peck tapping

[Elad]

did anyone tried it??

how do i post it??

[jeff]

There are a few threads about peck tapping around november of last year,

try doing a search.

HTH

[Guest CNC Apps Guy 1]

Hello Elad,

 

There's some good threads about this in the not too distant past. Basically it will come down to if your control can do it or not.

 

Do a search on Peck Tap

 

HTH

[Elad]

Thanks.

[mold100]

This is a coincidence, just today I spent all morning tapping 1/2-13 and 10-32 holes in 56rc S-7.

I thought about peck tapping,but instead tried new tooling.O.S.G drills and taps using counterbore drill routine and standard rigid tapping,20 of each hole size with no drill or tap wear.Dont price the the tooling

its up there but an exellent demo.

[McRae]

Has anyone Pipe Tapped this kind of Hard operation? I need to do a 1/2-NPT in Rc59 Hard Metal Chilled Cast Iron...

 

Any suggestions?? Peck Tapping not an Option.

[jeff]

Whenever we have to do threads in hard materials,we just send it out to an edm shop.

they have a sinker edm and the threads look great.

[ROB]

Andrew, can you threadmill it?

thats what i do, anything over 3/8 npt

i threadmill, works great!

specially whe doing hastalloy c-276 mat.

[Fig sign]

I used it .

You must have rigid taping option on your machine .

I did it on the hard materials but anyway the risk is high to break a tap when it is deep in

the hole .

I used the regular taping cycle ,copy it a couple of times and change depth

[mikhael gutman]

Hello!

I agree with Iskander , only addons- You have to be able orient you spindel in same position.

Regards

 

[ 11-17-2003, 08:16 AM: Message edited by: mikhael gutman ]

[Fig sign]

I use thread milling a lot for not standart thead pitchs.

In molds it is a common thing ,because of the plastic expansion you need to do theads with pitchs like m20.2*2.525 and offset -0.1:(

[Lars Christensen]

I have not tryed in steel yet, but I am running a Haas Minimill that is not apple to run peck, so the onely alternative is to the same tap with differnet depths of cut, so I did this in my post.

 

###############################################################################-LARS

pdrtre #pecktap1, before

if mi1 > 1, pwcs_2

if cstart = one, cflag = one

if drillcyc = 3, drlgsel = fsg1 (-ss1) + drillcyc * 2

else, drlgsel = fsg2 (dwell) + drillcyc * 2

if initht <> refht, drillref = 0

else, drillref = 1

z = (depth * z_mult) * 0.3333

if absinc = one, prv_zia = refht * z_mult

feed = fr_pos

pcom_moveb

pindex

if drillcyc = 3 & use_rigid = 1, result = newfs(12, feed)

else, result = newfs(9, feed)

 

pdrto #pecktap2, before

if mi1 > 1, pwcs_2

if cstart = one, cflag = one

if drillcyc = 3, drlgsel = fsg1 (-ss1) + drillcyc * 2

else, drlgsel = fsg2 (dwell) + drillcyc * 2

if initht <> refht, drillref = 0

else, drillref = 1

z = (depth * z_mult) * 0.6666

if absinc = one, prv_zia = refht * z_mult

feed = fr_pos

pcom_moveb

pindex

if drillcyc = 3 & use_rigid = 1, result = newfs(12, feed)

else, result = newfs(9, feed)

 

##################################################

 

##########################################################################-LARS

pmisc1 #Canned Misc #pecktap ,shift

pdrtre

pbld, n, *speed, *spindle, e

pbld, n, *sgdrlref, *sgdrill, pxout, pyout, pfzout, pcout, prdrlout,

pffr, e

pdrlcommona

pdrto

pbld, n, *speed, *spindle, e

pbld, n, *sgdrlref, *sgdrill, pxout, pyout, pfzout, pcout, prdrlout,

pffr, e

pdrlcommona

 

pdrlcommonb

pbld, n, *speed, *spindle, e

pbld, n, *sgdrlref, *sgdrill, pxout, pyout, pfzout, pcout, prdrlout,

pffr, e

pdrlcommona

##################################################

 

pdtap_2 #Canned Drill Cycle for pecktap-LARS

pmisc1

pspindle

if mi3 = one,

[

pbld, n, *speed, *spindle, *feed, e

]

pbld, n, pxout, pyout, pzout, pcout, prdrlout_2, dwell, e

pdrlcommona

#############################################

 

This will setup Misc1 drill cycle, dividing the depth into 3 steps........Rigid tapping has to be on.

As some of you guy's know this post editting is very new to me, so you experts are welcome to in that ordre.

But hey if there is just one out there who can use some of it, then I have been able to give insted of always recieving on this forum.

 

Lars

[Fig sign]

The question is :

What is better - to make rigid tapping of all holes to the first depth then proceed to the second and so on or to tap first hole ,then next and so on !

I found the first option better not only cause you don`t need any changes to your post ,

but because you have better control over the operation :

the first rigid tap peck is not so dangerous as the next ones ,you can do it without probs ,you can add M0 after it ,and add special coolant ,

take off chips from holes and do a lot of other things .

The backdraw of this : if the tap `ll break you will not be able to continue with other holes .

You choose what you like .

I don`t use much rigid peck tapping , I make

molds and prefare 100 % safe ways .

I am not ashamed to tell that I can finish holes by hand ,if they are 4-10 holes it will take me less then 10 minutes ,and will be far less then to EDM out the broken tap!

[Elad]

Hey,

 

I posted this question a year ago!

[Elad]

Alex,

 

Did you try to finish M16 or bigger by hand??

It is a nightmare!

[Fig sign]

Sorry ,Elad !

 

What came on me ?

I don`t know .

LOL ,LOL and LOL !

 

Anyway it was fun .

 

Iskander teh perfecto stupido

[Fig sign]

I hardly recall when I had M16 or bigger last time , but yes , I do ,cause my machine anyway not capable to do it good on steel because of a spindel load.

M16.... you take a big thingy and do it man !

 

I recall M39*4 .(threadmilling )

Whoever will buy a tape for 1 hole ?

[Lars Christensen]

Iskander,

I do not disagree with you, I also rather be safe than sorry and onely going to use this when one of these blocks comes by with 250 holes. What I also have added to my post is a Misc value that will reverse the spindel at 4000 rpm with a dwell it seems like this have a good effect clearing chips from the tool.

 

Lars

[CAM-mando]

Lars I also have a "Poormans" peck cycle. Some machines that support peck tapping have syncronization that is adequate for peck tapping, but only offer peck tapping as part of an options package. The machine is capabale but the control doesnt have the canned cycle.

 

My Hitachi mills can tap 2-56 holes 2-3 diameters in titanium using this method.

 

Also I tend to side with Lars on this. If your tap takes a poop and you are halfway done a bunch of holes you are a bit stuck.

 

[ 11-18-2003, 10:31 PM: Message edited by: CAMmando ]

[Sailing4life]

Make sure you have rigid taping option on your machine. I am doing the same as Iskander adding extra passes be hand editing. If you working with tough material use have taping oil.

Tread milling much better because you have full control of process. When setting up tread milling on first pass back of offset and than snick on it.

Good luck Alex