One way to do deeper tapping is to do it first with regular tap and then use another one with trimmed end. Worked fine for me. I'm using cordless drill gun with a clutch for tapping. You can save yourself a lot of frustration by using it.
If there is an interest I can post some pics in Useful Techniques thread.
If there is an interest I can post some pics in Useful Techniques thread.
I have tried using my 8" Drill Press , just had to remove a belt and rotate the head which instead of drill mounted had tap and wola. I have been using as well an "Aluminium cutting liquid 09" which really does the job. Controlling the pressure by other hand and that's it. It worked for me.
Peter please post some new pics, I am eager to see your advice always. Pictures are always saying more than words.
Trigon
Peter please post some new pics, I am eager to see your advice always. Pictures are always saying more than words.
Trigon
Do be careful when tapping small holes with a drill! I've broken numerous #8 taps with the Dewalt on low speed and the clutch at minimum. 
I started using the drill only for 1/4" and larger holes in aluminum and plastic. With a little practice, tapping small holes by hand is pretty easy. Starting with the correct hole diameter is essential. I prefer being able to feel the resistance so that I don't break the tap or gall the threads. But that's just me
now, try tapping a 6" long rod of 1/2" unleaded brass on a lathe... Took -30dB ear plugs to stand the screech despite copious amounts of real cutting fluid. All to save $5.00US on a piece from McMaster!
Agree with the "Clipped Tap" method
For all the fastener information you could want, including tap drill diameters, check outAmerican Fastener's Tech Charts.
Regards,
Mark Broker
I started using the drill only for 1/4" and larger holes in aluminum and plastic. With a little practice, tapping small holes by hand is pretty easy. Starting with the correct hole diameter is essential. I prefer being able to feel the resistance so that I don't break the tap or gall the threads. But that's just me now, try tapping a 6" long rod of 1/2" unleaded brass on a lathe... Took -30dB ear plugs to stand the screech despite copious amounts of real cutting fluid. All to save $5.00US on a piece from McMaster!
Agree with the "Clipped Tap" method
For all the fastener information you could want, including tap drill diameters, check outAmerican Fastener's Tech Charts.
Regards,
Mark Broker
When done properly it's impossible to brake a tap. I just tapped some holes while doing pictures. See the results: http://www.diyaudio.com/forums/showthread.php?s=&threadid=3981&perpage=15&pagenumber=7
See the results: http://www.diyaudio.com/forums/showthread.php?s=&threadid=3981&perpage=15&pagenumber=7- Status
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