Post Processor

[efred5]

Can anyone help me figure out how to capture the threads per inch value from the tool parameters page, so that I can use that number to base my tap rpm on. The operators want the feed rate to be a set value of 10. (inch p/minute). ex:1/4"-20 tap would post out: G98 G84 Z-** R.** S200 F10.

I have the feed rate established, but I need to get the tpi to finish the formula.

 

thanx, efred

[efred5]

ps: Version 7 mill level 3 (does anybody remember this one?)

post is based on MPFAN.

[chris m]

No help with your actual question but I must say that I think that it is bass-ackwards to have all tapping at 10IPM paying no attention to the surface speed of the tap; is there any logical reason behind this?

 

Chris teh WTF

 

C

[Guest]

the variable in n_tap_thds

[Glenn Stephens. from CCCS]

Should be n_tap_thds.

[Guest]

Glenn:

 

Running a little slow today?

[Glenn Stephens. from CCCS]

Had to confirm spelling in the .pdf's

[efred5]

Bass-ackwards yes, but this is how they want it.I think that this comes from the old school days of floating tap holders. I prefer solid rigid tapping at recommended sfm, but I'm not gonna fight this one; I'm already battling for a Bar Code Scanner System.

[mold100]

I worked at a place they ran taps like that 1/4-20 and under 3 imps and over that 5 ipms I prefer ipr and variable spindle speeds depending on mtl'(rec SFM)

[mike_f]

Sounds to me like its time for some new operators. Lots of people out of work.

[Müřlıń®]

quote:

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I worked at a place they ran taps like that 1/4-20 and under 3 imps

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I manually tapped 500 1/4-28 holes 1.5" deep on a little mini drillpress with a micro reverse switch on it, at around 500 RPM........took about 1.5 seconds a hole in 440 SS flooded in oil didnt break one tap.....infact...used the same one.....

 

 

Murlin

[KMaynard]

quote:

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I manually tapped 500 1/4-28 holes 1.5" deep on a little mini drillpress with a micro reverse switch on it, at around 500 RPM........took about 1.5 seconds a hole in 440 SS flooded in oil didnt break one tap.....infact...used the same one.....

 

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you my friend are a brave man ..

[efred5]

Thanks guys for your help! Funny thing is that this 10 ipm is an upper mangmnt call. And this is the 2nd or 3rd place I've been to that uses this 10 ipm base for tapping. (I would guess that is why those guys are not around anymore. Ha!? Ha!?)

[CAM-mando]

quote:

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10 ipm is an upper mangmnt call.

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Yeah ... I always check my speeds and feeds with upper management

[Brendan P]

If I understand you right,you want every tap to feed at 10 ipm?

If this is so,after you pick your tap,input your 10.0 feed-rate and the speed will automatically calculate it for you in the tool param. page.

[Harryman]

10 IPM is the common choice simply because it's much easier to assign that feedrate and calculate RPM, than it is to calculate RPM based on cutting speed then calculate feed rate. Pure math lazyness.

 

So what do you call it when MC does all the work and they still don't want to go with the right numbers?

[chris m]

quote:

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Yeah ... I always check my speeds and feeds with upper management

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LOL Dave, I heard that

 

Chris teh I tell the machine what to do; just run it

[crazy^millman]

Wow upper mangement that doesn't say a 5 day job can be done in 5 hours. That is unheard of they don't want to make money and profitable. I wish I worked there and could milk it but then I would problay have to shoot myself in the head so I think I would juts have to pass. Good luck and hope it all works out.

[PE @ IHS]

If they are too lazy to do the math, then tap in ipr instead of ipm. This way, no matter what the rpm is, the feed will equal the pich (i.e. 1/4-20 will have a feed of .05", no matter what the rpm.)

 

But don't take my word for it, I am just a dumb sales monkey

[Jimmy Wakeford from Barefoot CNC]

Peter

Your in sales? Your too smart for that. Maybe you just like the absuse?

 

Jimmy teh me too

[chris m]

quote:

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then tap in ipr instead of ipm

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Not an option in some older machines, Peter. Or maybe it was an option and we just didn't but it.

 

This tap feedrate thing is almost as good as the guy who told me that he has to program the finish face of all his parts as Z-.130 because the operators can't figure out how to account for their .100 block and the .030 that's coming off the face when they touch off...

 

Chris teh remind me to ask for a typical program hardcopy at my next job interview...

 

C