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Unidentified tap??

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JoeK

04-22-2002 13:26:14




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Sortin thru some garage sale"junque" boxes/cans and came across what I first thought to be a tap,but ???..It looks like a tap,about 3.5 in long with flutes and cutters like a tap,BUT it is appx 1/4" at the bottom tapering up to 7/16 or 1.2 at the top.Tip is blunt,"Threads" measure the same all the way up(NC?).Flat full width 1/2h tang on top about 1/4" thick.Stamped'14'on side of tang.Looks like it would have been used with a wrench type tool rather than any "tap handle/chuck"I've seen.

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Lance R

04-24-2002 12:33:14




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
It could be a production tap used in Mfg parts. The Co. I work for has CNC Lathes, CNC Mills, & Machineing Centers. Some unusual tooling is purchased to do the job requirement. My 2 cents!



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JoeK

04-24-2002 12:29:30




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
This is not any kind of easy out I've ever seen,definitely right hand thread,cutters and flutes(4)run full length to head and are same pitch with no breaks full length.The odd thing is the length and amount of taper,appx 1/4 to 1/2 tip to head.When I get a minute I'll try to mike it and measure it more accurately and repost.



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kraig WY

04-23-2002 22:35:04




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
Hey, maybe you got into my junk drawer. I've made a lot of taps when I was too lazy to go to town or figured I would only use it once. Some I mark, some I don't. Maybe marked it to reference what ever project I was working on at the time. Howell's "The Modern Gunsmith" has a lot of information on making taps, dies, etc.



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T_Bone

04-23-2002 18:12:02




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
Hi Joe,

Theres a tapered pin that comes off a cotton picker head that looks some what like a tap. There chromed and I can't remember the correct name for them about 5" long. Can't remember what it does on the cotton picker.

First time I seen one I thought it was a tap til I got to look-in at it.

T_Bone



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Rod (NH)

04-23-2002 11:17:40




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
Hi Joe,

Hmmm...interesting tool. The "14" stamped on the tang would seem to refer to the threads per inch. Have you actually measured the tpi with a pitch gage? 7/16-14 is a standard UNC thread. 1/2-14 is a standard pipe thread but the diameter would be significantly larger than you indicate for that. It would have to go up around 0.84" since that is the OD of 1/2" pipe. If you confirm the 14 tpi, I would guess it has something to do with a 7/16-14 UNC tap but I can't say I have ever seen one with that much of a taper to it. They do make tapered taps with more of a taper than the standard plug tap but still, the taper is only over 8-10 threads.

Rod

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MikeEnglebrecht

04-23-2002 09:57:17




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
If it cut a reverse thread it could be an easy-out for removing broken bolts. There are also I believe easy outs for left hand threads. You drill a hole and screw in the easy out untill it grabs the bolt and turns it out.



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Al English

04-23-2002 05:38:00




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 Re: Unidentified tap?? in reply to JoeK, 04-22-2002 13:26:14  
Tapered threads..... .is it a pipe tap?...Al English



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JoeK

04-23-2002 09:24:23




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 Re: Re: Unidentified tap?? in reply to Al English, 04-23-2002 05:38:00  
Don't believe so,too long and too much taper in my estimate,Tip would fit inside 1/4 pipe and top would be too big for 1/4 fitting.Went thru pics in McMasters,Grainger,MSC and can't find anything like it.Machinist friend looked at it and has no idea either.



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Mickey

04-23-2002 18:07:16




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 Re: Re: Re: Unidentified tap?? in reply to JoeK, 04-23-2002 09:24:23  
It may be a Blacksmiths' Taper Tap or Machinists' Hand Taper Tap. 14 would be the threads per inch for 7/16". The head is the difference between the two. The machinist tap has a smooth area between the threads and where you put the wrench. The blacksmith tap is threaded all the way up to the square top. Blacksmiths used to get plain machine nuts and thread them to the threads per inch needed. I'll try to e-mail you a picture of them out of a 1900 catalog.

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