Tapping Recommendations for a 2012 NHX4000

[jean]

Gentlemen, while I have good knowledge op taps I'm running into an issue with over loading when tap is trying to reverse out of hole.

We started out with standard 59/64 drill and a tapping depth of .920.... Spindle overloaded.

Moved to 59/64 drill and a tapered 1.0 EM with 1.5 Deg. Draft to reduce some of the load.... Spindle overloaded.

So next is to increase RPM to decrease spindle load but what is the safest RPM to Increase this to and generate more power..

If it all fails I'll thread mill.

Below is code I'm using.

( 3/4-14 NPT TAP  | TOOL - 4 | DIA. OFF. - 4 | LEN. - 4 | TOOL DIA. - 1.05 )
( TAPS HOLE ON B0. SIDE )
T4
M01
M6
M01
G0 G90 X1.5 Y10.25 S238 M3
G43 H4 Z12.
M8
G94
G98 G84.2 Z7.0853 R8.5407 F17.
G80
G94
M9
M5
G91 G30 Z0. Y0.
G30 X0. Y0.
G30 X0.
M30

 

Kindest regards,

Jean

[JParis]

Have you tried tried peck tapping to alleviate the chip build up?

[jean]

2 minutes ago, JParis said:

Have you tried tried peck tapping to alleviate the chip build up?

I don't have that Option on my Cut Parameters, Only Have Tap and Rigid Tap.

[JParis]

3 minutes ago, jean said:

I don't have that Option on my Cut Parameters, Only Have Tap and Rigid Tap.

I would dive into the books and see what the required code was for that particular machine...many just use the Q the same as a peck drill...add it to the code manually, if it works, go to the post writer and ask them to add the option moving forward

[jean]

1 hour ago, JParis said:

I would dive into the books and see what the required code was for that particular machine...many just use the Q the same as a peck drill...add it to the code manually, if it works, go to the post writer and ask them to add the option moving forward

I did some more digging and found it to be a Mitsubishi control so the "Q" is not an option. So I forced the peck cycle and it worked. 

But I'm still stalling out when spindle is ready to reverse out of hole.

[JParis]

I would try a shorter peck distance..if that doesn't work, the spindle may not be up to tapping an NPT of that size...

At that point I would I would look to threadmilling it and calling it a day

[jean]

1 hour ago, JParis said:

I would try a shorter peck distance..if that doesn't work, the spindle may not be up to tapping an NPT of that size...

At that point I would I would look to threadmilling it and calling it a day

Thanks for the feedback, we placed orders for thread mill..

Thank you.

[mayday]

3 passes with a thread mill, done

that's a big tap to drive on any machine

[cncappsjames]

Yeah... I'd threadmill that as well. That's a LOT of metal cutting surface area.