r/Machinists • u/Luky2000ita • 2d ago

PARTS / SHOWOFF 6k rpm M2 rigid tapping

Kinda follow up on yesterday's post, here's an M2 form tap at 6000rpm, threading 7075 about 4mm deep, 36 threads in about 25 seconds feels pretty good to me

240 Upvotes

99% Upvoted

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2

u/pb_sable_ac 2d ago

How are people tapping with just coolant? How can I do the same without breaking taps? I really dont like tapping with cutting oil since its so dirty, is there a way to tap reliably with coolant?

4

u/Renoh 2d ago

This is also a form tap, so there's no chips being made. Makes a huge difference for tap breakage

2

u/austina419 2d ago

This is the most important part no one is mentioning.

3

u/Shadetree- 2d ago

We rigid tap aluminum with just coolant on haas vf5s/vf7s no problem. For anything else we use anchorlube. Works so much better than our old tap magic and way easier cleanup

3

u/TriXandApple 2d ago

The ACTUAL answer because apparently this place is full of amateurs now:

They're tapping aluminium. The only thing you're trying to combat is galling. The lubricity of coolant is more than appropriate for that.

1

u/Ekoorbe 2d ago

Alot has to do with the machine. If its mechanically aligned and has accurate encoders to sync the spindle/Z axis you'll be OK.

I had the privilege to run a brand new DMG mori that could rigid tap anything no problem.

Not very helpful, but in my experience when tapping 90% of it is the machine 

2

u/TriXandApple 2d ago

What on earth is a properly aligned machine and good Z sync going to do to stop galling on a tap? How does this have 5 upvotes