Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: thread tapping

  1. #1
    300+ Forum Addict


    tiburon's Avatar
    Join Date
    May 2007
    Location
    Amsterdam
    Posts
    353
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    thread tapping

    Hi,

    I hope someone here can give me a crash course on thread tapping. I have to tap my Simworld knobs and I borrowed this utterly crappy tap and die set from a friend. I drilled a 3,2mm hole for a 4 mm tap and screwed the M4 x 7 (?) tap through. But, the M4 set screw didn't fit. It was too small and just fell through the hole.
    So that was one knob (half) ruined and before I ruin any more of them I thought I'd ask if anybody knew what could have gone wrong.
    Thanks in advance.

    Martin

  2. #2
    500+ This must be a daytime job
    Join Date
    Jul 2013
    Posts
    948
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Either the tap is wrong or the grub screw is not 4mm. Test both the tap and grub screw with a 4mm nut and see which is correct.
    Probably find that the grub screw is actually 3mm

    David

  3. #3
    300+ Forum Addict


    tiburon's Avatar
    Join Date
    May 2007
    Location
    Amsterdam
    Posts
    353
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    No, the grub screw is M4, the tap however doesn't fit in a M4 nut. Must be the crappy quality.
    Is there anybody in the Netherlands who would be kind enough to help me tap those knobs ?
    I can't afford a better quality set at the moment.

  4. #4
    150+ Forum Groupie riche543's Avatar
    Join Date
    May 2008
    Location
    Sydney Australia
    Posts
    264
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Sounds like wrong tap , metric or imperial or wrong pitch ( thread spacing ) is there a pitch gauge with the tap & die set. If so you check pitch on grub & pitch on tap.
    Good luck.
    Riche.
    I Started with Nothing & ive still got loads left..

  5. #5
    300+ Forum Addict


    tiburon's Avatar
    Join Date
    May 2007
    Location
    Amsterdam
    Posts
    353
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Is it possible to screw up the tapping ? (pun intended) I mean, the hole I've made is wider at the beginning then at the bottom, where the grub screw almost fits. Sorry to keep asking but I don't want to mess up any more expensive knobs.

  6. #6
    500+ This must be a daytime job
    Join Date
    Jul 2013
    Posts
    948
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    There are three stages of taps. Taper - used to easily start the tap, Middle and then End tap used for blind holes.
    If the grub screw "fell through" the hole and the grub screw fits a 4mm nut then the tap must be wrong. Even if you "screwed up" when using the tap, it should not let the grub screw "fall through"

    Just in case the knob material was so soft that the tap cut a hole rather than a thread, try it out on another material eg aluminium, making sure that you use some oil and reverse the tap to break the chips.

    David

  7. #7
    300+ Forum Addict


    tiburon's Avatar
    Join Date
    May 2007
    Location
    Amsterdam
    Posts
    353
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Thanks David. The material is of course resin which is pretty soft. the tap set I have has 2 M4 taps that are marked M4x0,7 and 4x0,75. There's no taper and they have pointy ends so I guess this is the middle variety. I'll try your suggestion and make some holes in aluminium.

  8. #8
    MyCockpit Support Staff


    Westozy's Avatar
    Join Date
    Nov 2005
    Location
    Perth, Western Australia
    Posts
    1,488
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    All good advice guys cheers!

    Here is a great metric thread tapping chart - http://www.engineersedge.com/manufac...rill-chart.htm
    It is important to use the right tapping drill. In your case 3.3mm or 1/8" is the right drill, it will do for both M4x0.7 and M4x0.75 in resin. This is the same thread I use in all of my Boeing and Airbus range of replica knobs!

    Cheers Gwyn (Westozy)
    Aerosim Solutions

    737NG using Prosim737, Immersive Calibration Pro, Aerosim Solutions motorized TQ & cockpit hardware, CP Flight MCP & FDS SYS1X, SYS2X & SYS4X, FDS PRO FMCs, AFDS units & Glarewings, Matrix Orbital ELEC display, Pokeys Landing & Cruise alt display, Buttkicker Gamers, 3 x BenqMW811ST projectors with a Matrox Th2Go
    http://www.aerosimsolutions.com.au
    Supporter of MyCockpit.org, please join me in donating!!!

  9. #9
    300+ Forum Addict


    tiburon's Avatar
    Join Date
    May 2007
    Location
    Amsterdam
    Posts
    353
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Thanks Gwyn.
    Am I right in thinking that 4 x 0,7 is the most widely used for metric threads ?
    I found a supplier who sells separate taps so I can order a good quality one.

  10. #10
    MyCockpit Support Staff


    Westozy's Avatar
    Join Date
    Nov 2005
    Location
    Perth, Western Australia
    Posts
    1,488
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: thread tapping

    Quote Originally Posted by tiburon View Post
    Thanks Gwyn.
    Am I right in thinking that 4 x 0,7 is the most widely used for metric threads ?
    I found a supplier who sells separate taps so I can order a good quality one.
    I buy the knob grub screws in bags of 100 on Ebay, I have both taps in my set but can't remember which one it is, I'll have a look when I get home and get back to you on this!

    Cheers Gwyn

    737NG using Prosim737, Immersive Calibration Pro, Aerosim Solutions motorized TQ & cockpit hardware, CP Flight MCP & FDS SYS1X, SYS2X & SYS4X, FDS PRO FMCs, AFDS units & Glarewings, Matrix Orbital ELEC display, Pokeys Landing & Cruise alt display, Buttkicker Gamers, 3 x BenqMW811ST projectors with a Matrox Th2Go
    http://www.aerosimsolutions.com.au
    Supporter of MyCockpit.org, please join me in donating!!!

Page 1 of 2 12 LastLast