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Thread: Brilliant Tapping Trick on the lathe or mill

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    Supporting Member anthonyget's Avatar
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    anthonyget's Tools

    Brilliant Tapping Trick on the lathe or mill

    Many of you will know this trick, but I only learned it recently. I read about it in an article or letter in Model Engineer's Workshop magazine and had to try it. I was sick to death of breaking taps and this is a fantastic way of not breaking taps and getting a perfect thread every time.


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    Altair (09-29-2020), Carnel (09-23-2020), Corm (09-23-2020), H.L (09-23-2020), Home-PC (09-23-2020), Jon (10-14-2020), nova_robotics (09-22-2020), Scotty12 (09-22-2020), Sleykin (09-22-2020), trigger (09-27-2020)

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    hemmjo's Tools
    That is a very good idea. The De-Speeder as shown may be difficult to find. But most everyone as an old rechargeable drill. I have collected at least 5 in a box from over the years. All of the ones I have use planetary gears to "de-speed" the little high speed motor and multiply torque for the drill. While it would take a little modification to make one into a tapping tool as show, all the important parts you need are there.

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    Sleykin (09-22-2020)

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    Sleykin's Tools
    IIRC the de-speeders were intended so you could use an OG drill for running screws in. Before variable speed reversible drills. I think I have one around here with 2 rings on it. one makes it go forward and the other backs it off.
    I also have a couple tapping heads for the drill press and mill, might work well on the lathe too?

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    Supporting Member anthonyget's Avatar
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    anthonyget's Tools
    Thanks hemmjo. They do come up on Ebay quite regularly, at least here in the UK, but I always assumed, maybe wrongly that Rawlplug was a US company. Also, your idea sounds very sound.

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    Supporting Member anthonyget's Avatar
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    anthonyget's Tools
    Quote Originally Posted by Sleykin View Post
    IIRC the de-speeders were intended so you could use an OG drill for running screws in. Before variable speed reversible drills. I think I have one around here with 2 rings on it. one makes it go forward and the other backs it off.
    I also have a couple tapping heads for the drill press and mill, might work well on the lathe too?
    Thanks for explaining. I will add your info to my video's description if that's ok.

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    Sleykin (09-23-2020)

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    Sleykin's Tools
    Sure... although that is just my memory. I know I used them for screws before I had the VSR drill.

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    Thanks anthonyget! We've added your Lathe Tapping Technique to our Machining category,
    as well as to your builder page: anthonyget's Homemade Tools. Your receipt:





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