Ajax/Bridgeport look alike universal mill

[Tony MartinsParticipant @tonymartins59025]

Hello

Is there anyone out there that has an exploded or dimensional drawing of a self releasing manual drawbar (no hitting with a hammer) as fitted to a 44 year old Ajax/Bridgeport lookalike universal mill that will enable me to machine a new one for my mill??

Any help will be much appreciated.

Thanks Tony

 

[DC31kParticipant @dc31k]

You can almost guess at a concept that would work.

You need a longer/deeper than normal hexagon on the drawbar top, with a flange below that.

Over that you secure a top-hat cover, with a hole in its top to suit the across points dimension of the hexagon.

As you unwind the drawbar, the flange rises, contacts the underside of the top hat cover, rises no further and instead pushes the tool out of the taper.

You have to experiment with dimensions so, for instance, the internal drive key of an R8 taper would engage before the drawbar tops out (you do not want to be forced to start screwing the drawbar in before the key is engaged or you might misalign it).

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