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Thread: Anyone know a machine shop that can drill out a 7/8-14 and tap for 1-1/4-12 ?

  1. #1
    Boolit Master
    Join Date
    Feb 2007
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    South West Ohio
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    Anyone know a machine shop that can drill out a 7/8-14 and tap for 1-1/4-12 ?

    I have a Redding T-7 toolhead that I would like drilled out from its 7/8-14 and tapped to the larger 1-14"-12 size. I saw one that was done years ago and there was enough meat to do it.

    I know any machine shot could do it but if anyone knows one that already has the drills and taps for it, it would likely be much less expensive. I'd rather not but a very expensive drill and tap for one project....but I will if I have to.

    Please let me know...I'm not sure if I should put this in gunsmithing as well.
    The good thing about science is that it's true no matter if you believe it or not. (Neil DeGrasse Tyson)

    I was scolding my 5-year old for her and her friends making a giant mess in her room. She said they all did it. So I asked her: If all her friends jumped off a cliff, would she do it too? She said, "Oh no daddy! I would go to the bottom and try to catch them! They're my friends." Man, either I have a great kid or she has a stupid father.

  2. #2
    Boolit Mold
    Join Date
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    Where are you located in SW Ohio ?

  3. #3
    Boolit Master

    Join Date
    Mar 2013
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    It is not a hard job to do. The big thing is maintaining alighnment. I believe instead of drilling out to tap dril size I would bore it to size. This would require less force and have less chance of cracks or distortions in the part.

    The best way is to call around to various shops and see what they can do and are willing to do. Look at shops that specialize in bigger work and heavy equipment rebuilds they may have the tap drill and tap on hand. A lot of shops stock up to 1" taps and tap drills any thing bigger s purchased as needed for the job and charged to it. One that does the bigger work should have them in stock.
    Another place to look is the local trade school or community college that offers the apprenticeship courses. They have shops and students willing to do odd jobs. You may have to by the tap but they can set it up bore it to tap drill size.

  4. #4
    Boolit Master
    Join Date
    Feb 2007
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    Between Cincy and Dayton
    The good thing about science is that it's true no matter if you believe it or not. (Neil DeGrasse Tyson)

    I was scolding my 5-year old for her and her friends making a giant mess in her room. She said they all did it. So I asked her: If all her friends jumped off a cliff, would she do it too? She said, "Oh no daddy! I would go to the bottom and try to catch them! They're my friends." Man, either I have a great kid or she has a stupid father.

  5. #5
    Boolit Master
    Join Date
    Mar 2005
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    3,554
    It would be about as easy to get another piece of steel and put 2 holes in it with a mill.
    EDG

  6. #6
    Boolit Master

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    Quote Originally Posted by AbitNutz View Post
    Between Cincy and Dayton
    I used to have a machine shop in Mount Healthy right on 127. I could have done it easily.

    Too bad it's not 1981.
    "Varium et mutabile semper femina." - Virgil
    Man, ain't it the truth....

  7. #7
    Boolit Bub
    Join Date
    Aug 2014
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    34
    Better yet would be to bore and thread mill. Taps aren't all that accurate but thread milling will insure straight concentric and true threads in line with the bore. Any machineshop with CNC can do it and they don't need to have any special tool for that thread and diameter. I've done a bunch of threadmilling with my CNC knee mill. Works great and you can do metric, oddball russian and japanese threads etc. Its a really neat way of doing things especially in sizes that take a lot of horsepower to run.
    I'm not too far from Dayton in Indiana....west of Richmond. PM if you can't find anyone to do it.
    Frank

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