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razmosis13-Aquamarine
13-Aquamarine
January 26, 2015
Question

Tapping in Creo

  • January 26, 2015
  • 2 replies
  • 4980 views

I am having some trouble with tapping some parts. I am normally quite comfortable with threadmilling, but have done very little tapping because I am typically threading bigger holes. I am trying to tap a set of 10mm-1.5 pitch and 8mm-1.25 pitch holes. The holes go all the way through a 1" thick part which I would estimate to be around 38 HRc. The holes were predrilled to .335" (8.5mm) and .265" (6.75mm).

The posted tapping code for the 10mm-1.5 comes out like this:

T7

M6

T8

S60M3

G0X1.2303Y-2.1309

G43Z3.H7

G84X1.2303Y-2.1309Z-1.1787R.025P2000F90.

We tried to run it and the machine alarmed out and the tap broke. I am not sure what the Feed Rate of 90 is there for at the end of the G84 line. Does anyone see anything amiss or know of a tapping tutorial I could look at to see if there is something I am doing wrong? It seems pretty straight forward. The only other thing I've tapped in 3 years was a 1/4-20 in cast aluminum. That went fine, but it probably wouldn't have matter how fast that was going either.

Thanks!

2 replies

S
SteveLucas1-Visitor
1-Visitor
January 26, 2015

Matt,

I just tapped a bunch of 10-32 holes this morning here is what the code looks like.

T8

M6

S100M3

G00G90X-4.4125Y-3.95

G43Z.1H8

M135S100

G84G95G99X-4.4125Y-3.95Z-1.125R-.62F.0313

I think you are missing some info like the G95 which is the thread feed in inches per revolution in my case.

Fanuc control

Steve

R
razmosis13-AquamarineAuthor
13-Aquamarine
January 26, 2015

Steve,

This is an English unit mfg session, but these features of the part happen to be metric. I have the thread feed parameter set at 1.5 MMPR. Maybe the English/Metric hybrid is an issue?

S
SteveLucas1-Visitor
1-Visitor
January 26, 2015

Matt,

I think you need the G95 in the G84 line is what I was pointing out for the feed not to read ipm or mmpm

J
JasonPensack1-Visitor
1-Visitor
January 27, 2015

Hey guys,

I believe this is a gpost problem. I think you have to have a section in your FIL to tell it how to convert the MMPR to IPR. When I tap a Metric hole I convert the pitch to english and set it as IPR. M4 x .7 = .02756 ipr.

As for the G95 and G94 for tapping. On our Haas machines I use IPM so I didn't have to add anything to the post. But on our Makino A55's we use ipr so I had to create a FIL section to get this to work. They also need an M135 S#### on the line right before the G84 so that required FIL work as well. I was shocked that there weren't radio buttons on the Option File Generator side of Gpost to control the output.

S
SteveLucas1-Visitor
1-Visitor
January 27, 2015

Jason,

If you look at the few lines of code I posted I have the M135 in there but I don't recall what it is for? Maybe you need the M135 and the G95 for IPR feed? been quite a while since I have looked at my Post processor so I could have the fil set for tapping. I believe I remember doing the conversion for metric like you have in your post. I rarely do metric threads so I can't imagine that I would do anything other than the conversion.like you have.

Steve

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