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Mill Drill high speed head

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  • Mill Drill high speed head

    Sorting out some files today and came across this old layout from when I used to have a mill drill.
    The layout covers two mods, one is the conversion from manual to CNC in respect of the Z axis spindle drive.
    I must add that although I drew this up I never did convert the machine to CNC before selling it.

    Second mod covers the building of a high speed head. On small work the limited speed range of these machines isn't high enough to take advantage of very samll cutters.
    This was an add on that was able to get the speed of small cutters up to a respectable speed.
    I did build this and it worked fine. I used 'O' rings for the drive belts and small angular contact magneto type bearing in the home made cutter holder.
    The drawings shows a R8 type taper but my machine was No 3 morse.

    Although drawn up for a Mill Drill there is no reason why the design couldn't be adopted to many form of vertical mill such as a bridgy etc.
    Drawing is at :-

    John S.

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.

  • #2

    Sherline now has a 10,000 rpm kit for their spindles, and as a motor/spindle unit it is a reliable alternative.

    I use my Foredom 1/4hp flexshaft for the small stuff (20,000 rpm max - safe for 1/4"carbide and smaller) and a Air Turbine handpiece for 1/16" dental burrs at 400,000+ rpm (yeah!)

    Thanks for the ideas - they are always of note.


    • #3
      One of our guys that does luthier work made a mounting bracket for a 1/2" router to go on the quill of his M/D. He said for the use he put it to worked just fine.
      Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.


      • #4
        I made an adapter plate for a little trim router and used it on my tabletop CNC to cut wood. Worked much better than the 5000RPM of the Prolight mill. Used it to cut 3-D "victorian" corner blocks for window and door trim.


        • #5


          You can't use the term "Victorian and CNC" together - I am sure the woodwright in old Willamsburg had a "CNC Adze" too.

          I'll save a warm spot for you beside me in woodworker's hell...


          • #6
            Even worse I showed "the little woman" ho to operate the machine.
            The beauty of hell is, all my friends will be there.
            The reason for the project was to be able to trim the house in clear pine with an oiled finish. Is it "Victorian"? Hell no. Is in a nice addition to the house? You Betcha. Is she proud of her acheivement? Cant get her to shut up about it. The ball and chain also fit all the trim and used "her" biscuit tool for all the joints. When the "little hen" goes to work the other nurses talk about their new knitting needles and she talks about her new 13 inch planer.


            • #7

              A friend of mine met this woman and was trying to impress her with his mechanical skills - she got pissed off and told him to get the hell out of the shop so she could fix the damn thing in peace. Now he only claims financial superiority over her, but is quite proud of his "handy-gal" and her 24'x48' workshop behind her house (she built both).

              Nothing quite like a woman with her own workshop full of power tools! (oooh! oooh! oooh?)