Peck Tapping

[cncfrank]

Hi all: I've read here that Mazaks are capable of peck tapping. We are trying to tap some pretty tough steel, and are going thru 1/8 - 27 nptf taps like crazy. I suggested a peck tap cycle, and they had never heard of it before. Does anyone know the code that's needed to do it on a Mazak Matrix control ?

 

Thanks,

Frank

[[email protected]]

I've never had any luck powertapping npt. I would use a threadmill if its applicable.

[Scott Garrison@Weiler Engineering]

Are you taper reaming 1st? That makes a big difference with pipe threads.

[cncfrank]

Thread mill really isn't an option because the thread is 3" into the part so I have to use a pulley tap. Anybody know where I could get a real good pulley tap ?

 

Thanks

[cncfrank]

Yes we are tapered reaming also.

[Scott Garrison@Weiler Engineering]

What material? We do S.S. here all day long.

[Scott Garrison@Weiler Engineering]

Emuge or OSG taps are what we use.

[Scott Garrison@Weiler Engineering]

Peck tapping is only going to help break the chip so unless you are having problems with chips peck tapping might make things worse. Are you breaking taps or are they just wearing out?

[cncfrank]

We are chipping teeth, and are changing for every part. The material is 4140 with a hardness of 32-38

[Scott Garrison@Weiler Engineering]

I'd try using oil instead of coolant or if not practical, really jack up the coolant strength to get more lubrication on that tap. Is it possible to just finish the tap by hand, just have the machine start the tap?

[Mjölnir]

OSG HY-PRO Taps and Moly-Dee tapping oil. Peck tapping will indeed help. Can't say how to do it on a Mazak though.

[robk]

Here is a sample from our Mazak with Matrix control;

 

quote:

---

(T11 .500-13 UNC-3B MOD TAP)

(TAP HOLES)

()

N11 T11 M06 T12

#3901 =#4114

G90 G80 G00 G17 G40 G98 G49

/7 M33 (LASER ON)

/7 G65 P9862 B1. T11 S3000

/7 M34 (LASER OFF)

G91 G28 Z0.

G00 G90 G54.1 P1 X-2.3600 Y2.3537 A-74.264 C-180.

S80 M03

G54.2 P1

G43 Z18. H11 M08

G84.2 X-2.3600 Y2.3537 Z12.5763 R13.6763 F.0769 Q.1

Y.1957

X2.3600

---

All you need to do is add the Q value (peck amount) into your G84.2 rigid tap mode.

[cncfrank]

OSG doesn't have a pulley tap for that. We are going to be running over 700 parts, and I wouldn't want the operator to stop and squirt oil, if it isn't nessasary.

[Mjölnir]

If you have a weldor with a clue, have him add extensions to standard taps. If not, find one.

 

Jokisch tapping paste is as good as Moly-Dee if not better. I machine a lot of tough pre-hardened alloys like P20, DH2F, Viscount 44, 4140HT, etc and would never consider using water soluble coolant for tapping them. That'd be just asking for headaches of migraine proportions.

[Dave Ball]

Make sure your coolant is around 13% and use an interupted thread tap, they skip every other tooth. I wouldn't bother trying to find a pully tap that meets the need, buy an extension.

[crazy^millman]

I would look to advent for a inserted tool holder that is a Cat40 or Cat 50 body holder and everything all in one. Like This one

 

Here is Linky:.

 

HTH

[Dave Ball]

Make sure your coolant is around 13% and use an interupted thread tap, they skip every other tooth. I wouldn't bother trying to find a pully tap that meets the need, buy an extension.

[Mjölnir]

quote:

---

I would look to advent for a inserted tool holder that is a Cat40 or Cat 50 body holder and everything all in one. Like This one ...

---

For 1/8-27 NPT?

[cncfrank]

When you are saying using 13% are you talking about Blaser coolant ? If you are, right now we are at about 10. Thanks for all the replies. I found an emuge tap that might work. I'll kick up the coolant % and still not sure if our Mazak has peck tapping. The manual says nothing about it. We normally use G84, but have used G84.2, but have never added a Q to it.

[GMM]

I like the OSG exopipe if the material is hard enough.

last time we had heat treated 17-4ph (33 hrc)I used the 15 deg spiral type.

Ran about 50 holes with molly-dee and I see little wear on the tap.

I have also tried the exotap-mold but they cost more.