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Tool Talk Discussion Forum

drill size for thread FORMING taps

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Don-Wi

08-24-2007 01:49:40




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I was wondering where I can find a drill chart to be used wiht a thread forming tap, not a thread cutting tap.

We've got a couple forming taps at work and I think I'm about the only guy who knows about them,(so I'm a snoop- about the only way I find out about some things) and I want to do some experimenting with them but I don't know what size drill they require.

Donovan from Wisconsin




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Spook

08-25-2007 03:13:23




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
We use a lot of them at work. Takes a lot of HP, proper lube, and a ridgid setup. They can't be allowed to float like a cutting tap. Usually used in alum.



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BigMarv1085

08-24-2007 15:46:08




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
Do a search on the internet for drill tap sizes or even starrets. Usually on the tap it will have the drill size on it.



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Don-Wi

08-24-2007 18:18:25




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 Re: drill size for thread FORMING taps in reply to BigMarv1085, 08-24-2007 15:46:08  
I did a search last night but every drill chart that came up was for a cutting tap instead of a forming tap. I've only seen drill sizes on the taps a regular joe buys at the hardware store, and not on the ones we use at work (machine shop).

That was when I turned to the guys on this board.

Donovan from Wisconsin



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jhill52

08-24-2007 08:39:37




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
Look in the Machinerys Handbook. Should be there.



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Vern-MI

08-24-2007 04:41:18




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
They cold form the metal threads and therefore require a lot of lube / coolant and the correct speed for the material and tap size being used. The advantage is that they form the threads with little or no chipped material.



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Don-Wi

08-24-2007 10:23:38




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 Re: drill size for thread FORMING taps in reply to Vern-MI, 08-24-2007 04:41:18  
I know how they work and the advantages of useing them, I just needed a drill chart to reference to them. I've only got the students machinery handbook right now and they don't cover forming taps in it.

Donovan from Wisconsin



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Vern-MI

08-25-2007 05:18:19




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 10:23:38  
Then try this...



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john pop 1

08-24-2007 03:43:23




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
Be very careful when using a threadforming tap. They are designed for soft materials like plastics and some aluminum. They are, as their name implies,a forming tap and not a cutting tap. An example of the difference is 7/16-14 tap. If you are using a thread cutting tap, the recommended drill is a U (.368") whereas with the same size thread forming tap the recommended drill is a Y (.404"). I hope this helps. I have a complete set of thread forming taps and several sets of thread cutting taps and have a fair idea of how to use them.

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aland

08-24-2007 03:24:44




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
pg 2019 of the J&L catalog. It is in the back under technical information. Hole sizes are drilled larger than standard tap drill sizes and threads are formed rather than cut. It works good in mild steels but will not work in tool steels or cast iron. I will make an attempt to attach a link.



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Don-Wi

08-24-2007 10:21:27




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 Re: drill size for thread FORMING taps in reply to aland, 08-24-2007 03:24:44  
Thanks!! That's the only straight answer I got for the question asked so far.. And it gave me exactly what I was looking for.

Donovan from Wisconsin



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aland

08-24-2007 03:25:46




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 Re: drill size for thread FORMING taps in reply to aland, 08-24-2007 03:24:44  
try this link:

http://catalogs.shoplocal.com/jlindustrial/index.aspx?pagename=circularlarge&fsid=&storeid=1038424&loggedin=false&itemcount=0&epcode=&circularid=7228



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midwest redneck

08-24-2007 02:45:04




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 Re: drill size for thread FORMING taps in reply to Don-Wi, 08-24-2007 01:49:40  
I think that the drill size is the same as a regular tap. If you think about it a form tap vs. a regular tap is the same OD and ID, regarding pitch/thread%/thread engagement. if the tap is a smaller size like under 1/2" then tap 2 holes with the same drill and 1 of form tap 1 with regular and see if it works.



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Ryan - WI

08-24-2007 05:26:59




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 Re: drill size for thread FORMING taps in reply to midwest redneck, 08-24-2007 02:45:04  
A forming tap will have a larger tap drill size. The way they work is to take the material that is where the peaks will be an push (form) it over and make it fill the space that is the valley. Because of that the tap drill size is slightly greater than the average of the major and minor diameters. If you use a minor diameter tap drill (like is used in cutting) you will break the tap, guaranteed.

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