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Z2V

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#3
How were you holding the tap? Were you tapping under power or by hand? Sucks to break a tap, especially a good one. :oops2:
 

Hukshawn

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#4
Power tapping holding the wrench. I got greedy. I felt it tighten up and let go and I stopped, but instead of backing out, I turned again, *clink*... effff.
5/16 - 18 dormer spiral flute
 

Z2V

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#5
Well, hopefully you don’t have too much trouble getting the broken tap out of your work. There’s something to be said for backing out a little when it starts getting tight!!!
 

Z2V

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#6
Wow, how did that happen? I promise, I’m not shouting, LOL
 

Hukshawn

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#7
Haha.

Nah, it’s a long piece of bar stock. I’ll just cut it off and do it again.
This is my first major swing at stainless... took me over an hour to get that step right and get as far as to break the tap... try again tomorrow, but, with a regular tap, cause that’s all I have left. Baby steps... baby steps...
 

magicniner

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#9
What grade of Stainless?
What Cutting Lube?
What % thread were you going for?
The Devil is often in those few details ;-)
 

mmcmdl

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#11
At least the back half of the tap is still good ! You can now make a pointer or small boring bar out of it ! ( look at the positives ) ;)
 

Hukshawn

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#12
Tap broke off right at the last thread. The other half is just a straight shank.

I don't remember the grade... It was blue and red.... Lol

The lube was the green goopy stuff.

I drilled the hole 17/32" so, slightly oversized for a 5/16-18.
 

benmychree

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#13
Tap broke off right at the last thread. The other half is just a straight shank.

I don't remember the grade... It was blue and red.... Lol

The lube was the green goopy stuff.

I drilled the hole 17/32" so, slightly oversized for a 5/16-18.
Next time try TapMagic instead of the green goopy stuff, and 303 stainless is a free machining grade that takes a lot of frustration away from working stainless; I used it extensively in my product line of winemaking tools in place of 304 with never a problem.
 

Hukshawn

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#14
It was 304. I emailed metals plus to ask what red and blue was since I couldn’t remember.
I grabbed it in place of drill rod for an indicator stand. They didn’t have drill rod on the shelves and I didn’t feel like paying for a cut.
I got it all finished tho. Also had to make a slitting saw arbor. Not pleased with the turn out of that. Has some run out I’d like to eliminate. So, when I have some more time I’ll take a bit more off the shoulder and do the final pass in the mill.
 

westerner

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#17
"Not quite the hotdog down a hallway" LOL. I know I have heard that before, but it is still VERY descriptive! Much similarity to my last attempt at creating a precision hole using an adjustable reamer!
 

Hukshawn

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#18
I’ve had ONE experience with adjustable reamers. Bought a set from busy bee tools, adjusted it to the size (no easy feat...) promptly broke it off in the hole, immediately brought them back, never looked back.... juuuuuuunk.

Maybe a quality kit would have been good, but I’ll stick with normal reamers,
 
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