old Carlton radial drill spindle notches
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  1. #1
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    Default old Carlton radial drill spindle notches

    Im working on getting my 1930 Carlton radial drill going, and was wondering about the spindle. It has #4 morse taper, second slot for a keeper, but what were the two notches (cutouts like for keystock) at the bottom of the spindle used for? I havent found any pictures of any morse taper arbor that drove with those notches. Enlighten me on how they were used. TIA

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    You could buy MT to NMBT adapters to plug into your HBM taper from Scully Jones circa 1942. Possibly Carlton had something similar - but earlier in mind. NMTB were standardized on milling machines in about '27. Two face keys in the notches

    Great for face mills

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    I was just looking at some old literature where they were boring with a radial drill, and using morse taper extensions. I bet the notch was to allow the use of a wedge to knock the arbor loose from the extension.

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    well, tried a 4 to 5 morse taper adapter, but no need for the notch. But did look just right for two driving keys like was previously suggested.

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    My Carlton has the spindle nose made like my G&L it is designed for MT tooling that had flats on each side for delivering torque much like how a mill spindle keys works. This kept from shearing the MT tang in high torque operations.


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