ljeremy578
Plastic
- Joined
- Aug 6, 2018
Can anyone recommend a good holder for rigid tapping in a lathe? I am going to do alot more tapping and need to good tool life.
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I tap 2" 11 1/2 pipe thread in my lathe. Stick the end of the tap in the bored tapered hole. Live center in the end. Crescent wrench on the flats on the tap with the wrench end on the cross slide on a leather welding glove. Lathe in low gear. Lube the heck out of it and go. Bump on and off. Put slight pressure on the tail stock while starting, after a few threads it will feed itself. Continue lubing and bumping on and off. Has worked for me. Good luck.
Greetings,
GenSwiss stocks some pretty nice floating tap collets that fit various sizes of ER.
( Floating Tapping Collets for CNC Machines - GenSwiss )
I've used the ER-20 sizes for years with great success.
I've been told (but don't do it myself) that the best way to use them is to underpitch the thread pitch very slightly (0.03120 instead of 0.03125 for 32 pitch for example) That causes them to expand on the way in, and retract on the way out, to let the tap float its own pitch.
I didn't know that to start, and got great results with just doing the pitch accurately, so I can't see any reason to change. But I pass along the knowledge anyway.
FWIW
Brian
Unless that is a very new machine,and something has changed. Most lathes do not "rigid" tap with the lathe spindles. If you want to rigid tap on-center you will have to use an axial driven tool.
If you must use the lathe spindle you will have to use a tension compression type holder. Just like the good ole days.
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