depth for taps

[RYANDUC]

hi some body

i need help ,how to calculated the depth for

any taps like NC,NFS or NPT .THANKS

[BernieT]

Machinery's Handbook should have all the thread info you need.

[HevyMetl]

Like bernie alluded to there is no one way to calculate it. Cleveland Twist has a great quick reference chart for drills, taps, and reamers. Contact your local distributor and he can probably get you one. If you need specific information today, just ask the specific question.

[n_tydingco]

quote:

---

how to calculated the depth for

any taps

---

Do you mean calculate the feedrate for the taps? Depths should be specified on your print.

[Gary]

1.5* dia min for steel 2 for cast ect and 3 for aluminum is this what you meant. Usually 5 x pitch plus depth you need plus .12 for chip clearance is what I was taught. 5 x pitch is because regular taps have 5 imperfect threads on the bottom. hth

[RYANDUC]

hi Gary

i still don 't get it, please explant more about that.thanks

[Thad]

A 1/2-13 tap should have .75 minimum thread because .5 X 1.5 = .75

 

Take your thread OD and multiply it by 1.5. That will be your minimum depth of thread for steel.

 

Thad

[RYANDUC]

Hi Thad

now get it , how about NPT .thanks

[Matthew]

You should use a thread depth gauge for NPT threads, but general rule of thumb (that I was taught and used to use until I bought a gauge) is three full turns of the fitting by hand. I find it's usually about 3/4 of the way up the tap, but that can vary depending on where you buy the tap from.

[connormac]

I know that NPT thread gages have a ground place that you go to. Also I was told and used the same method as Matt. Three full turns with fitting.

[Mike Mattera - TFM]

1.5 x dia + 3 x the pitch (lead threads).

 

Add 2-3 more thread leads plus the drill tip distance for the drill depth.

 

Then Make A Tapping Library. Because Your Going To Do It Ther Same Way Everytime.

 

Mike Mattera