Tapping

[JSAussem]

I have to push a 30mm x 3.5 tap thru a block of 1018 CRS, any recommendations on speeds and feeds? I'm running a Mori Dura Vertical. I have no experience with metric taps and since this is so large I would like a second, third or fourth opinion. Right now I have it programmed for 2100.0 feed at 600 rpm.

 

Thanks

[Guest]

Roll Form, Cut tap?

 

You say through so I guess a cutting tap. How thick?

 

Are you programming the feed in MM?

 

I'd likely start a tap that size about 250 RPM with a feed of 27.55905 IPM to start.

 

That's a good size tap with a good amount of cutting pressure. at 600 I would be concerned of heating and burning the tap out.

 

Depending on the required depth I might actually think about threadmilling instead.

[JSAussem]

Thanks John,

It is a cutting tap (spiral), programming in metric and only have to go about 70mm deep.

I have not visited the forum in a while but what happened to the Patriot's logo?

 

John

[Guest]

quote:

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I have not visited the forum in a while but what happened to the Patriot's logo?

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I loaned it to Jammer for the week. He made the mistake of betting on the Steelers

 

I'll take it back out come playoff time

 

WHat kind of machine are you going to attempt this on, you will need some "power" behind it to drive that tap, you also might consider peck tapping it to break the chip, otherwise you might have some breakage issues going that deep with no chip breaking occurring.

[JSAussem]

That’s my next issue. I am running a Mori Seiki DuraVertical 5080. It’s a good size machine but I reading the manual right now to try and figure out there synchronized tapping cycle and hp range.

[Guest]

If memory serves me, I believe you can just add a Q value for peck tapping on the control for that machine

[?Mark]

It's a good size tap so my concern here is if the hp is available. It would be quite the workout for our duramill, but I'm not familiar with 5080 model (hp?)

If hp is not there, adding Q (of no more then 1 turn ) should do the trick and thankfully it's just 1018

And like John said, try to stay below 250 rpm (still worried about available torque at this rpm though )

[JSAussem]

JParis,

You have mail.

[JSAussem]

Thanks Mark!

[mike_f]

do you need to tap ? have you considered thread milling ?

[JSAussem]

I have, but the boss wants to see it(the machine) tap!

[Goldorak]

 

i will definitively try to convince my boss that treadmill is the way to go

 

-faster

-probably cheaper ,tap this seize is not cheap

-u can adjust pitch

-better finish

- and a lot more !!!!

 

 

imo

[Storkman]

threadmill, threadmill, threadmill.

[Goldorak]

+ with a tap , the piece need to be hold down very hard , you need to handle a lot more torque than a treadmill

[Thee Dragracer1951]

That's one big tap to be using in that Mori. Call me another voice for a threadmill.