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wrote in news:1119705063.093562.181590
@g47g2000cwa.googlegroups.com:

I am building a jig to drill and tap a series of holes. In operation,
the jig will have slip fit style drill bushings. I will drill the
pilot hole, then run a tap thru the hole. I was planning to use a
drill bushing that fits the thread cutting end of the tap, but don't
have all the taps that I am going to need yet, so I do not have a way
to check what size of drill bushing will fit the tap properly. The
sizes I will be using a
5x40 & 6x40.

Does anyone know of a formula, or real world answer to this question?
TIA, ron

Be aware that the tap drill for the screw will be smaller than the tap,
so if you use bushings that allow the tap to go through, they will be
loose on the drill. This leads to the question: Are you using the
bushings to locate the holes, or are you using them to make sure the tap
is square to the material? You can't have both without changing
bushings.

--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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