[Tool Technician]

Just purchased new Haas VF9. Trying to tap m16 x 2 into A36 steel but keeps breaking taps. Suggested speeds and feeds? Parameter settings are okay to my knowledge. Should my cam add a code that switches this machine to metric during the rigid tapping process? I am using mastercam version 9 which does not have metric taps in the tool library. Rigid Tapping 2 inches deep into through holes using Nachi taps after predrilling holes with 14mm drill. Chamfer is .1 by .1 using Trim microsol 585xt coolant in my machine. Actual code given by mastercam


S200 M3
G99 G84 Z-2.0 R.1 F11.11

[txcncman]

NEED A LOT MORE INFORMATION!

Are you using MasterCam to program your NC code?

How deep?

Blind or through?

Actual NC code used?

Rigid or floating?

Actual type of tap used?

Actual measure size of drilled hole before tapping?

Chamfer size and angle of hole before tapping?

Coolant or lubricant used for tapping?

Concentration level of coolant?

[Tool Technician]

Just purchased new Haas VF9. Trying to tap m16 x 2 into A36 steel but keeps breaking taps. Suggested speeds and feeds? Parameter settings are okay to my knowledge. Should my cam add a code that switches this machine to metric during the rigid tapping process? I am using mastercam version 9 which does not have metric taps in the tool library. Rigid Tapping 2 inches deep into through holes using Nachi taps after predrilling holes with 14mm drill. Chamfer is .1 by .1 using Trim microsol 585xt coolant in my machine. Actual code given by mastercam


S200 M3
G99 G84 Z-2.0 R.1 F11.11

[txcncman]

With a 2 mm pitch, that equals 0.0787" travel per revolution. At 200 RPM your feed rate should be 15.74, not 11.11.

[Tool Technician]

With a 2 mm pitch, that equals 0.0787" travel per revolution. At 200 RPM your feed rate should be 15.74, not 11.11.

Thank you sir. What formula did you use to come up with that feedrate for future problems?

[neilw20]

Looks like inches/minute = 200*(2/25.4)
where 200=RPM
2=pitch in mm
25.4=conversion from mm to inches.
Is that correct assumption Mr txcncman?

In stainless I have found find an intermediate gun tap works well

[txcncman]

Yes, I converted mm to inches.

TAP FEED = RPM X TAP PITCH

[BOATDUDEGUY]

M29 for rigid tap if im not mistaken

[BOATDUDEGUY]

Also isnt 200 rpm a little fast for tool steel?

And this is in the woodworking section but with 3 posts I know it can be abit much using this site the first time
You would get alot more help in the right section
not that txcncman didnt

[dpotts]

I would peck tap it at .100-.15 at a time and run flood coolant instead of a tapping oil also..


EXAMPLE:
S200 M3
G99 G84 Z-.1 R.1 F15.74
G99 G84 Z-.5 R.1 F15.74
G99 G84 Z-1.0 R.1 F15.74
G99 G84 Z-1.5 R.1 F15.74
G99 G84 Z-2.0 R.1 F15.74
G80

[neilw20]

Just like you were taught when you tapped by hand.