How to drill a square hole?

[Anthony KnightsParticipant @anthonyknights16741]

As a mere beginner at this game I wasn’t aware one could obtain hexagon bar which could be hardened enoungh to use as a cutting tool. The idea of using hexagon bar to make the cutter is amazing and just goes to show the ingenuity of the people involved in engineering. Is there any information available regarding the size of cutter in relation to the hole required, or is it all down to the drilling guide (jig or whatever is the correct terminology).

[Ian AbbottParticipant @ianabbott31222]

Can’t remember what I was told about the cutting tips.  One could braze on a harder material I guess, then harden & temper.  The one in the photo looked like the bar cut away on the mill, with no additions.  I remember that he couldn’t get hexagon in anything but mild steel.

 

Ian 

[jacques maurelParticipant @jacquesmaurel42310]

I’ve turned the solid of equal width between centers, the process is thoroughly discribed in ME N°4285.

[Anthony KnightsParticipant @anthonyknights16741]

Bonjour Jacques,

                                unfortunately. having only recently become involved  in mechanical engineering (having spent most of my working life in electronics) I do not have access to a copy of M.E.No.4285.

[Author]

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