Tapping Question

[Namliek_J@TheeCircle™]

I am tapping a bunch of blind holes that are drilled .8 inches deep and tapping with a 10-32 sprial point 2 flute Elektralube tap. I am tapping Aluminum 6061, and I keep breaking taps. I had this problem before when I was tapping SAE 1141 with the same setup with no problem, but not I am getting broken taps. Any ideas on how to tap them better or more efficiently?

[John13]

form tap??

[Guest]

If it's not a thin wall, I agree with John, I'd roll form it.

[toolall1]

drill a little over go to 68% thread, should still be a decent class 2 fit

[connormac]

+1000 on form tap.

[JNO]

Form taps are definitly the way to go with aluminum. We form tap all of our holes and rarely have problems.

[J Coulston]

+1241.1

 

Form tap.

[Namliek_J@TheeCircle™]

Thanks for the info guys. I just ordered some Guhring Form taps. I am gonna use them mostly for SAE 1141. I heard that they are the way to go for most materials when dealing with blind holes becuase of the no chip factor.

[Thee Dragracer1951]

Either form taps or spirol flute taps...pulls the chips out of the hole

Jim

[Namliek_J@TheeCircle™]

Just got the new form taps in this morning. hopefully gonna try them out this afternoon. thanks for the info guys.

[Fig sign]

This happened to me once in Mori-seiky long ago .

On one specific machine .

We were breaking taps in holes .

On all the other similar machines same program -OK

We were using floating holders -go figure ? :headscrath:

The end of story -soon we found that spindel bearings were bad .

So there is an easy explanation -on reverse backlash of bad bearings pull the tap up and Ka-boom !

[Joels]

Where do you get guhring thread forming taps at?

[John13]

I've gotten them thru MSC before