spudoni, 02 January 2015 - 10:24 PM.

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#10 flyingchicken

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Posted 03 January 2015 - 12:11 AM

Maybe it wouldn't have broken if you hadn't stopped coming to wars.

YOU LEFT US WITHOUT SAYING GOODBYE.

Jerk.
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#11 Spud Spudoni

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Posted 03 January 2015 - 12:37 PM

Maybe it wouldn't have broken if you hadn't stopped coming to wars.

YOU LEFT US WITHOUT SAYING GOODBYE.

Jerk.

Why do you think I'm making this?!? I'll be closer than I used to be to Georgia this summer, so y'all plan the day, time, and wind speed and I'm there!
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