587,998 active members*
1,468 visitors online*
Register for free
Login
Results 1 to 9 of 9
  1. #1
    Join Date
    Jan 2005
    Posts
    29

    tapping 303 stainless

    having trouble tapping 1/4-20 blind holes in 303 stainless Using flood water based coolant floating tap holder. can anyone help speeds ? Oil?

    thanks

  2. #2
    Join Date
    Apr 2003
    Posts
    1876
    Can you use form (roll) taps? They're stonger, and make stronger threads.

    If not, try running the hole up to like .204ish (if it's for you, and not critical, you could go up a bit more on the hole dia and reduce stress on the tap), and yes, use tapping oil.
    Matt
    San Diego, Ca

    ___ o o o_
    [l_,[_____],
    l---L - □lllllll□-
    ( )_) ( )_)--)_)

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #3
    Join Date
    Jan 2005
    Posts
    51
    You need to use a tin coated bottoming tap and try around 20sfm.
    I would use a #5 drill ,put tap free oil in the hole. If thats to slow and you have a lot of holes to do then put twice as much oil in you water. Another thing are you using ridged tapping on machine? If your not and you have it use it. Try these speeds and feeds Speed 305 rpm's Feed 15.25 IPM and dwell in the bottom of the hole(G04 P300). If your still breaking taps then go up to around .208-.21 on your hole size. I tap stainless a good bit and i allways do pretty good on it.

    Thanks
    smallplanes

  4. #4
    Join Date
    Jan 2005
    Posts
    29

    Ridgid holder

    Thanks for the quick help Ridgid tapping with a floating holder or a fixed holder? Just wondering if you meant just the gcode setting. I don't have a seperate cooling pump just fill the holes? leave cooling off? thanks
    again.

  5. #5
    Join Date
    Jan 2005
    Posts
    51
    Well i meant use a M29S305(thats the machine code for riged tapping on my machine). I tap in a riged holder using riged tap on machine cycle. You can use your coolant pump you just need a lot of solubale oil mixed with water. But i have to say the tapping oil works best its just slow to do. I run Mori Seiki machines and they have Fanuc controls on them and the tapping code is writin like this

    G90G0G54X0.Y0.M8
    G43Z.5H1
    M29S305
    G98G84Z-.5R.01P300F15.25
    G80M9

    Thanks and i hope this helps
    smallplanes

  6. #6
    Join Date
    Mar 2005
    Posts
    988
    Tapping 303 shouldn't be any real hassle... even with coolant. I think you need to ditch the floating holder though and go rigid ( ER collet or similar ). Unless your machine requires the use of a floating holder for tapping.

    Like mentioned before, a good coated tap will work wonders. If you're doing a blind hole, make sure you have good drill depth for chip clearance when using a gun tap (regular tap ). Otherwise, go with a roll tap or a spiral fluted tap.

    I tap a lot of SS and I tend to use Vegataps alot. I tap 300 series at 120sf with coolant and 400 series at 120sf with some moly dee. Your question was a bit vague on the details so I hope this helps.
    :cheers:


    Hey Rekd... I'm feeling a sense of deja-vu here...

  7. #7
    Join Date
    Apr 2003
    Posts
    1876
    Quote Originally Posted by psychomill
    ...

    Hey Rekd... I'm feeling a sense of deja-vu here...
    Matt
    San Diego, Ca

    ___ o o o_
    [l_,[_____],
    l---L - □lllllll□-
    ( )_) ( )_)--)_)

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  8. #8
    Join Date
    Jan 2005
    Posts
    8
    I've found using cutting oil from pipe thread machines, also works great on chewy material. When I tap SS/chewy material I use a straight bottom tap, Spiral taps
    don't work very well
    I stop the cycle and apply oil with a hand sprayer on the tap and in the hole before taping the hole

  9. #9
    Join Date
    Mar 2005
    Posts
    32
    I have a little trick for applying oil to my tap before tapping the hole.

    I just put a cup of oil somewhere on my table, and tape it down so it doesn't tip over during rapid moves.

    Then I write a sub that moves the tool to my cup, and dips the tap in it.

    I call the sub. Then tap a hole (or more if I can get away with it).

    Saves me from having to stand in front of the machine with tapping oil.

Similar Threads

  1. Problem Tapping Stainless
    By bobcor in forum Uncategorised MetalWorking Machines
    Replies: 16
    Last Post: 04-21-2008, 08:35 PM
  2. Tapping head any good?
    By kong in forum MetalWork Discussion
    Replies: 6
    Last Post: 04-19-2005, 09:49 PM
  3. Rigid tapping on a BPT TC1G w DX32 control
    By machintek in forum Bridgeport / Hardinge Mills
    Replies: 0
    Last Post: 01-02-2005, 02:06 AM
  4. tapping
    By cncshawn in forum DNC Problems and Solutions
    Replies: 1
    Last Post: 12-28-2004, 12:47 AM
  5. Tapping
    By MPE racing in forum Uncategorised CAM Discussion
    Replies: 9
    Last Post: 11-06-2004, 07:42 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •