[glovebox20]

Hello.

I've found out on a Haas VF mill, I can program the feed rate on a 1/2-13 tap by going F[1/13*#4119]. But when I try this on a Fanuc OM control, I get a #201 alarm (no feed rate for rigid tap). So I tried:

S400 M84
#100=#4119
G84 Z-.95 R.05 F[1/13*#4119]

And I got the same alarm (201). Variable #100 was set to 0.

So I tried this:

#100=400
S#100 M84
G84 Z-.95 R.05 F[1/13*#100]

And it worked fine.

As I understand #4119 is the last command spindle speed. But it apears that I can't read it. I'm trying to come up with a easier way to program the feedrate by using the pitch of the tap so if I change the RPM, I wouldn't have to worry about updating the feed rate.

Is my systax wrong?

Thanks for the help.

[duivenhok]

try
S400 M84
#100=#4119 (dont understand why you would want to make #100 same as #4119)
#101=[[1/13]*#4119]
G84 Z-.95 R.05 F#101

[glovebox20]

Found it!

For some reason the M84 clear the current spindle speed command to 0.

A work around can be achieved by:

S400
#100=#4119
M84
G84 Z-.95 R.05 F[1/13*#100]

[gbowne1]

We use a NC calculated feedrate and speed on especially our large taps. We use so many different style and type of taps and in a wide variety of materials that it became necessary to use the NC to calculate feeds and speeds. Oh and we have just about as many methods for tapholding too for ease of programming and setup. Rigid and floating, collet and tapping unit, tension/compression

Same with certain milling cutters, a medium size Niagara shell mill, etc.

Were also running 75-100% threads.

That being said, I prefer using the G84 ..

O1234
S400 M3
M84
G84 Z-.100 R.015 F(NC calculated)

Generally its 16tpi

And lately we're helical threadmilling in interpolaton. Using a troichoidal in a test too.

Anyone got a program for a 1-1/8" standard NPT thread in a 1" A36 plate?

[glovebox20]

We use a NC calculated feedrate and speed on especially our large taps.

O1234
S400 M3
M84
G84 Z-.100 R.015 F(NC calculated)

What do you mean by 'NC calculated'?

[gbowne1]

The actual feed values are calculated by the CNC.

We're doing this because in testing results in tapping were so widely varied from hole to hole.

Having the CNC calculate the feed,dwell, speeds, etc. dramatically increases the quality of the tapped holes. Though we started out with manufacturer reccomendations.

Lately we're using Kennametal / Greenfield spiral taps in the blind holes in a Tapmatic 50X.

May not be the best approach but it works.. so far.