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IndustryArena Forum > MetalWorking Machines > Bridgeport Machines > Bridgeport / Hardinge Mills > Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues
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  1. #1
    Join Date
    Nov 2019
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    9

    Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Hi,

    I'm new to this forum. Just bought my first CNC mill which is a Bridgeport Interact Series 1. I'm just getting my head around the cycles which the machine has in it's TNC145 control.

    At the moment I'm trying to get the tapping cycle working successfully, though I keep stripping the thread as the tool is retracted. I'm using a M8 x 1.25 spiral flute tap on an aluminium plate. I'm using a feedrate of 625mm/min, spindle speed 500RPM and dwell time 0sec. The thread seems to be cutting okay as the spindle plunges into the workpiece (clockwise), though then dwells for 1 second with the spindle rotating before the spindle is automatically reversed and the tap is retracted at the same federate and spindle rpm.

    Is there a way to remove this 1 second dwell between spindle rotations? I feel this is causing the thread to be stripped out....

    Thanks,
    Ben

  2. #2
    Join Date
    May 2016
    Posts
    526

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    How are you holding the tap

  3. #3
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    I have the tap rigidly mounted in a QC30 tool holder

  4. #4
    Join Date
    May 2016
    Posts
    526

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    There is no rigid tapping on that machine change to a floating tapping head and will solve problem the dwell allows for the spindle to stop and reverse

  5. #5
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Though when the z-axis 'dwells' for a second the spindle is still spinning clockwise. Would a floating tapping head prevent the threads from stripping when the z-axis is stationary and the spindle is still spinning clockwise?

  6. #6
    Join Date
    May 2016
    Posts
    526

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Yes as the spindle slows the head allows the tap to float down a couple of mm's and on retraction it starts lifting up preventing threads stripping

  7. #7
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Great thanks! Would you be able to recommend a certain type of floating head for the Bridgeport interact QC30 toolholder?

  8. #8
    Join Date
    May 2016
    Posts
    526

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    You may be able to get away with spring loaded collets dependant on speeds and tap size
    Where are you based

  9. #9
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Bristol

  10. #10
    Join Date
    May 2016
    Posts
    526

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Message me your email or phone number and I'll send you a pic as I'm in Kent

  11. #11
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues


  12. #12
    Join Date
    Aug 2009
    Posts
    1566

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    ..Hi All,

    I was reading your thread and went looking for an example of a Floating Tap holder QC30 type. I don't think anyone makes them but, I did discover something interestingly new to me about CNC Tooling available these days (for a price)...so I will pass it on as more options for ya.
    https://www.cncshop.com/us_en/er32-f...ap-collet.html

    happy hunting,
    DJ

  13. #13
    Join Date
    Nov 2019
    Posts
    9

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    Thanks DJ! Yeah comes at a price :/ was hoping to find a cheaper solution.....

  14. #14
    Join Date
    Jan 2005
    Posts
    1121

    Re: Bridgeport Interact Series 1 - TNC145 Tapping Cycle Issues

    AFAIK an interact 1 145 not only does not do rigid tapping in any way, it does not reverse the spindle. YOu have a switch that must be fwd or rev no? varispeed head with air speed change?

  15. #15
    Join Date
    Nov 2019
    Posts
    9
    Quote Originally Posted by gus View Post
    AFAIK an interact 1 145 not only does not do rigid tapping in any way, it does not reverse the spindle. YOu have a switch that must be fwd or rev no? varispeed head with air speed change?
    Well mine certainly does :/ is part of the standard tapping cycle. Spindle plunges clockwise, dwells for a second, reverses and retracts anti-clockwise?!

    Yes there’s a switch on the spindle control for high and low speed. If you select low speed when the gearbox is in high speed it will spin in reverse and visa versa. Yeah has the airspeed change.

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